https://astrotube.obspm.fr/about/instance/homehttps://astrotube.obspm.fr/videos/browse?scope=localhttps://astrotube.obspm.fr/w/ksJ5sPTrovSKjqfdN7ueAWhttps://astrotube.obspm.fr/lazy-static/thumbnails/5aabf329-e825-44b2-a399-498f2280d31c.jpgEclipse11juin21Timelapse de l'éclipse partielle de soleil du 11 juin 2021 depuis mon jardin à Sèvres. (Canon EOS 30D + objectif Nikon de 500 + filtre solaire). Pas mal de passages nuageux...https://astrotube.obspm.fr/static/streaming-playlists/hls/9d98e744-ea3b-4ad6-94a5-47f3ffc0363e/49fba053-8685-428d-8dc0-382ec52b2cf5-master.m3u8https://astrotube.obspm.fr/videos/embed/ksJ5sPTrovSKjqfdN7ueAW225352021-06-18T12:43:40.286ZYESMain rouan channelNOhttps://astrotube.obspm.fr/w/soa5wU9a1QumUhaS7VjPEkhttps://astrotube.obspm.fr/lazy-static/thumbnails/a9407cd8-1e38-4e43-872a-eb9649ecec8a.jpgSF2A_2021_extractTalk at SF2A week 2021, SKA & precursors session.https://astrotube.obspm.fr/static/streaming-playlists/hls/d5a5900d-b03b-4604-8851-273e67c3de2b/1d8d19f7-716f-4065-9066-6caa4bb22ff2-master.m3u8https://astrotube.obspm.fr/videos/embed/soa5wU9a1QumUhaS7VjPEk6520192021-06-18T21:22:25.701ZradiostronomySKAenergyradiotelescopeSF2AYESMain bcensier channelNOhttps://astrotube.obspm.fr/w/cyqzBPkPMzWSKxqHDrqw6Fhttps://astrotube.obspm.fr/lazy-static/thumbnails/1878d390-b9ce-4e86-a18a-63264ea8dae9.jpgPrésentation du pôle spatial CENSUS de PSL (webinaire CurieSat - CENSUS)Présentation du pôle spatial CENSUS de PSL (webinaire CurieSat - CENSUS)https://astrotube.obspm.fr/static/streaming-playlists/hls/5d9b793f-7051-4a77-85f7-29d4fa1ba731/7bed6bf7-d478-4ab8-9805-f1cef01d6401-master.m3u8https://astrotube.obspm.fr/videos/embed/cyqzBPkPMzWSKxqHDrqw6F32050262021-09-16T13:49:49.307ZYESMain bsegret channelNOhttps://astrotube.obspm.fr/w/vcnvZg5Vx39siFVQAbFt1Zhttps://astrotube.obspm.fr/lazy-static/thumbnails/574718e8-38a5-46ac-89b1-af883358fe48.jpggitlab-avancé_PADCgitlab-avancé_PADChttps://astrotube.obspm.fr/static/streaming-playlists/hls/ec6f7683-951b-43b6-9c5d-11e8e445227d/eaa9aa6e-a6c2-4214-833c-6376042535be-master.m3u8https://astrotube.obspm.fr/videos/embed/vcnvZg5Vx39siFVQAbFt1Z53090472021-09-28T12:47:10.874ZYESMain lesidaner channelNOhttps://astrotube.obspm.fr/w/3j9P8HP3rvc1WPEto76GGthttps://astrotube.obspm.fr/lazy-static/thumbnails/cfdfa237-790e-4219-8bdb-a9c66c01ca53.jpgA demo of the Artemix and Yafits web applicationsA demonstration by Philippe Salomé of the features provided by the Artemix and Yafits web applications based on a use case https://astrotube.obspm.fr/static/streaming-playlists/hls/12bb189e-1821-404f-b9e2-ae9665c56e73/5b12d239-8d49-43a5-8ee6-518cde88ec05-master.m3u8https://astrotube.obspm.fr/videos/embed/3j9P8HP3rvc1WPEto76GGt1280432021-10-20T08:59:23.457ZYESYafitsNOhttps://astrotube.obspm.fr/w/5UpHEnfrrmzqV2XM5g2Np3https://astrotube.obspm.fr/lazy-static/thumbnails/1d90f3e0-7646-442d-a121-4d880f41f39b.jpgA demo of Yafits in 2D modeA demo of Yafits in 2D modehttps://astrotube.obspm.fr/static/streaming-playlists/hls/27b5d8fc-7c2e-41d7-bd09-d57835533c08/8ab855a8-ebc8-4227-94b7-d7e84c051a6f-master.m3u8https://astrotube.obspm.fr/videos/embed/5UpHEnfrrmzqV2XM5g2Np3193042021-11-05T16:10:48.251ZRadioastronomyYAFITSALMAYESYafitsNOhttps://astrotube.obspm.fr/w/62ugXkmt6JouGgpgJJ7D51https://astrotube.obspm.fr/lazy-static/thumbnails/6a3150d1-7078-42ae-94d5-d8a0aecfcec1.jpgHow to use SAMP features in YafitsHow to use SAMP features in Yafitshttps://astrotube.obspm.fr/static/streaming-playlists/hls/28b2dcb9-2e2d-4180-a89f-83654c64e32c/c39dbc06-06e4-4cdb-931c-a44e3f703e3f-master.m3u8https://astrotube.obspm.fr/videos/embed/62ugXkmt6JouGgpgJJ7D5161032021-11-05T16:15:05.327ZRadioastronomyALMAYAFITSYESYafitsNOhttps://astrotube.obspm.fr/w/7H5P6QFtXM8BZWPt63o4o4https://astrotube.obspm.fr/lazy-static/thumbnails/dc255c22-ff3e-4981-9cc4-cfb4e2e94c1a.jpgA demo of Yafits in 3D modeA demo of Yafits in 3D modehttps://astrotube.obspm.fr/static/streaming-playlists/hls/36534ac5-c13c-462a-ba9c-5c65667a7c5b/b1863681-b0a6-4336-a9be-0711d156fa44-master.m3u8https://astrotube.obspm.fr/videos/embed/7H5P6QFtXM8BZWPt63o4o4340122021-11-22T10:52:12.123ZYESYafitsNOhttps://astrotube.obspm.fr/w/5vP56VtCzPZZ3tEh5YmdH9https://astrotube.obspm.fr/lazy-static/thumbnails/87634998-07ac-4d35-861b-4b51f15edeea.jpgVœux pour l'année 2022 - Observatoire de ParisVoeux vidéo Observatoire de Parishttps://astrotube.obspm.fr/static/streaming-playlists/hls/248e21e0-bd12-490d-b736-37494b1f0222/233df128-3228-4374-98fb-aafb5cd30ef9-master.m3u8https://astrotube.obspm.fr/videos/embed/5vP56VtCzPZZ3tEh5YmdH9900262022-01-12T15:37:16.470ZYESMain balbert channelNOhttps://astrotube.obspm.fr/w/scbURF719abmJabf54MWeJhttps://astrotube.obspm.fr/lazy-static/thumbnails/6dad80e9-6f6f-4107-8c7d-3867626b631c.jpgNicolas Aunai, 30 septembre 2021Nicolas Aunai, "Towards Global Simulation and Observation of Magnetic Reconnection in the Magnetosphere of the Earth", 30 septembre 2021https://astrotube.obspm.fr/static/streaming-playlists/hls/d41d82ce-d3d6-44cc-97e5-755fe544fcec/ae99c51e-ae6d-4d98-ba87-aa47d588860d-master.m3u8https://astrotube.obspm.fr/videos/embed/scbURF719abmJabf54MWeJ3224062022-04-19T14:15:22.311ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/k8FQorAChtfkTXbj7kDjAShttps://astrotube.obspm.fr/lazy-static/thumbnails/57f42f27-0f16-49fe-abe4-c80754a5a5b4.jpgEnrico Peretti, 14 octobre 2021Enrico Peretti, "Star forming galaxies as cosmic ray factories : a multi-messenger view", 14 octobre 2021https://astrotube.obspm.fr/static/streaming-playlists/hls/9af063c0-f515-4f86-a385-130ee1c280a6/018fa904-871c-4cea-942b-334247f10c7b-master.m3u8https://astrotube.obspm.fr/videos/embed/k8FQorAChtfkTXbj7kDjAS4193052022-04-19T14:48:35.524ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/stA1e12Wkaa7QQaHzQJMcjhttps://astrotube.obspm.fr/lazy-static/thumbnails/2336e38e-377b-4f21-be2f-912eb0477231.jpgDimitrios Giannios, 21 octobre 2021Dimitrios Giannios, "Neutron star mergers : the light after the gravitational waves", 21 octobre 2021https://astrotube.obspm.fr/static/streaming-playlists/hls/d667a47f-d9e1-432a-a74a-09f64b0b97d4/dfe9f660-5c26-4464-bd80-2c46656740e3-master.m3u8https://astrotube.obspm.fr/videos/embed/stA1e12Wkaa7QQaHzQJMcj3459022022-04-19T15:06:19.216ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/cL5iMtyGZhSnd2WRovaHC7https://astrotube.obspm.fr/lazy-static/thumbnails/ab1e147d-d699-4e83-b0fe-fa0ae199cee3.jpgChristian Fendt, 18 novembre 2021Christian Fendt, "Launching of astrophysical jets", 18 novembre 2021https://astrotube.obspm.fr/static/streaming-playlists/hls/5f3be7ba-843d-4b43-8ead-bc014127ab2a/ecbb6be1-eae8-4e73-8f11-d2c52011c1d1-master.m3u8https://astrotube.obspm.fr/videos/embed/cL5iMtyGZhSnd2WRovaHC74136022022-04-19T15:31:13.662ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/hftzwtifmkYFFLrWFiJUqnhttps://astrotube.obspm.fr/lazy-static/thumbnails/d61e7a86-b68e-4473-9fe7-42ea48195b1e.jpgAnna Watts, 25 novembre 2021Anna Watts, "A NICER view of neutron stars", 25 novembre 2021https://astrotube.obspm.fr/static/streaming-playlists/hls/8397a07c-8eb2-4749-9c41-58271d29cad5/a561068c-dd75-4608-a600-38fd23b071a0-master.m3u8https://astrotube.obspm.fr/videos/embed/hftzwtifmkYFFLrWFiJUqn2906042022-04-19T15:49:29.908ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/39E8hnRWSVDEVVYj2xSemAhttps://astrotube.obspm.fr/lazy-static/thumbnails/6efa74b9-5d4c-495f-b30c-bad9d6495a77.jpgMichelle Tsirou, 9 décembre 2021Michelle Tsirou, "The flaring behaviour of the Crab pulsar wind nebula in high-energy gamma-rays : signatures originating from lepton acceleration in pulsar winds", 9 décembre 2021https://astrotube.obspm.fr/static/streaming-playlists/hls/1167b922-f8c5-4551-963e-aaf7cf35f95e/2a22be65-8730-46e7-b745-f52d2f3329b3-master.m3u8https://astrotube.obspm.fr/videos/embed/39E8hnRWSVDEVVYj2xSemA44750132022-04-19T16:37:50.264ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/uKHV8Z8rmwzGP5NPP7BJpYhttps://astrotube.obspm.fr/lazy-static/thumbnails/55a20a00-6299-4843-a3ee-c5b3f69712a3.jpgVincent Tatischeff,13 janvier 2022Vincent Tatischeff, "On the origin of Galactic cosmic rays", 13 janvier 2022https://astrotube.obspm.fr/static/streaming-playlists/hls/e8dab243-af0f-4f17-83d7-a9bb10d4c24e/68a3eb5f-4075-44a8-8696-98cd4f0885b7-master.m3u8https://astrotube.obspm.fr/videos/embed/uKHV8Z8rmwzGP5NPP7BJpY4073012022-04-19T17:02:12.465ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/huA8v95dvjuDsSU1298Npyhttps://astrotube.obspm.fr/lazy-static/thumbnails/c4e77657-6678-41e3-aec3-5703354638a9.jpgDominique Meyer, 20 janvier 2022Dominique Meyer, "Non-thermal radio supernova remnants of runaway massive stars", 20 janvier 2022https://astrotube.obspm.fr/static/streaming-playlists/hls/859013bb-8610-4994-a1ac-802ddb2ea306/bf914279-aa5a-431b-9516-e9e3e6c0b56a-master.m3u8https://astrotube.obspm.fr/videos/embed/huA8v95dvjuDsSU1298Npy2592002022-04-19T17:17:20.505ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/prdmAGPhkB8L1RUWHZpeFShttps://astrotube.obspm.fr/lazy-static/thumbnails/97540b2f-8a38-4fea-8376-75db0b316de7.jpgTiago Costa, 3 février 2022Tiago Costa, "Quasar feedback and the origin of extended Lyα glow in z > 6 quasars", 3 février 2022https://astrotube.obspm.fr/static/streaming-playlists/hls/bdc765c6-5673-48b7-8ed1-8fdb2d1ca924/26e5cfd4-4689-47df-95b5-e72e653483c3-master.m3u8https://astrotube.obspm.fr/videos/embed/prdmAGPhkB8L1RUWHZpeFS3509002022-04-19T17:29:32.343ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/4G6xHTPbcuavvwE4qM24MDhttps://astrotube.obspm.fr/lazy-static/thumbnails/c08f65c2-a5ac-4524-bfe5-8cbb1815ad25.jpgMikhail Lisakov, 10 février 2022Mikhail Lisakov, "An oversized Faraday screen wrapping around the parsec-scale jet in 3C 273", 10 février 2022https://astrotube.obspm.fr/static/streaming-playlists/hls/1de495cf-b8f8-4309-8a06-2943af01ac7b/1626409f-84f2-4d00-9754-16d5ee1f8883-master.m3u8https://astrotube.obspm.fr/videos/embed/4G6xHTPbcuavvwE4qM24MD3087012022-04-19T17:58:22.015ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/aacLW9EQZHxZZgP1D9mw6ahttps://astrotube.obspm.fr/lazy-static/thumbnails/bc6fead3-1f40-4e78-992f-c6a7cae40656.jpgPierre Mourier, 17 février 2022Pierre Mourier, "Ringdown spectroscopy in binary black hole mergers with high overtones : application to local horizon dynamics and gravitational waveforms", 17 février 2022https://astrotube.obspm.fr/static/streaming-playlists/hls/4a2b32c3-9d7e-4025-9b8e-b4a595a5b1a3/7fa6e849-d635-41b1-84ad-23fbfe1de760-master.m3u8https://astrotube.obspm.fr/videos/embed/aacLW9EQZHxZZgP1D9mw6a4151012022-04-19T18:12:18.887ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/4NCDUk4Q4a23fRmP2KDCPFhttps://astrotube.obspm.fr/lazy-static/thumbnails/03adbf34-1797-4fb1-8c8e-695790660805.jpgRoberto Oliveri, 17 mars 2022Roberto Oliveri, "The Weyl BMS group and Einstein’s equations", 17 mars 2022https://astrotube.obspm.fr/static/streaming-playlists/hls/1ece37c9-2ff4-4f85-a5ff-217bea6787b5/54278129-2d1f-4e54-bf0d-cffcc1cddf8f-master.m3u8https://astrotube.obspm.fr/videos/embed/4NCDUk4Q4a23fRmP2KDCPF3526052022-04-19T23:32:16.767ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/59WczQFefe8NvQBPXnTo6Lhttps://astrotube.obspm.fr/lazy-static/thumbnails/8e59974f-75cf-42d8-877d-fb6d8d391814.jpgLaura Salvati, 24 mars 2022Laura Salvati, "Cosmology with galaxy clusters : impact of theoretical and observational systematic uncertainties, 24 mars 2022https://astrotube.obspm.fr/static/streaming-playlists/hls/21a3e814-5d63-425e-ba6c-78a17cfce74e/629e64e9-e7c4-4d1e-95fa-60a44e2af275-master.m3u8https://astrotube.obspm.fr/videos/embed/59WczQFefe8NvQBPXnTo6L30690102022-04-20T00:19:42.931ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/ohrgFeUntmBmhGmBRNyvGthttps://astrotube.obspm.fr/lazy-static/thumbnails/383362b0-ea56-4309-9b9d-53eb29b2c77b.jpgAmandine Le Brun, 31 mars 2022Amandine Le Brun, "Galaxy clusters as cosmological probes and astrophysical laboratories", 31 mars 2022https://astrotube.obspm.fr/static/streaming-playlists/hls/b4748632-6400-4c3f-bd43-67212017247f/70e78fc4-7a74-42af-aa8f-64d3ebd5b5b0-master.m3u8https://astrotube.obspm.fr/videos/embed/ohrgFeUntmBmhGmBRNyvGt3718022022-04-20T00:58:35.986ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/nRGKUHkkZrGKKzHS4Wz6z4https://astrotube.obspm.fr/lazy-static/thumbnails/59b1437a-35bd-47fe-bac7-dce6e1b5f96f.jpgHector Silva, 7 avril 2022Hector Silva, "Probing strong-field gravity with multimessenger neutron star observations", 7 avril 2022https://astrotube.obspm.fr/static/streaming-playlists/hls/b1007958-f4cd-4fe2-ae48-10fef391ec99/9adb7ac0-40b3-4386-a8c1-63c7fa176d88-master.m3u8https://astrotube.obspm.fr/videos/embed/nRGKUHkkZrGKKzHS4Wz6z43937012022-04-20T01:12:37.262ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/inYiKVT7ecwMG5dfHmMA2ahttps://astrotube.obspm.fr/lazy-static/thumbnails/3e5de214-385f-479d-8bf1-8d6a56cf7875.jpgLotte ter Haar, 14 avril 2022Lotte ter Haar, "Kinetic Screening in the Strong-Field Regime", 14 avril 2022https://astrotube.obspm.fr/static/streaming-playlists/hls/8cbcad21-ac49-480d-b845-b3953251d173/33599c6e-6287-4eaa-8628-ad98f9644200-master.m3u8https://astrotube.obspm.fr/videos/embed/inYiKVT7ecwMG5dfHmMA2a31890242022-04-20T01:23:33.409ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/oaA4sbqy9m8VYUMV4VrfLJhttps://astrotube.obspm.fr/lazy-static/thumbnails/5971318a-4777-406a-a64a-2b19cbf4a0f1.jpgvideo1961439574Speaker: SIMONE SPEZIALE ( CENTRE DE PHYSIQUE THEORIQUE, MARSEILLE) Title: Boundary conditions and energy in general relativity Abstract: Even though general relativity lacks a notion of local energy density, Noether theorem can be used to single out a quasi-local energy in many situations of physical interest. In non-radiative spacetimes, this energy can be shown to be a canonical Hamiltonian generator of symmetries. However, we show that its explicit form depends on the choice of boundary conditions, thus adding a new layer of non-universality of gravitational energy. In the radiative case, the symplectic form is not conserved, and one needs a prescription to define the energy. This was provided by Wald-Zoupas ’99. We discuss some recent developments concerning this construction, discuss what boundary conditions are related to, and allow for a comparison of surface charges at future null infinity and on finite null hypersurfaces.https://astrotube.obspm.fr/static/streaming-playlists/hls/b37fbbff-6fb4-4dca-9e63-a454638f38f2/866f91aa-fd08-4dd3-bed2-d39ec85bb0f9-master.m3u8https://astrotube.obspm.fr/videos/embed/oaA4sbqy9m8VYUMV4VrfLJ46910112022-05-19T12:02:10.473ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/tYNApwWfXR65RcGeiiVtDNhttps://astrotube.obspm.fr/lazy-static/thumbnails/08811d9b-1e3f-4ed4-80c0-923876ace393.jpgGRMHD simulations of neutron star mergers with weak interactionsPredicting electromagnetic signals from binary neutron star mergers is a multi-scale, multi-physics problem. The only multi-messenger event detected so far from this type of system, GW170817, confirmed the basic physical picture of NS mergers, but the origin of its early blue emission and the nature of the GRB engine remains under debate. Moreover, throughout the next decade, more multi-messenger events will be observed, and thus better theoretical models will be crucial to interpret and identify them. In this talk, I will present new GRMHD simulations of NS mergers which include neutrino transport and nuclear equations of state. I will first show a detailed analysis of the dynamical ejecta and its r-process nucleosynthesis obtained from these simulations. Based on these results and using new semi-analytical models, I will give a comprehensive picture of the electromagnetic signatures associated with the dynamical phase, namely, the free neutron precursor and the kilonova afterglow. Finally, I will show preliminary results on post-merger physics, where both magnetic fields and neutrinos become crucial to understanding the evolution and outflows from the system.https://astrotube.obspm.fr/static/streaming-playlists/hls/e2951be8-ccd8-43c8-9dfa-56a669bc6594/f9540608-359f-4a5d-9f93-8589a4203996-master.m3u8https://astrotube.obspm.fr/videos/embed/tYNApwWfXR65RcGeiiVtDN3227092022-05-31T12:12:30.834ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/xowKrcqHxaWGHcZbdjjccWhttps://astrotube.obspm.fr/lazy-static/thumbnails/d1f8b229-72e5-4a2a-a7fb-70161bf945e1.jpg(English Subtitles)- Yafits : an example of distributed quick-look viewerTitle: Yafits : an example of distributed quick-look viewer By: Philippe Salomé, Nicolas Moreau, Yaye-Awa Ba Subtitles in English (click on the icon parameters) SF2A 2022 - Workshop : The revival of radio astronomy and SKA is now!https://astrotube.obspm.fr/static/streaming-playlists/hls/fe309c6e-ad20-4f6e-8a94-392b807802b0/21ff1608-abcc-4fa1-8916-22ee13060c91-master.m3u8https://astrotube.obspm.fr/videos/embed/xowKrcqHxaWGHcZbdjjccW6260262022-06-06T14:03:00.944ZYESMain salome channelNOhttps://astrotube.obspm.fr/w/9HFqABsswXahDbLbewHwRAhttps://astrotube.obspm.fr/lazy-static/thumbnails/e0e024d2-bca8-4bbf-acb3-51cc92103eba.jpgCosmic-ray confinement and Non-thermal emission in star-forming galaxiesCosmic rays (CRs) are responsible for a tight correlation between the star formation rate (SFR) and the radio/gamma-ray luminosity observed in star-forming galaxies (SFGs). A linear scaling can explain this correlation between the SFR and the number of CR acceleration sites, such as supernova remnants, coupled with particle escape dependence with galaxy properties. However, the nature of the main cosmic-ray transport processes that shape the emission in these galaxies is still poorly understood. In this work, we performed a multi-wavelength investigation (focus on the gamma-ray energy range) of the CR population and the effective fields affecting their transport within SFGs with different activity levels. With this goal, we develop a model describing the CR transport in SFGs for a broad range of SFRs. We take advantage of the available observations to place strong constraints on the physical processes that govern the non-thermal physics of these sources, and we also made predictions for the upcoming Cherenkov Telescope Array observations.https://astrotube.obspm.fr/static/streaming-playlists/hls/469ae659-8738-4423-9ea3-70e114d2b75c/cc60795d-d3f1-480a-96f3-0593ae391f44-master.m3u8https://astrotube.obspm.fr/videos/embed/9HFqABsswXahDbLbewHwRA3330062022-06-09T14:50:24.437ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/cgKonm1c7B8j1X2PJj82Vjhttps://astrotube.obspm.fr/lazy-static/thumbnails/f18776d4-9278-42d5-b22d-936883166a6d.jpgFirst image of the black hole shadow in the Galactic Center by MACIEK WIELGUS (BONN, GERMANY)There is a supermassive compact object, named Sagittarius A*, in the center of the Milky Way. We have recently obtained the highest resolution images of this object with the Event Horizon Telescope, a global network of radio telescopes operating at high frequency of 230 GHz. In this talk I will discuss the challenges related to obtaining these images, their theoretical interpretation, as well as the question of how much confidence we have in Sagittarius A* being a Kerr black hole, following these new results.https://astrotube.obspm.fr/static/streaming-playlists/hls/5b476b4e-ba3f-464e-a300-5e68a6b97ef0/60f428db-0399-4e91-b867-0623f824d098-master.m3u8https://astrotube.obspm.fr/videos/embed/cgKonm1c7B8j1X2PJj82Vj46070162022-07-07T13:22:57.853ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/xBdNDbk1zgLKGtfa1YEp1vhttps://astrotube.obspm.fr/lazy-static/thumbnails/003e17c7-a4c7-4887-a141-0cbe0dd43a2c.jpgLa Tête dans les Étoiles - 01 - La LuneLa Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 01 : que voir sur la Lune et comment l'observer en ce début septembre 2022. Crédits images : La Lune par le Club Astro de l'Observatoire de Paris : https://clubastro.obspm.fr La mission SLS par la NASA : https://www.nasa.gov/exploration/systems/sls/index.htmlhttps://astrotube.obspm.fr/static/streaming-playlists/hls/fff638a3-e229-47d1-bf9a-8d204f3d5e09/01caabbb-644f-48fa-a6ed-755e1b616d9d-master.m3u8https://astrotube.obspm.fr/videos/embed/xBdNDbk1zgLKGtfa1YEp1v17701042022-09-10T08:34:52.275ZluneastronomieYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/coZxbQB5Nd5dT73ovCzay3https://astrotube.obspm.fr/lazy-static/thumbnails/f0675e46-4d09-4318-9037-d1e11c2768c0.jpgLa Tête dans les Étoiles - 02 - SaturneLa Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 02 : Saturne, le Seigneur des Anneaux Crédits images : Club Astro de l'Observatoire de Paris (https://clubastro.obspm.fr)https://astrotube.obspm.fr/static/streaming-playlists/hls/5c4a58d9-9727-492c-826b-45358195288e/15999e91-e2be-47d2-89ea-2f1ec3945df3-master.m3u8https://astrotube.obspm.fr/videos/embed/coZxbQB5Nd5dT73ovCzay31670292022-09-10T08:40:12.182ZastronomiesaturneYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/8oyLd5KuyNQUdG9RtCm6tThttps://astrotube.obspm.fr/lazy-static/thumbnails/b46381f3-4245-40bd-a7d3-83cce2e7307d.jpgEclipse annulaire du Soleil, 1 septembre 2016, La RéunionVidéo montrant l’éclipse annulaire du Soleil du 1 septembre 2016 condensée en 4 min. Observation en Halpha depuis l’île de la Réunion, France.https://astrotube.obspm.fr/static/streaming-playlists/hls/3bd68624-3f1b-47dc-a97d-37259d188785/d1e4e4b6-ba30-4daa-b73b-74de5f002bc5-master.m3u8https://astrotube.obspm.fr/videos/embed/8oyLd5KuyNQUdG9RtCm6tT259042022-09-13T14:05:05.719ZYESTestNOhttps://astrotube.obspm.fr/w/oWNC4yQjbqQpdL2dCyvSaQhttps://astrotube.obspm.fr/lazy-static/thumbnails/4eb6cfb9-c554-474e-8fc8-fa37066b7198.jpgLa Tête dans les Étoiles - 03 - Le Triangle d'ÉtéLa Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 03 : Le Triangle d'Été Crédits images : Club Astro de l'Observatoire de Paris (https://clubastro.obspm.fr) et Stellarium (https://stellarium.org) https://astrotube.obspm.fr/static/streaming-playlists/hls/b9cff21e-3ca4-4acb-8461-783602156bca/6a226212-c4a6-4fe0-a3ec-ed432a1b5cd2-master.m3u8https://astrotube.obspm.fr/videos/embed/oWNC4yQjbqQpdL2dCyvSaQ1850222022-09-17T07:42:40.566ZétéastronomiecygnealbiréoissYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/sSwZSktjMmC5TrB2mteVuzhttps://astrotube.obspm.fr/lazy-static/thumbnails/851a7c8b-11cb-482f-aa4c-b695e7ea8044.jpgJets, Blobs, and Circular Polarization : Using PLUTO and RADMC-3D to Model Time Domain Variabilit...Blazars are an extreme subclass of active galactic nuclei (AGN), in which an accreting supermassive black hole launches a powerful relativistic jet of magnetized plasma that is closely aligned to our line-of-sight. Blazar jets : (i) shine across the entire electromagnetic spectrum (from low-frequency radio waves to high-energy gamma-rays), (ii) exhibit dramatic flares (on time scales ranging from days to minutes), and (iii) dominate the high-energy extragalactic sky. Very long baseline interferometric (VLBI) arrays (such as phased ALMA and The Event Horizon Telescope) are capable of imaging the polarized synchrotron emission emanating from the innermost regions of relativistic blazar jets with unprecedented angular resolution and sensitivity. In particular, the linearly and circularly polarized synchrotron emission from blazar jets carry imprints of both the strength and orientation of the collimating magnetic field as well as the plasma content of the jet environment. In parallel to these advances in VLBI imaging, modern computational resources now support the execution of increasingly sophisticated 3D numerical jet simulations, from shock-in-jet/turbulence models, to relativistic magneto-hydrodynamic (RMHD) and particle-in-cell (PIC) plasma simulations. In this talk, I will present a new suite of relativistic jet simulations which study the variability in the circular polarization produced by a blob of relativistic plasma passing through a standing recollimation shock within a jet. This is accomplished through the use of the PLUTO code in concert with polarized radiative transfer ray-tracing calculations computed using the RADMC-3D code. The physical implications of this polarization variability will be discussed and direct comparisons will be made to full-Stokes light curves obtained with the Polarimetric Monitoring of AGN at mm-Wavelengths (POLAMI) Program.https://astrotube.obspm.fr/static/streaming-playlists/hls/d99be58d-1c71-4325-9b15-67e630c8f0e5/cc90543d-367d-48cf-a895-def4b4f00fc4-master.m3u8https://astrotube.obspm.fr/videos/embed/sSwZSktjMmC5TrB2mteVuz2851052022-09-23T09:39:17.664ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/jYVGoPmTPSG3Z9LsZVCbcDhttps://astrotube.obspm.fr/lazy-static/thumbnails/df0b902a-47d7-44ce-98c7-f789a50d7278.jpgLa Tête dans les Étoiles - 04 - JupiterLa Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 04 : fin septembre 2022, Jupiter est au plus proche de la Terre (un phénomène qui arrive tous les 13 mois). C'est le moment de l'admirer.https://astrotube.obspm.fr/static/streaming-playlists/hls/99b73d15-3cfa-4750-ae1b-acca352aa31b/33db85af-fb80-4cfe-86f7-a1bcbdf94368-master.m3u8https://astrotube.obspm.fr/videos/embed/jYVGoPmTPSG3Z9LsZVCbcD1580262022-09-24T08:27:35.554ZjupiterastronomieYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/uX4pdo1R1p8suHS1wY8A8Jhttps://astrotube.obspm.fr/lazy-static/thumbnails/cc007fcc-0dde-49ac-97ea-4f28e02464e0.jpgNouvelles solutions exactes des équations d’Einstein, Oratrice : MARIE-NOËLLE CELERIERConversation pédagogique autour de nouvelles solutions exactes des équations de la Relativité Générale ou comment résoudre des problèmes complexes en les simplifiant et en concevant des recettes applicables à de nombreux cas auxquels on n’avait pas pensé à l’origine.https://astrotube.obspm.fr/static/streaming-playlists/hls/ea6fe2a2-d222-46b4-b38a-6d3bfbf699e0/e860c42d-4e3f-4f15-854f-f5bbe985805c-master.m3u8https://astrotube.obspm.fr/videos/embed/uX4pdo1R1p8suHS1wY8A8J44430192022-09-29T11:17:45.194ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/xrXtsNWAWAghDtW6tJ4D5Khttps://astrotube.obspm.fr/lazy-static/thumbnails/da46fc4f-25a0-4264-abae-004c6fd29877.jpgLa Tête dans les Étoiles - 05 - La Grande OurseLa Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 05 : À la découverte d'une des constellations les plus célèbres, la Grande Ourse.https://astrotube.obspm.fr/static/streaming-playlists/hls/feab1457-8681-42c7-a29b-762f62f02d7f/685c7604-450b-42d0-9d5e-53db748d1b4d-master.m3u8https://astrotube.obspm.fr/videos/embed/xrXtsNWAWAghDtW6tJ4D5K1540152022-10-01T10:24:56.634ZGrande OurseastronomieYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/6TaK9hw8yeRXT31Ai2HJ1chttps://astrotube.obspm.fr/lazy-static/thumbnails/ffd1292e-f3ff-46d6-a82a-20497f795d1a.jpgIncluding eccentricity effects into effective one-body based gravitational wave models BY ANDREA ...Gravitational wave (GW) astronomy demands an enormous amount of waveform templates, both to search for new GW events and to properly infer the parameters of the GW sources, primarily compact binary coalescences (CBCs). In this talk I will review the essential points of the effective one-body (EOB) approach, which currently stands as the most complete, robust and predictive analytical framework to build templates for GW signals produced by CBCs. I will then discuss the role, in this modeling procedure, of the binary orbital eccentricity, whose inclusion in GW models has attracted a growing interest in the last few years. In this context, I will present the outcomes of several works we carried out with the aim of including eccentricity effects in the EOB-based model TEOBResumS, while preserving the factorized and resummed waveform structure which this model entails.https://astrotube.obspm.fr/static/streaming-playlists/hls/2fa2a163-98f1-4979-95f0-cc9bb3578d8b/1f8fbb27-37e1-4299-a69c-ec0ce6d10586-master.m3u8https://astrotube.obspm.fr/videos/embed/6TaK9hw8yeRXT31Ai2HJ1c4570032022-10-13T23:54:35.830ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/nk7UYcd1uAApUMbsngHRJzhttps://astrotube.obspm.fr/lazy-static/thumbnails/1aae061c-b0eb-48a2-9efc-bc2c1f8935ee.jpgLa Tête dans les Étoiles - 06 - Les ConstellationsLa Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 06 : mais au fait, c'est quoi une constellation ?https://astrotube.obspm.fr/static/streaming-playlists/hls/acbb4dce-b1e5-4601-addb-b79c04a97481/70bce315-6772-4873-aee8-51aaf3967770-master.m3u8https://astrotube.obspm.fr/videos/embed/nk7UYcd1uAApUMbsngHRJz1670152022-10-16T16:36:34.030ZastronomieconstellationsYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/krSjnJhHE8Uxs2MmwHEdHxhttps://astrotube.obspm.fr/lazy-static/thumbnails/ad4913f5-de64-47d1-bf9d-fbb918f2076e.jpgLa Tête dans les Étoiles - 07 - Nommer les étoiles (1/2)La Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 07 : Nommer les étoiles. Partie 1/2 : l'histoire des noms d'étoiles.https://astrotube.obspm.fr/static/streaming-playlists/hls/9d7a3cd4-cd57-4615-88c5-9b6580f22fd9/d8ba417a-99eb-4f4a-a225-1d01f5410f1b-master.m3u8https://astrotube.obspm.fr/videos/embed/krSjnJhHE8Uxs2MmwHEdHx1540282022-10-16T17:11:14.212ZastronomieétoilesYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/g3hqSCg8ycS5frxJmDKtrThttps://astrotube.obspm.fr/lazy-static/thumbnails/7e210922-de88-4cf8-b919-1dd3b4caf07a.jpgNon-relativistic regime and topology : consequences for the role of spatial curvature in cosmolog...The standard model of cosmology currently allows for three types of geometries for our Universe (Euclidean, spherical or hyperbolic), each of these types corresponding to a set of different (multiconnected)-topologies. Among these geometries, Newton’s theory of gravity is only defined on the Euclidean one. Still, extending the validity of this theory to the other two cases, with the aim that this should constitute the limit of a relativistic theory of gravity, could provide a strong theoretical tool to probe non-relativistic effects of topology in our Universe. The first part of this presentation will aim at constructing such a theory, using the concept of Galilean structures. We will see that it allows to quantify the effects of topology on the gravitational potential, structure formation and on the global backreaction of inhomogeneities. In the second part, I will show that Einstein’s equation is necessarily incompatible with such an extension of Newton’s theory. However, as a physical hypothesis for our Universe, if we require the non-relativistic regime to exist regardless of the global geometry and topology, then Einstein’s equation should be modified. This can be done by adding a `topological term’ arising from the introduction of a second non-dynamical metric in the theory. The main consequence of this modification is that the expansion law of a homogeneous and isotropic solution no longer features the spatial curvature (i.e. $\Omega = 1, \ \forall \Omega_k$), asking for a reevaluation of that parameter from the current cosmological data.https://astrotube.obspm.fr/static/streaming-playlists/hls/79cab12b-bbff-4478-ada4-521b00254231/ee997769-3369-4354-95b3-4945b2bff5d8-master.m3u8https://astrotube.obspm.fr/videos/embed/g3hqSCg8ycS5frxJmDKtrT4025542022-10-20T12:26:13.524ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/e7HgsAQ3SfAo8rc75tPJCPhttps://astrotube.obspm.fr/lazy-static/thumbnails/5e2e8885-0287-48db-9a01-3d637f5924e2.jpgLa Tête dans les Étoiles - 08 - Éclipse partielle de Soleil du 25/10/2022La Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 08 : Éclipse partielle de Soleil du 25/10/2022https://astrotube.obspm.fr/static/streaming-playlists/hls/6a36b254-77f3-4e59-9776-bc4ff78884c7/48384c97-04a9-4cb1-869d-c08eeb718fb1-master.m3u8https://astrotube.obspm.fr/videos/embed/e7HgsAQ3SfAo8rc75tPJCP1710432022-10-23T07:57:43.275ZéclipseastronomieYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/gurzVDNfNiRV45p5C3B4Jkhttps://astrotube.obspm.fr/lazy-static/thumbnails/1a470544-f593-406f-be94-a08c646b3a61.jpgTribute_to_Sydney_Leach_Scientific_PresentationsZoom recording of the scientific presentations at the colloquium "Photons, molecules and life" : a tribute to Sydney Leach, held in the Meudon Observatory on September 23, 2022 The recording of the concert ending the colloquium is available on : https://vimeo.com/760312676/d263299bf4 and https://youtu.be/wQD25IoR440 https://astrotube.obspm.fr/static/streaming-playlists/hls/7d71ac37-9b41-4673-b4ba-c2140da1119b/b05750af-3b13-4edb-91aa-f50aa457aa12-master.m3u8https://astrotube.obspm.fr/videos/embed/gurzVDNfNiRV45p5C3B4Jk119250172022-10-27T13:16:49.709ZYESMain brillet channelNOhttps://astrotube.obspm.fr/w/qLnNW7xyfVQqqyQufDMqgMhttps://astrotube.obspm.fr/lazy-static/thumbnails/44548ade-c09a-4c12-a368-88dbbfc34e79.jpgLa Tête dans les Étoiles - 09 - Nommer les étoiles (2/2)La Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 09 : Nommer les étoiles. Partie 2/2 : les catalogues stellaires modernes.https://astrotube.obspm.fr/static/streaming-playlists/hls/c88d7e7e-0160-466f-94cb-03bbbec8510b/d7533f88-d4e9-4a77-95fd-6781d99a1ce3-master.m3u8https://astrotube.obspm.fr/videos/embed/qLnNW7xyfVQqqyQufDMqgM1900102022-11-13T10:17:19.719ZgaiaétoilesastronomieYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/39vgPCqXN3WUBqVkzFsKPxhttps://astrotube.obspm.fr/lazy-static/thumbnails/b24970ca-b24f-4e4c-bf3a-2f9ed4315790.jpgNicolas Scepi : Formation, Evolution and Radiation of Magnetized Accretion Disks around Black HolesThe role that magnetic fields play in shaping the evolution and/or the radiative signature of accretion disks around black holes is very uncertain. This uncertainty is mainly due to the scarcity of direct observational constraints on the magnetic field’s geometry or strength in black hole disks. However, even from a theoretical point of view our understanding of magnetized disks remains relatively poor. Indeed, analytic models of magnetized disks often need inputs from numerical simulations and numerical simulations of magnetized disks are difficult to perform and/or interpret. Because of this lack of magnetized disk models, standard disk models often reduce the magnetic field to a source of turbulence ; turbulence through which the accretion can happen. While this simplification may hold for weakly magnetized disks, a large number of numerical simulations have shown that the role of a strong magnetic field goes far beyond producing turbulence. In particular, a strong magnetic field can produce powerful outflows, induce accretion through vertically elevated layers or non-axisymmetric structures, modify the time scales of accretion, enhance dissipation of gravitational energy in the disk and accelerate particles to very high energies. All of these effects will dramatically affect the evolution and the observational signature of accretion disks and open up new and exciting avenues to resolve outstanding problems of the standard accretion disk theory. In this talk, I will present an overview of my recent results on how strongly magnetized disks form, evolve and radiate. I will show in particular how strongly magnetized disks could explain events of very strong variability in AGNs, the flaring behavior of the Galactic center and the hardest emission in X-ray binaries.https://astrotube.obspm.fr/static/streaming-playlists/hls/11624478-f983-49bb-b8f8-c0a21bb63831/c173a0f1-776a-483a-8121-d679ffce8a35-master.m3u8https://astrotube.obspm.fr/videos/embed/39vgPCqXN3WUBqVkzFsKPx4472022022-11-25T09:14:04.764ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/hSUUYAGcK7fqF55E33GCkEhttps://astrotube.obspm.fr/lazy-static/thumbnails/65ae96b6-9836-4189-900b-a99c8576b0c5.jpgDebarati Chatterjee: Gravitational waves as a tool to probe dense matter in Neutron StarsNeutron stars provide a unique way to probe dense matter under extreme conditions, far beyond the reach of current terrestrial experiments. Although recent advances in nuclear theory or nuclear/heavy-ion collision experiments provide clues about the behaviour of dense matter, one must resort to theoretical models to extrapolate to unknown conditions relevant for neutron star interior. Recently the detection of gravitational waves has opened up a new window to the Universe beyond traditional multi-wavelength astronomy. In this talk, I present some of our recent investigations of how gravitational waves, in addition to astrophysical data and information from state-of-the-art terrestrial experiments, allow us to probe the interior composition of neutron stars.https://astrotube.obspm.fr/static/streaming-playlists/hls/88ae041e-40f5-42f5-9a5d-a7265bb0baa4/62f6e66f-f157-4f6c-9c68-61cdd531bcfe-master.m3u8https://astrotube.obspm.fr/videos/embed/hSUUYAGcK7fqF55E33GCkE4162052022-11-25T09:31:49.108ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/whiCZ2GFFADf5eTqjuwu5ehttps://astrotube.obspm.fr/lazy-static/thumbnails/4cff565f-4133-40c2-ba26-78b2aebbc7c9.jpgYAFITS : Example of 1D spectrum plot and smoothYAFITS : Example of 1D spectrum plot and smoothhttps://astrotube.obspm.fr/static/streaming-playlists/hls/f538ee01-0513-4537-b863-54915f0b1715/88b2177a-53bc-4472-b4b6-19bdbd227d2d-master.m3u8https://astrotube.obspm.fr/videos/embed/whiCZ2GFFADf5eTqjuwu5e60002022-11-27T12:34:08.757ZYESMain partemix channelNOhttps://astrotube.obspm.fr/w/6EpLJmF82BZgFbyofWA7Lqhttps://astrotube.obspm.fr/lazy-static/thumbnails/8ddf68a3-061e-42ad-bebf-7939be678dd3.jpgYAFITS : Example of 2D pan, zoom and lutYAFITS : Example of 2D pan, zoom and luthttps://astrotube.obspm.fr/static/streaming-playlists/hls/2dda9b28-b200-45e5-a82e-51513f210fd8/2ee4cbf8-0b15-43d5-9af6-4804cebaeca9-master.m3u8https://astrotube.obspm.fr/videos/embed/6EpLJmF82BZgFbyofWA7Lq43002022-11-27T12:35:13.557ZYESMain partemix channelNOhttps://astrotube.obspm.fr/w/vBvfCLv3JS37g5Hu1kJqC5https://astrotube.obspm.fr/lazy-static/thumbnails/37470ff2-281d-4e42-9134-586d1a420eef.jpgYAFITS : Example of 3D pan, zoom and lutYAFITS : Example of 3D pan, zoom and luthttps://astrotube.obspm.fr/static/streaming-playlists/hls/efce1499-6485-4226-afc7-ceb039b6d5cc/137d9ccc-f54a-49da-ab6c-f191bcd77559-master.m3u8https://astrotube.obspm.fr/videos/embed/vBvfCLv3JS37g5Hu1kJqC581002022-11-27T12:36:59.371ZYESMain partemix channelNOhttps://astrotube.obspm.fr/w/sMdZWNyPSfmGHaaDbLLZh5https://astrotube.obspm.fr/lazy-static/thumbnails/c1afd8c4-fd7a-4cfa-b4dc-76111fcaabcd.jpgYAFITS : Example of select Boxes and display propertiesYAFITS : Example of select Boxes and display propertieshttps://astrotube.obspm.fr/static/streaming-playlists/hls/d8de15f4-479c-41bb-9317-5af6d9651f48/59c048d7-7a51-4a92-a5d1-c1823a6957c0-master.m3u8https://astrotube.obspm.fr/videos/embed/sMdZWNyPSfmGHaaDbLLZh567002022-11-27T12:38:21.784ZYESMain partemix channelNOhttps://astrotube.obspm.fr/w/46N7NLC55a5BCXeCb3xoY2https://astrotube.obspm.fr/lazy-static/thumbnails/a9182717-35f3-4b79-b825-8a0e9ed87e9f.jpgYAFITS : Example of select Contours and display propertiesYAFITS : Example of select Contours and display propertieshttps://astrotube.obspm.fr/static/streaming-playlists/hls/191a8e3f-90d9-4c65-81b4-44404003cf81/9a9606f4-444f-4420-9469-c50c1d1c3ffc-master.m3u8https://astrotube.obspm.fr/videos/embed/46N7NLC55a5BCXeCb3xoY289012022-11-27T12:40:26.566ZYESMain partemix channelNOhttps://astrotube.obspm.fr/w/bzoCPHgPetWcgh5KCJRt9ahttps://astrotube.obspm.fr/lazy-static/thumbnails/f43a0ab8-2c3f-4c97-b13d-78e0ebd1e51c.jpgYAFITS : Example of select Markers and display propertiesYAFITS : Example of select Markers and display propertieshttps://astrotube.obspm.fr/static/streaming-playlists/hls/55a4e157-c9a1-45e6-a3af-6faa08ec0e2d/dd0640c1-d1d7-486f-a863-85f74ee9bba3-master.m3u8https://astrotube.obspm.fr/videos/embed/bzoCPHgPetWcgh5KCJRt9a119002022-11-27T12:43:23.985ZYESMain partemix channelNOhttps://astrotube.obspm.fr/w/9ajK8UTokEvU4abtESKWm1https://astrotube.obspm.fr/lazy-static/thumbnails/dee2977c-3a6d-4957-bea4-87999b4edb8d.jpgYAFITS : Display Channel mapsYAFITS : Display Channel mapshttps://astrotube.obspm.fr/static/streaming-playlists/hls/42165abc-e34a-46e1-9ea6-37c280af7278/4809623a-b372-48e2-8c94-9a0a625642a0-master.m3u8https://astrotube.obspm.fr/videos/embed/9ajK8UTokEvU4abtESKWm161012022-11-27T12:53:33.601ZYESMain partemix channelNOhttps://astrotube.obspm.fr/w/2dKN9soiJ3atZCj4F6sW3Jhttps://astrotube.obspm.fr/lazy-static/thumbnails/b05b1353-871a-4777-8422-0ef9c14adc37.jpgYAFITS : Example of Moment Map (Integrated intensity)YAFITS : Example of Moment Map (Integrated intensity)https://astrotube.obspm.fr/static/streaming-playlists/hls/09e10dcc-e6fe-4e3d-ab51-061477414cb6/fdf0fcfa-1080-45c1-bd90-845dcc6cf6bd-master.m3u8https://astrotube.obspm.fr/videos/embed/2dKN9soiJ3atZCj4F6sW3J107032022-11-27T12:57:13.779ZYESMain partemix channelNOhttps://astrotube.obspm.fr/w/123q6GZaYXYiRDbYYabjMXhttps://astrotube.obspm.fr/lazy-static/thumbnails/d2a3f0f5-2f67-4458-8ec8-26501c94f919.jpgYAFITS : Search in NED catalogue, plot markers, edit tableYAFITS : Search in NED catalogue, plot markers, edit tablehttps://astrotube.obspm.fr/static/streaming-playlists/hls/00253b7c-7cfe-4884-8cc1-04cef4170711/9f312009-d1b6-469f-9985-44089edb850d-master.m3u8https://astrotube.obspm.fr/videos/embed/123q6GZaYXYiRDbYYabjMX100002022-11-27T13:00:21.063ZYESMain partemix channelNOhttps://astrotube.obspm.fr/w/nDe9VJe86wsoZVqiqahtYHhttps://astrotube.obspm.fr/lazy-static/thumbnails/0f50f970-34aa-436c-ad2a-c6019c216c30.jpgYAFITS : Example of Spectral Line Identification (extra-galactic case : one line)YAFITS : Example of Spectral Line Identification (extra-galactic case : one line)https://astrotube.obspm.fr/static/streaming-playlists/hls/af4289a8-afed-4b22-a524-1d8ccbfd9bf5/64115b76-0440-4655-968d-138ba1adef61-master.m3u8https://astrotube.obspm.fr/videos/embed/nDe9VJe86wsoZVqiqahtYH88002022-11-27T13:03:10.472ZYESMain partemix channelNOhttps://astrotube.obspm.fr/w/tykmATgWbz6epra7qZPGGkhttps://astrotube.obspm.fr/lazy-static/thumbnails/f5a151ce-b119-4d46-8d7a-bc0a3a67c19b.jpgYAFITS : Example of Spectral Line Identification (Galactic case : line survey)YAFITS : Example of Spectral Line Identification (Galactic case : line survey)https://astrotube.obspm.fr/static/streaming-playlists/hls/df2a78f7-53ba-4f1f-906f-5cb5568392ab/1371b83b-51d0-468a-8d86-b9467b11d765-master.m3u8https://astrotube.obspm.fr/videos/embed/tykmATgWbz6epra7qZPGGk95012022-11-27T13:04:54.109ZYESMain partemix channelNOhttps://astrotube.obspm.fr/w/cwxAtMcAdmzWaqrawf9Ybzhttps://astrotube.obspm.fr/lazy-static/thumbnails/4e29451b-167c-43d5-a9a7-489c410c13e7.jpgYAFITS : Send images nd markers in Aladin via SampYAFITS : Send images nd markers in Aladin via Samphttps://astrotube.obspm.fr/static/streaming-playlists/hls/5d584f23-d612-46c3-b5b5-5234770853e5/9f9ac279-de31-4449-8939-979ecca0a4ca-master.m3u8https://astrotube.obspm.fr/videos/embed/cwxAtMcAdmzWaqrawf9Ybz49012022-11-28T08:44:53.042ZYESMain partemix channelNOhttps://astrotube.obspm.fr/w/ssuhNwhTUPzd9dFFfhKEwYhttps://astrotube.obspm.fr/lazy-static/thumbnails/65e0cf16-7293-4101-b2f3-c31dcb73f0b2.jpgYAFITS : Send spectrum into CASSIS via SAMPYAFITS : Send spectrum into CASSIS via SAMPhttps://astrotube.obspm.fr/static/streaming-playlists/hls/d6406098-254b-4ce2-8e41-cf4e98a3f014/404bd5e2-26e5-44df-ba0b-eb8de9d86f41-master.m3u8https://astrotube.obspm.fr/videos/embed/ssuhNwhTUPzd9dFFfhKEwY16042022-11-28T11:44:35.559ZYESMain partemix channelNOhttps://astrotube.obspm.fr/w/wsmhw5UeBS6qJJ14h5MyWohttps://astrotube.obspm.fr/lazy-static/thumbnails/4d0b17c8-6d54-4c45-a339-0d2f8026c604.jpgUnveiling the progenitor of Fast Radio Bursts, speaker: MARILYN CRUCES (MPIFR / NAOC POSTDOCTORAL...A new and rapidly evolving field in astronomy is Fast Radio Bursts (FRBs). They are an observational phenomenon consisting of bright flashes at extragalactic distances and detected exclusively at radio frequencies. Their coherent and narrow pulses probe the large distances they have travelled and thus, FRBs have been proposed as a powerful cosmological tool to probe the epoch of re-ionisation, the homogeneity and isotropy of the Universe ; and testing fundamental physics such as the weak equivalence principle and the photon rest mass. Although their origin remains mysterious, the most popular scenarios associate FRBs with highly magnetised neutron stars, known as magnetars. In this talk, we will review the key recent observational results : the repetition pattern and periodic activity phases, their dynamic local environment and the implications of the association to persistent radio sources of yet unknown origin.https://astrotube.obspm.fr/static/streaming-playlists/hls/f69fffaf-b806-4684-b6ff-6621d4d300da/a11fe597-22d3-49ac-be04-5413d226c0fd-master.m3u8https://astrotube.obspm.fr/videos/embed/wsmhw5UeBS6qJJ14h5MyWo3938022022-12-01T11:46:50.288ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/6m5VQF641g6j6ZYb9g96Mrhttps://astrotube.obspm.fr/lazy-static/thumbnails/9cecb974-bd8d-4b4d-aefc-3af6f12ac97f.jpgLa Tête dans les Étoiles - 10 - Artemis I et la LuneLa Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 10 : La mission Artemis I et la Lune.https://astrotube.obspm.fr/static/streaming-playlists/hls/2b4b9b18-f273-4083-b69d-8a4ae85473af/e6f13fbf-69fd-4256-aca8-a3a10a3b7090-master.m3u8https://astrotube.obspm.fr/videos/embed/6m5VQF641g6j6ZYb9g96Mr1590122022-12-04T08:54:29.577ZnasaslsartemisluneYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/6kQ76vsJrP6f2oGNNmPR3Mhttps://astrotube.obspm.fr/lazy-static/thumbnails/c4dc3f83-3bb4-4bc3-918d-cd7937f34b2d.jpgLa Tête dans les Étoiles - 11 - Un télescope pour NoëlLa Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 11 : Un télescope pour Noël Annuaire des structures de l'Association Française d'Astronomie : https://www.afastronomie.fr/structureshttps://astrotube.obspm.fr/static/streaming-playlists/hls/2b427882-90db-44f6-b079-50897a353d5d/167d4224-ce74-4064-9c80-dba8d266394e-master.m3u8https://astrotube.obspm.fr/videos/embed/6kQ76vsJrP6f2oGNNmPR3M1680102022-12-04T11:46:02.161ZastronomienoeltelescopeYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/jG5zvyMnS5s1PDcZEhxiMxhttps://astrotube.obspm.fr/lazy-static/thumbnails/7503b816-1842-42f6-931b-8e86c63b0c2e.jpgLa Tête dans les Étoiles - 12 - Mars, Mars, Mars !La Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 12 : Mars, Mars, Mars ! Lien Youtube pour suivre l'occultation du 8 décembre 2022 : https://www.youtube.com/watch?v=lmBWK4JHvRkhttps://astrotube.obspm.fr/static/streaming-playlists/hls/975d115c-b8da-4ec8-b758-326adadcce0d/31aff23e-3c31-4d63-bd6c-1ef4d32bc0ae-master.m3u8https://astrotube.obspm.fr/videos/embed/jG5zvyMnS5s1PDcZEhxiMx1700212022-12-04T12:19:12.288ZmarsastronomieoccultationYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/jDxYhjqqCbkPGrak8VwHuNhttps://astrotube.obspm.fr/lazy-static/thumbnails/cb8f04c7-2960-4c44-b37c-021110234d8f.jpgSupermassive Black Holes as Cosmic Particle Accelerators. Prof. Frank Rieger (ITP UNIVERSITY OF H...Accreting supermassive black holes are thought to drive the energy output in the form of radiation and relativistic plasma outflows (jets) seen in Active Galaxies. As such they allow us an excellent opportunity to probe the realm of extreme physics. I will highlight some recent results on the high-energy diagnostics of these objects, ranging from non-thermal magnetospheric processes in the vicinity of supermassive black holes to the physical characteristics of their large-scale jets. On black hole horizon scales, gap-type particle acceleration could be responsible for the rapidly variable gamma-ray emission seen by ground-based VHE instrument, and provide the plasma source needed for continuous jet formation. On larger scales, stochastic-shear particle acceleration could be behind the extended high-energy emission seen in their kilo-parsec-scale jets. I will give an introduction to these scenarios, comment on their potential role for UHECR production, and discuss some current caveats and challenges.https://astrotube.obspm.fr/static/streaming-playlists/hls/9702b7c2-5595-4f97-bec2-0cc4863d8fea/283e23ff-5544-4cb6-8eff-6c515599a4e1-master.m3u8https://astrotube.obspm.fr/videos/embed/jDxYhjqqCbkPGrak8VwHuN5734052022-12-07T09:55:44.227ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/q51rnZpDmV9yNBD1mBeduGhttps://astrotube.obspm.fr/lazy-static/thumbnails/f63c6785-29da-42d0-86d8-c1bdda5f1893.jpgTests of alternative theories with planetary ephemerides, par AGNÈS FIENGA( OCA, NICE)In this seminar I will give an introduction of the relativistic framework used for building planetary and lunar ephemerides and I will review the recent results obtained in testing PPN formalism, Yukawa suppression and Einstein dilation theory.https://astrotube.obspm.fr/static/streaming-playlists/hls/c2ea9294-c659-4a5a-9704-d74698a21568/e3c26ae9-2f94-4774-acf5-3bc301066711-master.m3u8https://astrotube.obspm.fr/videos/embed/q51rnZpDmV9yNBD1mBeduG37180102022-12-08T12:58:10.238ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/fiSJ7yinK1NdHADcNswdfMhttps://astrotube.obspm.fr/lazy-static/thumbnails/d1e91fc0-cfe1-4ef7-89f4-ecd880e78a06.jpgCarte de vœux 2023 de l'Observatoire de Paris - PSLL'Observatoire de Paris - PSL vous souhaite une belle et heureuse année 2023 ! Production : Fab&Fab Copyright : Observatoire de Paris - PSL, 2022https://astrotube.obspm.fr/static/streaming-playlists/hls/73ded8ad-20d0-4464-ab49-47eca3dcdd59/f656a4ad-7fbe-4ac7-8e8e-66eb20d0ae5c-master.m3u8https://astrotube.obspm.fr/videos/embed/fiSJ7yinK1NdHADcNswdfM660692022-12-20T10:09:00.655ZYESMain mhosokawa channelNOhttps://astrotube.obspm.fr/w/dHmXrddaBuJPX6Nbt7j5Pyhttps://astrotube.obspm.fr/lazy-static/thumbnails/7d5f0082-ec7d-405a-9441-2525ab81c3d4.jpgGreeting card 2023 of the Observatoire de Paris - PSLObservatoire de Paris - PSL wishes you a Happy New Year 2023 Production : Fab&Fab Copyright : Observatoire de Paris - PSL, 2022https://astrotube.obspm.fr/static/streaming-playlists/hls/66f412ac-5425-4eca-9177-7d04fa0a94e6/441ee88e-a1ec-4ca4-9d9d-8c96498a97b7-master.m3u8https://astrotube.obspm.fr/videos/embed/dHmXrddaBuJPX6Nbt7j5Py660212022-12-20T11:10:49.519ZYESMain mhosokawa channelNOhttps://astrotube.obspm.fr/w/qS6ZnyzjpHGnVjefBZkdpnhttps://astrotube.obspm.fr/lazy-static/thumbnails/45d4d044-bf9d-44f8-8ff3-58b28da3f874.jpgMultiwavelength Studies of the Extreme HBL 1ES2344+514. Speaker: Habib Ahammad MondalBlazars are radio-active Active Galactic Nuclei (AGN), where the relativistic jet is pointed towards our line of sight. The corresponding broadband spectral energy distribution shows two broad components. The lower energy component is located in the optical-to-X-ray band while the high energy component peaks in the gamma-ray regime. Blazars are classified depending on the position of the peak frequency of the synchrotron component. Extreme high-frequency BL Lacs (EHBLs) objects show a synchrotron peak frequency above 1017Hz. 1ES2344+514 is a nearby blazar having a redshift of z=0.044. It shows intermittent EHBL features- sometimes it behaves as EHBL and other times not. This source was detected in VHE by the Whipple 10m telescope during its bright flare in December 1995. Following the event, few multi wavelength (MWL) campaigns have been organised to have a better study of the source. During most of these observations, the source was found to be in a much lower state than the flaring one. The broadband SED thus obtained describes the source during its low activity. A single zone synchrotron self compton(SSC) model well described the data in this period. This talk will discuss the results obtained from the MWL campaigns carried out by the MAGIC collaboration following the 2016 flare and a much more dense campaign in the future.https://astrotube.obspm.fr/static/streaming-playlists/hls/c95a3511-556d-4a9c-b392-403a410e0963/f5504fa8-b9bd-49b3-b148-7f9507551986-master.m3u8https://astrotube.obspm.fr/videos/embed/qS6ZnyzjpHGnVjefBZkdpn1919062023-01-12T14:23:08.100ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/cBmdewkrgzpBqhTMJ4nzAyhttps://astrotube.obspm.fr/lazy-static/thumbnails/2218338c-8008-4042-a26c-d74b370868d9.jpgPhenomenology of Galactic cosmic-ray transport,. Speaker: Vo Hong Minh PhanThe origin of cosmic rays remains one of the greatest mysteries in Modern Astrophysics. Identifying the sources of these energetic particles indeed requires better knowledge of their spectra not only in the local interstellar medium but also at different positions in the Galactic disk. In this respect, interstellar gas is the key to reveal the mysterious origin of cosmic rays. This is because the interaction between cosmic rays and gas could result in observable signatures which might serve as indirect probes for cosmic rays. In this talk, I will first introduce two of most interesting indirect probes namely gamma-ray emissions and ionization rates together with some related anomalies concerning these observational constraints. I will then discuss the progress that has been made to better understand these anomalies and might ultimately allow us to gain more insights into the distribution of Galactic cosmic-ray sources.https://astrotube.obspm.fr/static/streaming-playlists/hls/5e04033b-b33a-4f4c-9eda-9a75f65676f0/8ac24272-9c3c-436d-af1e-ec8c028ce043-master.m3u8https://astrotube.obspm.fr/videos/embed/cBmdewkrgzpBqhTMJ4nzAy3297072023-02-09T11:57:35.086ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/eEvuLp4iqSeQG5SF8nWDUYhttps://astrotube.obspm.fr/lazy-static/thumbnails/32a14f9c-964a-4c23-956b-b3af64ce1a3e.jpgBlack hole ringdown beyond general relativity. Speaker : NICOLA FRANCCHINI (APC)In this talk, I will sketch a procedure to compute quasi-normal modes of rotating black holes in alternative theories of gravity, when the modification from general relativity is determined by a small coupling constant that can be treated perturbatively. In general, one obtains a Teukolsky equation which is modified by terms proportional to the small coupling parameter. I will show a toy model involving only a scalar perturbation and comment on how one can generalize the procedure to the tensor case. In general, one would find a radial equation whose potential is modified with respect to general relativity. With a simplified non-rotating set up, I will show how these modifications can be constrained with high-precision gravitational-wave measurements of the black hole’s quasi-normal mode frequencies. By assuming the modifications to be proportional to the small coupling parameter, and further performing a Taylor expansion in M/r, one can compute the quasi-normal modes of the modified potential up to desired order in the perturbative parameter. Either through a principal component analysis or via Markov-chain Monte-Carlo methods, I will recover the Taylor coefficients in the M/r expansion. In both cases, even if the overall reconstruction is good, the bounds on the individual parameters are not robust. Since quasi-normal mode frequencies are related to the behaviour of the perturbation potential near the light ring, I will show a different strategy. By mapping the Taylor expansion to the value of the potential and its derivatives at the peak of the light-ring by using Wentzel–Kramers–Brillouin theory, I can show that the value of the potential and its second derivative at the light ring can be robustly constrained.https://astrotube.obspm.fr/static/streaming-playlists/hls/6ea73e4d-6c49-4c05-a2e8-9cd42afabd14/872ddb91-ee2e-489b-8079-e1748d3e31a7-master.m3u8https://astrotube.obspm.fr/videos/embed/eEvuLp4iqSeQG5SF8nWDUY3297022023-02-09T12:21:09.672ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/2LpLr8smLwNm3PWpFFVTZKhttps://astrotube.obspm.fr/lazy-static/thumbnails/7fddc2a5-3ef5-4b0a-9454-e53ff73fd340.jpgLa Tête dans les Étoiles - 20 - Comète C/2022 E3 (ZTF) : un bilan mitigéLa Tête dans les Étoiles, tous les samedis à 8h40 en 2022-2023 sur France Bleu Roussillon. Épisode 20 : Comète C/2022 E3 (ZTF) : un bilan mitigé Crédits images : - Première image de la comète : Óscar Martín Mesonero (Organización Salmantina de la Astronáutica y el Espacio)/Nasa - Animation de la comète sur fond d'étoiles : Club Astro de l'Observatoire de Paris (https://clubastro.obspm.fr) - Comète C/2020 F3 (NEOWISE) : SimgDe (Wikimedia : https://commons.wikimedia.org/wiki/File:Comet_2020_F3_(NEOWISE)_on_Jul_14_2020_aligned_to_stars.jpg)https://astrotube.obspm.fr/static/streaming-playlists/hls/0e4c82cb-3cde-4e89-af83-491a48ba4819/4eb0de25-ed18-4e0c-b335-dab5dafd8e0d-master.m3u8https://astrotube.obspm.fr/videos/embed/2LpLr8smLwNm3PWpFFVTZK240062023-02-26T18:13:46.984Zastronomieztf2022comèteYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/fb2ZhDQydk9R2tsFvYrH7ahttps://astrotube.obspm.fr/lazy-static/thumbnails/39512025-cd0d-463d-8b3f-cca24502a7d0.jpgLa Tête dans les Étoiles - 21 - Vénus & JupiterLa Tête dans les Étoiles, tous les samedis à 8h40 en 2022-2023 sur France Bleu Roussillon. Épisode 21 : Vénus & Jupiter Crédits images : - Jupiter, Vénus et la Lune dans le ciel de Meudon : M. Montargès - Éphéméride du mouvement rétrograde de Mars en 2020-2021 : P. Chevalley / Carte du Ciel https://astrotube.obspm.fr/static/streaming-playlists/hls/72c69a99-c643-485c-a951-483b74326671/961987e8-c7d4-4aba-a3a7-be479e157976-master.m3u8https://astrotube.obspm.fr/videos/embed/fb2ZhDQydk9R2tsFvYrH7a2650102023-02-26T18:13:49.093ZJupiter2023VénusastronomieYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/dCDEhM9n8WyjGszmpzysj2https://astrotube.obspm.fr/lazy-static/thumbnails/4a47d7c0-8fb1-4494-ba3e-e0e482b4d0d4.jpgLa Tête dans les Étoiles - 22 - SiriusLa Tête dans les Étoiles, tous les samedis à 8h40 en 2022-2023 sur France Bleu Roussillon. Épisode 22 : Sirius Crédits images : - Les couleurs de Sirius : Amanda Cross - Extraits des films Harry Potter III et V: Warner Bros - Image de Sirius A et B : Télescope Spatial Hubble - Sopdet : https://commons.wikimedia.org/wiki/File:Sopdet.svg https://astrotube.obspm.fr/static/streaming-playlists/hls/664ba606-97fa-46a2-ad33-eaae6670a8ad/d7a588a1-fc8e-4777-aea9-7cab0067524b-master.m3u8https://astrotube.obspm.fr/videos/embed/dCDEhM9n8WyjGszmpzysj22910192023-03-04T14:23:56.049Zcannis majorisastronomiesiriusYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/1uz4UqtZbiRwWXpngo5YtYhttps://astrotube.obspm.fr/lazy-static/thumbnails/f70b0d85-5a32-4d3a-8da4-7432bf0ac969.jpgANTHROPOCÈNE : LE CONSTAT BIOPHYSIQUE par Alexandre Le TiecAllons-nous pouvoir continuer à maintenir des organisations sociales suffisamment stables et complexes afin d’assurer la poursuite de l’exploration de l’Univers, et ce de façon durable ? À l’heure de l’épuisement des ressources énergétiques fossiles, du dérèglement climatique, des ravages écologiques et de l’effondrement du vivant sur Terre, la poursuite de l’aventure scientifique est profondément remise en question. Ce séminaire résumera succinctement la première partie d’un cours d’une trentaine d’heures visant, au travers d’une enquête synthétisant les connaissances les plus récentes en sciences de la nature, en sciences humaines et sociales, et en science des systèmes, à plonger jusqu’aux racines de l’Anthropocène.https://astrotube.obspm.fr/static/streaming-playlists/hls/03fd343a-2579-45a6-8127-6fcd01448a56/13d6d0ba-e9d6-4568-84b5-c1ac335a2fb8-master.m3u8https://astrotube.obspm.fr/videos/embed/1uz4UqtZbiRwWXpngo5YtY480201032023-03-09T13:11:43.062ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/9TgKWZrvmEyXhRbYjXASKHhttps://astrotube.obspm.fr/lazy-static/thumbnails/3e879873-2912-4b4d-929f-425057ee7881.jpgLERMA - Assemblée Générale Exceptionnelle - AGir 2023/03/14LERMA - Assemblée Générale Exceptionnelle - AGir 2023/03/14https://astrotube.obspm.fr/static/streaming-playlists/hls/47f1c0a9-f97b-4c0d-9252-8dcb854d1bef/a519bcec-e22f-4047-870a-854ad0a313de-master.m3u8https://astrotube.obspm.fr/videos/embed/9TgKWZrvmEyXhRbYjXASKH25350212023-03-15T16:34:46.808ZYESMain adoussot channelNOhttps://astrotube.obspm.fr/w/nBFUkEgYx7DLTx3jzP37jkhttps://astrotube.obspm.fr/lazy-static/thumbnails/6e207c2d-e995-4b72-9905-62f3b8174954.jpgPremier escape gamePremier escape gamehttps://astrotube.obspm.fr/static/streaming-playlists/hls/af0b88d7-48eb-4bfb-92e8-5c399a2f015f/3df5e5fe-c0b2-46aa-ae84-529d5f93ac75-master.m3u8https://astrotube.obspm.fr/videos/embed/nBFUkEgYx7DLTx3jzP37jk30330192023-03-16T19:12:11.208ZYESEscape GameNOhttps://astrotube.obspm.fr/w/4jTcLDXZZDTvAMWvhWY4dyhttps://astrotube.obspm.fr/lazy-static/thumbnails/9a7430d6-7d20-4f8c-845e-4a776d764dae.jpgEffective field theories of black hole perturbations Speaker: Luca Santoni (APC)I will discuss applications of effective field theories to black holes. I will first review the derivation of an effective theory for the perturbations of black holes in the context of scalar-tensor theories and its application to the study of their spectrum of quasi-normal modes. I will introduce a novel analytical approach to estimate the quasi-normal frequencies, which generalizes the well-known WKB approach by Schutz and Will to cases where the equations for the perturbations are coupled. I will then discuss the symmetries that are responsible for the vanishing of the Love number couplings (i.e., the coefficients of the conservative static tidal response) in the point-particle effective theory of black holes in general relativity.https://astrotube.obspm.fr/static/streaming-playlists/hls/1aee5bd8-1d31-4c60-8080-b6764e9ec7a4/1c6b210a-da1f-4287-afde-7891ec8a2794-master.m3u8https://astrotube.obspm.fr/videos/embed/4jTcLDXZZDTvAMWvhWY4dy4102052023-03-30T11:42:44.226ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/p54h6292X2332Yb38jhkCihttps://astrotube.obspm.fr/lazy-static/thumbnails/172fab02-40dd-42e7-bdf7-74d4a85b9896.jpgPablo Bosch: Nonlinear Effects in the Black Hole Ringdown: Absorption-Induced Mode ExcitationGravitational-wave observations of black hole ringdowns are commonly used to characterize binary merger remnants and to test general relativity. These analyses assume linear black hole perturbation theory, in particular that the ringdown can be described in terms of quasinormal modes even for times approaching the merger. Here we investigate a nonlinear effect during the ringdown, namely how a mode excited at early times can excite additional modes as it is absorbed by the black hole. This is a third-order secular effect : the change in the black-hole mass causes a shift in the mode spectrum, so that the original mode is projected onto the new ones. Using nonlinear simulations, we study the ringdown of a spherically-symmetric scalar field around an asymptotically anti-de Sitter black hole, and we find that this « absorption-induced mode excitation » (AIME) is the dominant nonlinear effect. We show that this effect takes place well within the nonadiabatic regime, so we can analytically estimate it using a sudden mass-change approximation. Adapting our estimation technique to asymptotically-flat Schwarzschild black holes, we expect AIME to play a role in the analysis and interpretation of current and future gravitational wave observations.https://astrotube.obspm.fr/static/streaming-playlists/hls/bad32f1a-b17f-4ee9-a802-2a4c64493665/feb40733-2cc6-4289-b580-cbec3185bfac-master.m3u8https://astrotube.obspm.fr/videos/embed/p54h6292X2332Yb38jhkCi35510102023-04-06T11:20:39.794ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/j28Ara3oLk6zNGZWRvWJsihttps://astrotube.obspm.fr/lazy-static/thumbnails/c84f58f5-e24b-40df-8e8b-8d93bad728db.jpgLa Tête dans les Étoiles - 16 - La comète C/2022 E3 (ZTF)La Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 16 : la comète C/2022 E3 (ZTF)https://astrotube.obspm.fr/static/streaming-playlists/hls/91eceb5f-6566-4b67-aed2-b3951e3008bd/20e3bbf2-d3d6-4a71-a288-c91c307addd2-master.m3u8https://astrotube.obspm.fr/videos/embed/j28Ara3oLk6zNGZWRvWJsi182072023-04-08T11:16:18.314ZcometeastronomieztfYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/chuv4mPmqKM4o5ssk7vYZphttps://astrotube.obspm.fr/lazy-static/thumbnails/561a2d5e-1ad2-4f2c-b65c-9d6e542f2a7f.jpgLa Tête dans les Étoiles - 17 - La constellation d'OrionLa Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 17 : la constellation d'Orionhttps://astrotube.obspm.fr/static/streaming-playlists/hls/5b61fd6c-fcd1-4e7a-86c8-136c73b4a429/a136dab1-1a72-4fe6-a045-ca97a8432bf0-master.m3u8https://astrotube.obspm.fr/videos/embed/chuv4mPmqKM4o5ssk7vYZp152572023-04-08T15:07:13.350ZbellatrixrigelorionastronomieYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/qHKbiZRBunP69nxRiDGJLVhttps://astrotube.obspm.fr/lazy-static/thumbnails/49c28707-185e-49cd-bd02-51a7e08e9a9a.jpgLa Tête dans les Étoiles - 19 - Les nébuleuses d'OrionLa Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 19 : les nébuleuses d'Orionhttps://astrotube.obspm.fr/static/streaming-playlists/hls/c82f6e80-c119-4c9b-a21f-055300527405/6d9b2bf7-1a15-420a-ba2a-9abd27a7c6e3-master.m3u8https://astrotube.obspm.fr/videos/embed/qHKbiZRBunP69nxRiDGJLV156072023-04-08T15:09:38.082ZastronomieorionnébuleusesYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/x8bFAisgp1pfLFVD4ekziphttps://astrotube.obspm.fr/lazy-static/thumbnails/4e833f13-aaca-40e5-bfa5-9054bb2408b6.jpgLa Tête dans les Étoiles - 18 - BételgeuseLa Tête dans les Étoiles, tous les samedis à 7h25 en 2022-2023 sur France Bleu Roussillon. Épisode 18 : Bételgeuse ❤️https://astrotube.obspm.fr/static/streaming-playlists/hls/fc0c1697-0997-4698-b13e-3c55b2abb3fd/eaa9f4ad-ab91-4a0c-89d1-0ed9b4c3d487-master.m3u8https://astrotube.obspm.fr/videos/embed/x8bFAisgp1pfLFVD4ekzip1820132023-04-08T15:12:44.580ZbetelgeuseorionastronomieYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/3XM9UetrqpYvDKFjguyiBghttps://astrotube.obspm.fr/lazy-static/thumbnails/b09386fd-12e0-4021-870d-28b192649db7.jpgLa Tête dans les Étoiles - 23 - La Station Spatiale InternationaleLa Tête dans les Étoiles, tous les samedis à 8h40 en 2022-2023 sur France Bleu Roussillon. Épisode 23 : La Station Spatiale Internationalehttps://astrotube.obspm.fr/static/streaming-playlists/hls/17fc02f0-299a-45e5-bf88-1acdd98b1981/be380d2f-67e6-4b68-b99e-ae890dbbbb47-master.m3u8https://astrotube.obspm.fr/videos/embed/3XM9UetrqpYvDKFjguyiBg218082023-04-08T15:53:23.423Zissstation spatialeastronomieYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/q1aCamvdvRPGwW2byMAKJPhttps://astrotube.obspm.fr/lazy-static/thumbnails/9f2a9978-d938-4335-a848-184470f07c07.jpgLa Tête dans les Étoiles - 24 - Étoiles doublesLa Tête dans les Étoiles, tous les samedis à 8h40 en 2022-2023 sur France Bleu Roussillon. Épisode 24 : Étoiles doubleshttps://astrotube.obspm.fr/static/streaming-playlists/hls/c261422d-f805-4c86-bfd6-1d273bf7aadf/299863ab-2f5d-41e1-b47d-ebf92c001fc8-master.m3u8https://astrotube.obspm.fr/videos/embed/q1aCamvdvRPGwW2byMAKJP2210162023-04-09T11:08:27.944ZastronomiedoublesétoilesYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/3krEPpHxrgj5bWCivCfzonhttps://astrotube.obspm.fr/lazy-static/thumbnails/9cbc60b3-8bea-42ce-98d1-fb46aa1d8c3b.jpgLa Tête dans les Étoiles - 25 - L'ÉcliptiqueLa Tête dans les Étoiles, tous les samedis à 8h40 en 2022-2023 sur France Bleu Roussillon. Épisode 25 : L'Écliptiquehttps://astrotube.obspm.fr/static/streaming-playlists/hls/12e93a6b-1c11-4f53-a026-48a391db3c85/4a859a9f-27a6-4673-a1f1-0c0bd3e28bb4-master.m3u8https://astrotube.obspm.fr/videos/embed/3krEPpHxrgj5bWCivCfzon2300202023-04-09T16:46:42.665ZécliptiqueconstellationsastronomieYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/jTmViVbWR8g1q4RFbhjRXFhttps://astrotube.obspm.fr/lazy-static/thumbnails/df834e13-4fd7-48d2-9d34-9a1dd3073fbd.jpgMODELLING THE EXPLOSIVE EJECTION OF ORION BN/KL REGION; Speaker: Ary RodriguezOrion BN/KL is an example of a poorly understood phenomenon in star-forming regions involving the close encounters of young stellar objects. The explosive structure and dynamics, the energy involved in the event, and the mass of the region suggest a contribution to the motion in the interstellar medium. We explore an analytic/numerical model that takes into account the interaction of a clump with the environment. We show that the widespread kinematic ages of Orion’s fingers—500 to 4000 yr—are a consequence of the interaction of the explosion debris with the surrounding medium. This model explains satisfactorily the age discrepancy of Orion’s fingers and infers the initial conditions together with the lifetime of the explosion.https://astrotube.obspm.fr/static/streaming-playlists/hls/98f051ec-81f6-4a49-9c9b-8229c118c1d1/aae2c861-6452-42c7-ae62-1595c1b338fc-master.m3u8https://astrotube.obspm.fr/videos/embed/jTmViVbWR8g1q4RFbhjRXF3951022023-04-13T11:13:53.265ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/2WtJyKmgY8XsZ1njFTSv9shttps://astrotube.obspm.fr/lazy-static/thumbnails/0646c463-542b-4e8c-868e-4323c3cf127f.jpgLa Tête dans les Étoiles - 27 - Étoiles et planètesLa Tête dans les Étoiles, tous les samedis à 8h40 en 2022-2023 sur France Bleu Roussillon. Épisode 27 : Étoiles et planèteshttps://astrotube.obspm.fr/static/streaming-playlists/hls/0fb464d3-1b76-4ada-b34a-04e614b5475e/fe490028-ed1e-4588-a64f-b92d82f57295-master.m3u8https://astrotube.obspm.fr/videos/embed/2WtJyKmgY8XsZ1njFTSv9s173082023-04-15T15:24:03.593ZastronomieplanètesétoilesYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/ifqXLg7Pgx1X7mr9AdfQPehttps://astrotube.obspm.fr/lazy-static/thumbnails/9d4c721f-5972-46e4-882f-d7639acecd25.jpgLa Tête dans les Étoiles - 28 - Les galaxies du LionLa Tête dans les Étoiles, tous les samedis à 8h40 en 2022-2023 sur France Bleu Roussillon. Épisode 28 : Les galaxies du Lionhttps://astrotube.obspm.fr/static/streaming-playlists/hls/8baf272c-f092-40f5-b88d-063b106a0023/0096dc4a-a2f9-41af-a832-19405bc47172-master.m3u8https://astrotube.obspm.fr/videos/embed/ifqXLg7Pgx1X7mr9AdfQPe1850142023-04-22T23:07:16.839ZlionastronomiegalaxiesYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/9XVdSwpUWuMzKhNDbqFyohhttps://astrotube.obspm.fr/lazy-static/thumbnails/fb573e4f-e668-4330-aa2d-cde599d1bb71.jpgjean-marc Huré (Univ. Bordeaux, LAB) UNE THÉORIE APPROCHÉE POUR L’ÉQUILIBRE DES SPHÉROIDES IMBRI...Nous exposerons un formalisme vectoriel résolvant approximativement $\cal O(c)$ les configurations d’équilibre d’un fluide autogravitant hétérogène composé de $\cal L$ couches homogènes en rotation rigide et bordées par des sphéroides parfaits. Cette approche, basée sur un développement du potentiel gravitationnel sur le paramètre confocal $c$ (plutôt que sur l’ellipticité), permet des configurations très oblates, prolongeant ainsi les travaux classiques fin XIXe de l’école française (Poincaré, Hamy, etc.). Ces solutions analytiques sont validées par les résultats numériques obtenus par la méthode SCF du champ auto-cohérent, et par l’établissement de l’équation du Viriel associée. Nous aborderons éventuellement i) le passage à la limite continue $\cal L \rightarrow \infty$, ii) le cas de la rotation différentielle et iii) la question de structures internes pour la planète Jupiter réalisant les principales observables.https://astrotube.obspm.fr/static/streaming-playlists/hls/4897d0d8-5289-4bd5-b989-da736c5efba4/1cf87221-4a1e-4744-98fc-f57f3758baa3-master.m3u8https://astrotube.obspm.fr/videos/embed/9XVdSwpUWuMzKhNDbqFyoh34300232023-05-04T16:52:47.839ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/qX34YEpTjibDr1ixhgmLJJhttps://astrotube.obspm.fr/lazy-static/thumbnails/056f519d-962c-470d-ab69-554c1a40715c.jpgNATALIE HOGG (IPHT - CEA SACLAY) The weak lensing of strong lensing as a new cosmological probeLine-of-sight (LOS) effects in strong lensing — weak distortions to an image induced by the presence of objects such as dark matter haloes along the LOS — have long been considered a nuisance effect when it comes to analysing strong lensing images. However, it was recently proposed that LOS shear could become a cosmological observable in its own right, if it could be accurately obtained from a given image. After recapping gravitational lensing theory, in this talk I will show how, using a new formalism, the LOS shear can indeed be measured with percent level accuracy from simulated strong lensing images, paving the way for its development as a new cosmological probe. Based on 2210.07210.https://astrotube.obspm.fr/static/streaming-playlists/hls/ca0a828e-b3d8-45a9-ba63-f8ce33f3072e/99f59d83-02b2-47b6-9867-4935ef80fbcb-master.m3u8https://astrotube.obspm.fr/videos/embed/qX34YEpTjibDr1ixhgmLJJ3227022023-05-04T17:20:51.293ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/men8Ud6FABzdVRRyG4RoPKhttps://astrotube.obspm.fr/lazy-static/thumbnails/7fe65d0c-86b6-41ce-a6eb-976998c2e333.jpgLa Tête dans les Étoiles - 30 - François AragoLa Tête dans les Étoiles, tous les samedis à 8h40 en 2022-2023 sur France Bleu Roussillon. Épisode 30 : François Arago Pour aller plus loin : François Arago, un savant généreux, par James Lequeux, aux Éditions EDP Sciences Images : - La statue de François Arago sur la place de l'Île de Sein, en face de l'Observatoire de Paris, démolie par les Allemands en 1942 : https://bibliotheques-specialisees.paris.fr/ark:/73873/pf0002226024/0002? - Fresnel et ses lentilles : http://www.mathouriste.eu/Fresnel/Fresnel_Lentilles.html - Arago donnant son cours d'Astronomie Populaire, représenté sur l'un des neuf panneaux ornant l’escalier d’honneur de la Sorbonne (© Rectorat de Paris) : http://www.bibnum.education.fr/sites/default/files/analyse-142-lune.pdfhttps://astrotube.obspm.fr/static/streaming-playlists/hls/a3d477c5-c835-4d20-9dd3-52ce859b7b41/4b09f7ff-22d7-4b61-98a6-da3dd1ea9de1-master.m3u8https://astrotube.obspm.fr/videos/embed/men8Ud6FABzdVRRyG4RoPK2660212023-05-08T13:37:23.585Zfrançois aragoastronomieYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/vw2Kj2f2rQugPR7Lsjv51xhttps://astrotube.obspm.fr/lazy-static/thumbnails/82d0a5af-b2d0-414d-a212-5a4f33698496.jpgSPIND DOWN BY DYNAMO ACTION IN SIMULATED RADIATIVE STELLAR LAYERS; Ludovic Petitdemange (LERMA) The evolution of a star is influenced by its internal rotation dynamics through transport and mixing mechanisms, which are poorly understood. Magnetic fields can play a role in transporting angular momentum and chemical elements, but the origin of magnetism in radiative stellar layers is unclear. Using global numerical simulations, we identify a subcritical transition to turbulence due to the generation of a magnetic dynamo. Our results have many of the properties of the theoretically-proposed Tayler-Spruit dynamo mechanism, which strongly enhances transport of angular momentum in radiative zones. It generates deep toroidal fields that are screened by the stellar outer layers. This mechanism could produce strong magnetic fields inside radiative stars, without an observable field on their surface. Magnetic fields generated by dynamo action appear as a process to trigger turbulence in stellar interiors. Depending on the parameters or initial conditions, we report different dynamo branches that could explain stellar magnetism and the rotation profiles observed for stars with a thick radiative envelope. https://astrotube.obspm.fr/static/streaming-playlists/hls/ef0a6923-ea2b-44e0-a04c-2a7441a8cd97/90f11cce-2878-48e1-a918-43bb54a98641-master.m3u8https://astrotube.obspm.fr/videos/embed/vw2Kj2f2rQugPR7Lsjv51x4009092023-05-11T12:07:02.268ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/bSbpxv1eGUMPJJuGWzHyPWhttps://astrotube.obspm.fr/lazy-static/thumbnails/f3de7f91-e048-4fb8-b19a-6ba550b694b1.jpgLa Tête dans les Étoiles - 31 - Les Étoiles PolairesLa Tête dans les Étoiles, tous les samedis à 8h40 en 2022-2023 sur France Bleu Roussillon. Épisode 31 : Les Étoiles Polaireshttps://astrotube.obspm.fr/static/streaming-playlists/hls/57fcfceb-d02c-4e4e-9f8e-89f9c9401094/e9782eee-b3d4-4e84-a6d9-91f990d99a55-master.m3u8https://astrotube.obspm.fr/videos/embed/bSbpxv1eGUMPJJuGWzHyPW2690102023-05-13T11:07:55.156Zétoiles polairespolarisastronomieYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/3AjzhzzoQYYV3pamqz39fwhttps://astrotube.obspm.fr/lazy-static/thumbnails/d557508f-5a6e-46cc-bf75-dd77bfac28fa.jpgStarbursts and AGNs: factories of ultra-high-energy cosmic rays?, speaker: Ana Muller (ELI Beamli...Active galactic nuclei and starburst galaxies have been pointed out as the most promising sources for producing ultra-high-energy cosmic rays. In this talk, I will discuss the feasibility of accelerating particles up to the highest energies in starburst galaxies and AGN jets. In particular, I will present results for the acceleration of particles in the large-scale shocks of the superwinds of starburst galaxies and show a scenario in which cosmic rays could be generated in multiple shocks created by the interaction of relativistic AGN jets with stars.https://astrotube.obspm.fr/static/streaming-playlists/hls/14fd0316-f028-47d9-8b94-e75968a0514a/5c8c34d0-d3c4-405f-a145-686f071ca858-master.m3u8https://astrotube.obspm.fr/videos/embed/3AjzhzzoQYYV3pamqz39fw4265022023-05-25T12:20:17.477ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/1MgSUdHLg8ABisVDimApFGhttps://astrotube.obspm.fr/lazy-static/thumbnails/c2b65e56-400c-4eb8-a37b-e2cd3e99664f.jpgMILEVA ET ALBERT EINSTEIN par Suzy Collin-Zahn,Cet exposé est le résumé d’un essai que j’ai publié à propos de Albert Einstein et de sa première épouse, Mileva Maric. Fascinée par son l’histoire tragique, j’ai fait des recherches qui m’ont révélé une intimité d’Albert contrastant avec l’image d’humaniste que lui avait procuré son engagement public. J’ai tenté alors de comprendre comment avait pu se produire dans un amour qui semblait indéfectible une terrible cassure mise en évidence par la disparition complète du nom de Mileva dans tous les propos d’Einstein. L’explication tient à mon avis au caractère d’Albert et à un évènement volontairement caché pendant plus de trente ans après sa mort. Après leur séparation, Mileva a eu une vie très difficile, en grande partie à cause de la schizophrénie de leur fils cadet dont elle s’est occupée seule pendant trente ans. Sans me prononcer sur l’influence que Mileva a pu avoir sur les travaux d’Albert, j’expose des faits basés essentiellement sur les archives de courriers entre eux ou avec des amis. Je laisse l’auditeur se faire une opinion personnelle sur le caractère de l’immense scientifique qu’a été Albert, qui aurait pu permettre à Mileva d’avoir un destin moins dramatique s’il avait été différent.https://astrotube.obspm.fr/static/streaming-playlists/hls/0652412b-1613-481d-b179-d56617e3d92a/8e305ce1-5b6a-4403-9ac1-65fb9429768f-master.m3u8https://astrotube.obspm.fr/videos/embed/1MgSUdHLg8ABisVDimApFG30020872023-06-01T10:16:47.299ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/wgV7nrihxiBqjwhbHwEkMshttps://astrotube.obspm.fr/lazy-static/thumbnails/c255b546-f7cc-4d49-9975-855b9bf771da.jpgMMulti-wavelength light-curve fitting of young and millisecond pulsars, Speaker : Jérome PétriSince the launch of the Fermi/LAT gamma-ray telescope, several hundred radio-loud gamma-ray pulsars have been detected, many belonging to millisecond pulsars but some also to the young pulsar population (spin periods longer than 30 ms). Observing simultaneously pulsed radio and gamma-ray emission from these stars helps to constrain the geometry and radiation mechanisms within their magnetosphere and to localize the photon production sites. In this presentation we show how time-aligned gamma-ray light curve fitting of young and millisecond pulsars constrains their magnetospheric configuration, namely the magnetic axis and line-of-sight inclination angles. To this end, we assume a dipolar force-free magnetosphere where radio photons emanate from high altitudes above the polar caps and gamma-rays originate from the pulsar striped wind region. Further constraints were obtained from radio polarization measurements, if available, following the rotating vector model, including aberration and retardation effects. We find a good agreement between our emission model and the time-aligned single- or double-peaked gamma-ray pulsar observations. We deduce the magnetic inclination angle and the observer line-of-sight with respect to the rotation axis within a small error bar. We are currently extending our analysis to the thermal and non-thermal X-ray emission using observations from NICER, NuSTAR, RXTE and XMM. Moreover the recent launch of the IXPE polarimeter is opening a new window to better understand the physics of the X-ray mechanisms and propagation within the magnetosphere. In a last part, we discuss the strength of pulsar population synthesis to put constraints on the neutron star evolution properties, from their birth place to their current position.https://astrotube.obspm.fr/static/streaming-playlists/hls/f52b0be3-7532-474e-b43b-1c8f8c8764e8/13909399-649a-4f01-9bf5-d5e955a6ba5d-master.m3u8https://astrotube.obspm.fr/videos/embed/wgV7nrihxiBqjwhbHwEkMs3685032023-06-15T12:21:19.104ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/5pokpNznZjqzFeeWfa9i5Shttps://astrotube.obspm.fr/lazy-static/thumbnails/9d46c829-1f80-4379-ab82-d3260637cf91.jpgSpider Binary Pulsars and Extreme Physics; Speaker: Prof. Rene Breton (The University of Manches...Since the discovery of neutron stars (NSs) as pulsating sources ∼50 years ago, pulsars have become the perfect laboratories to test the boundaries of theoretical physics, thanks to the extreme astrophysical environments they thrive in. Arguably the most useful of them are millisecond pulsars, extreme neutron stars that have been spun-up to millisecond spin periods by accreting matter from an orbiting companion star, as the measurement of their orbital dynamics allows us to investigate their evolution and test gravity theories. Among them are the “spiders”, a subclass of binary millisecond pulsars with low-mass semi-degenerate companions which are in the process of being ablated by the pulsar, leading to them being named after the deadly “black widows” and “redbacks”. In the last decade, the number of known spiders has grown by over an order of magnitude. They have since been linked to transitional millisecond pulsars which are believed to provide the missing link between binary pulsars and low-mass X-ray binaries. In this talk I will review some of the recent science developments enabled by this growing population, including the quest for measurement neutron star masses, finding the fastest spinning pulsars in our Galaxy and study the role of magnetic fields in accretion physics.https://astrotube.obspm.fr/static/streaming-playlists/hls/23a86cf2-72da-493f-badc-e9066ace970e/d13ce3c0-6873-41b7-b545-d8b9f908bb5b-master.m3u8https://astrotube.obspm.fr/videos/embed/5pokpNznZjqzFeeWfa9i5S41080162023-06-15T13:04:19.427ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/4D3hVLHJe4TeEnyy8Wt3cChttps://astrotube.obspm.fr/lazy-static/thumbnails/1936d63e-2199-4a23-b1fc-02be3726306c.jpgGamma-ray evidence for a jet–orbit misalignment in the X-ray binary Cyg X-3, Anton DmytriievCyg X-3 is a high-mass X-ray binary, and is the only system in the Milky Way consisting of a Wolf-Rayet star and a compact object. The nature of the compact object (neutron star / black hole) is still unclear. Despite numerous studies, Cyg X-3 remains a unique and puzzling system. In our study, we present a detailed physical modeling of Cyg X-3 gamma-ray data, allowing us to drastically improve our understanding of this complex system. We perform fitting of the gamma-ray spectrum and light curve with our complex physical model and firmly establish that the jet of the compact object has to be inclined with respect to the orbital axis. Additionally, we test for the first time the predictions of General Relativity (GR) for the precession of the inclined jet in the system and find the predictions for the black hole compact object hypothesis in disagreement with the 50-year-long sample of observational data in the radio band. Finally, we incorporate in our data set available infrared (IR) measurements that constrain the synchrotron emission from the jet and its modulation, and test a physical scenario where the jet is bent and is precessing due to the influence of the stellar wind, as well as is bent by the Coriolis force. https://astrotube.obspm.fr/static/streaming-playlists/hls/1d77590e-0982-4436-aaf5-da02b0e47ce2/172eba8b-2773-48a4-8e39-ee6848b11f1b-master.m3u8https://astrotube.obspm.fr/videos/embed/4D3hVLHJe4TeEnyy8Wt3cC3090042023-06-22T10:50:45.220ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/f9SxoEzzc2bBvc5KjXAKQvhttps://astrotube.obspm.fr/lazy-static/thumbnails/4b627fb1-10e3-4dd0-b1da-e5eb85110c2f.jpgFast Radio Burst by a geometrical modelGeneration of Fast Radio Bursts (FRBs) by emitting elements streaming along a corotating magnetic field line in a neutron-star magnetosphere according to the geometrical model in [Voisin 2023](https://doi.org/10.1051/0004-6361/202346544). This is an expanded and animated version of Fig. 6 in [Voisin 2023](https://doi.org/10.1051/0004-6361/202346544) (arXiv:2306.01336 hal-04113116). Left: Propagation of emitting elements along a magnetic field line as a functinon time t. The local section of line is projected onto the plane (x,y) orthogonal to the rotation axis. Black crosses on the line represent the edges of the so-called visible segment, which is the section of line where an element emitting in a fixed cone can be seen by an observer located in the direction pointed to by the arrow at the top-right corner. The grey cross represents the characteristic position of the segment. Emitting elements are travelling along the line and are represented by circles. The size of a circle represents the intrinsic intensity of the element, that is its total flux integrated over all directions. Emitting elements are injected on the line with intensities following a sequence of three Gaussian temporal profiles. The colour of an element represents the flux received by the observer from 0 (blue) to maximum (green). We note that each emitting element emits in the forward direction according to a Gaussian angular profile and are therefore also visible when outside of the visible segment (which corresponds to fixed cone) albeit too weakly to be noticeable in this case. Right: Dynamic spectrum representing observation frequency (in arbitrary units) versus time of arrival. Each burst component corresponds to the passing of one Gaussian injection profile (see above).https://astrotube.obspm.fr/static/streaming-playlists/hls/729d09dd-55a5-448e-a04e-73ee5a06ecc9/04edaf98-26b9-47b1-9ff2-c76dddfbc120-master.m3u8https://astrotube.obspm.fr/videos/embed/f9SxoEzzc2bBvc5KjXAKQv85232023-06-22T15:18:50.643ZYESMain gvoisin channelNOhttps://astrotube.obspm.fr/w/xoGkhahoYMRUsTyJxo7kkchttps://astrotube.obspm.fr/lazy-static/thumbnails/7d074fe1-05ee-4c6c-88b0-292c497c7ebb.jpgComment fabriquer de l’or avec deux étoiles à neutrons ?La fusion de deux étoiles à neutrons se produit lorsque les deux étoiles en orbite l’une autour de l’autre se rapprochent de plus en plus jusqu’à entrer en collision. Ce processus s’accompagne entre autres de l’émission d’ondes gravitationnelles et d’une contrepartie électromagnétique, dont un sursaut de rayonnement gamma. Ces différents signaux ont été détectés pour la première fois par différents observatoires (au sol et en orbite) en août 2017. La mise en commun des données collectées a permis d’identifier la fusion d’étoiles à neutrons comme un nouveau site où l’or et les éléments plus lourds présents dans l’Univers sont produits. La conférence mettra en lumière les différents aspects de ce phénomène extraordinaire en abordant des notions couvrant les domaines de l’astrophysique, de la relativité générale et de la physique nucléaire. Orateurs : Nicolas Arnaud (IJCLab) Eric Gourgoulhon (LUTH, Observatoire de Paris) Micaela Oertel (LUTH, Observatoire de Paris)https://astrotube.obspm.fr/static/streaming-playlists/hls/fe368461-dafc-4a77-83c9-f2836e5e8e35/2146899b-c3b9-4008-9d49-ecf4ce789edf-master.m3u8https://astrotube.obspm.fr/videos/embed/xoGkhahoYMRUsTyJxo7kkc6960592023-07-07T07:42:15.694ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/w6ECS36h9dnJKdypqHykNNhttps://astrotube.obspm.fr/lazy-static/thumbnails/e02bfefb-1aa6-4f08-b8c8-0faaf4832e30.jpgÉnigmatique trou noirLes trous noirs sont des astres tellement compacts que même la lumière ne peut leur échapper. Tout ce qui s’en approche trop est condamné a y être englouti. Si l’existence de ces objets est prédite depuis plus de 100 ans par la théorie de la relativité générale d’Einstein, ils ont tout d’abord été cantonnés au statut de curiosité mathématique. Toutefois, peu a peu, les trous noirs sont sortis de l’ombre ; les preuves observationnelles de leur existence étant de plus en plus convaincantes. A ce titre les dernières années ont été particulièrement fructueuses avec les observations à haute résolution des disques de matière autour de trous noirs ainsi que celles des ondes gravitationnelles émises lors de la fusion de deux tels objets. Après une mise en perspective historique, cette conférence présentera l’état de nos connaissances sur la physique des trous noirs, se basant principalement sur les dernières observations en date. Orateurs : Philippe Grandclément (Observatoire de Paris, PSL) Alexandre Le Tiec (Observatoire de Paris, PSL)https://astrotube.obspm.fr/static/streaming-playlists/hls/f3bcb04c-22e6-449a-a0b4-467b1d9b4196/5400ea4c-3929-4ebd-955b-79bc550d4756-master.m3u8https://astrotube.obspm.fr/videos/embed/w6ECS36h9dnJKdypqHykNN68750122023-07-07T08:23:53.773ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/vLefMkpqAWYMfoRs2fGQsBhttps://astrotube.obspm.fr/lazy-static/thumbnails/8b32cca8-3827-4c54-a2ca-59f1b80b0ed0.jpgVIDEO FORMATION GALEXY UTILISATEURSVIDEO FORMATION GALEXY UTILISATEURShttps://astrotube.obspm.fr/static/streaming-playlists/hls/f105ea65-ba2f-4394-88ca-3755b494fa87/977479ac-5335-40f5-a90a-ccdf51c9a29a-master.m3u8https://astrotube.obspm.fr/videos/embed/vLefMkpqAWYMfoRs2fGQsB10240042023-07-24T10:05:58.759ZYESformation galexy utilisateurs et fonctionnalitesNOhttps://astrotube.obspm.fr/w/j9Y2FDbmDsy1E9bUBrBwQnhttps://astrotube.obspm.fr/lazy-static/thumbnails/3606ce2e-59c9-4596-b932-6025e9e047a4.jpgVIDEO FORMATION GALEXY FONCTIONNALITÉSVIDEO FORMATION GALEXY FONCTIONNALITÉShttps://astrotube.obspm.fr/static/streaming-playlists/hls/9304f9a3-a864-44a3-a2c3-4c273fd65615/f50479ca-9ef0-4f70-adfb-f7d54df4720d-master.m3u8https://astrotube.obspm.fr/videos/embed/j9Y2FDbmDsy1E9bUBrBwQn7869062023-07-24T10:43:31.725ZYESformation galexy utilisateurs et fonctionnalitesNOhttps://astrotube.obspm.fr/w/jgdYPvDEhRKmjzccZeasyrhttps://astrotube.obspm.fr/lazy-static/thumbnails/cca9b3a2-1416-4f08-813b-1a21238ef1da.jpgetape 1etape 1https://astrotube.obspm.fr/static/streaming-playlists/hls/93e4a6c3-4d4f-4564-8aa7-001f896bc819/38a2c0cb-d15f-473c-8e16-7b43d3dc3ce0-master.m3u8https://astrotube.obspm.fr/videos/embed/jgdYPvDEhRKmjzccZeasyr7302032023-07-24T15:32:00.254ZYESformation galexy utilisateurs et fonctionnalitesNOhttps://astrotube.obspm.fr/w/54N4J23p5s3f7yzFuBPL2Bhttps://astrotube.obspm.fr/lazy-static/thumbnails/d3334503-2c6b-4d55-b0ff-a50dd1b72bd1.jpgétape 2étape 2https://astrotube.obspm.fr/static/streaming-playlists/hls/20ec2c8d-494c-4749-867f-85b1c095a8d5/ec9db2e9-276b-4cba-91aa-b0bc0093d24a-master.m3u8https://astrotube.obspm.fr/videos/embed/54N4J23p5s3f7yzFuBPL2B6801012023-07-24T16:45:48.419ZYESformation galexy utilisateurs et fonctionnalitesNOhttps://astrotube.obspm.fr/w/rsLoikUARcFJ28yBYy2NzLhttps://astrotube.obspm.fr/lazy-static/thumbnails/eea2f46d-1ef7-4f43-94b1-04aca242da9c.jpgSylvain_Cetre: Durham Adaptive OpticsSylvain_Cetre: Durham Adaptive Opticshttps://astrotube.obspm.fr/static/streaming-playlists/hls/ce31284c-9762-4f74-8cf9-218735baf706/d0815b90-edf7-43c8-977d-c3f569cb8fa8-master.m3u8https://astrotube.obspm.fr/videos/embed/rsLoikUARcFJ28yBYy2NzL938072023-08-21T08:29:06.239ZYESMain sevin channelNOhttps://astrotube.obspm.fr/w/gubPFQ4g6r3JuCZVQdmBw2https://astrotube.obspm.fr/lazy-static/thumbnails/f1c06f0f-37d7-44c3-8f65-bc9df4c78c05.jpgLa Tête dans les Étoiles - 45 - Les Perséïdes, la Lune et SaturneLa Tête dans les Étoiles, tous les dimanches à 9h30 en 2022-2023 sur France Bleu Roussillon. Épisode 45 : le ciel à l'oeil nu fin août 2023.https://astrotube.obspm.fr/static/streaming-playlists/hls/7d68932a-8c49-483b-9ee7-6d5b6fd68e59/facfcb02-c45e-4719-9a4b-e2fd9c767d8f-master.m3u8https://astrotube.obspm.fr/videos/embed/gubPFQ4g6r3JuCZVQdmBw22000192023-08-24T20:07:11.907ZastronomieperséïdeslunesaturneYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/tLvEsNnwoAp4k3DsHfHiDUhttps://astrotube.obspm.fr/lazy-static/thumbnails/f98afc7b-e70e-4d31-9293-c4554a77b17c.jpgDu Big Bang au CERNIl y a près de 13 milliards d’années, notre univers est né, mais ce n’est que depuis le siècle dernier que la théorie du « Big Bang » a été élaborée pour expliquer sa naissance et son évolution. Cette théorie affirme que l’Univers était extrêmement dense et chaud à ses débuts, et qu’il s’est ensuite étendu. En 1964, la découverte d’un rayonnement fossile, libéré environ 380 000 ans après le Big Bang, a validé cette évolution. Mais bien avant cela, lors des premières secondes et minutes de la vie de l’Univers primordial, la théorie du Big Bang prévoit l’apparition des briques élémentaires de la matière que nous connaissons aujourd’hui. Ces prédictions ont été confirmées grâce à des expériences menées sur des accélérateurs de particules, tels que ceux utilisés au CERN. L’objectif de cette conférence est de vous faire découvrir les avancées de notre compréhension de l’Univers depuis le Big Bang astrophysique, ainsi que l’étude des briques élémentaires de la matière en laboratoire, notamment au CERN. Ne manquez pas cette occasion unique d’explorer les profondeurs du cosmos et de plonger dans les découvertes révolutionnaires qui ont façonné notre vision de l’univers et de la matière elle-même. Rejoignez-nous le 14 septembre 2023 pour une expérience scientifique fascinante ! Conférenciers : – Reina Coromoto Camacho Toro (Laboratoire de Physique Nucléaire et de Hautes Énergies, Paris) – Cyril Pitrou (Institut d’Astrophysique de Paris) – Antonin Maire (Institut pluridisciplinaire Hubert Curien, Strasbourg).https://astrotube.obspm.fr/static/streaming-playlists/hls/e0ddc010-f2cc-4e4a-981f-e760868840e2/78b93893-8d43-42d8-8e38-06ef8c72328e-master.m3u8https://astrotube.obspm.fr/videos/embed/tLvEsNnwoAp4k3DsHfHiDU82250182023-09-15T10:53:07.564ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/r9cBrAYQJp9ge7grAkrsAHhttps://astrotube.obspm.fr/lazy-static/thumbnails/e468d9b1-c95f-440e-839e-7b01486dc168.jpgBinary Neutron Star Mergers in the Multi-Messenger Era : Very High Energy Afterglows and Progenit...In this seminar, I will present recent results concerning the analysis of gamma-ray bursts (GRB) afterglows and on the formation of binary neutron stars (BNSs). I will show a new model of the very high energy emission of GRB afterglows from the synchrotron self-Compton radiation of laterally-structured jets, and make predictions for GW 170817-like events. Concerning the formation of BNSs, I will present results obtained with population synthesis, that show an evolution of the dominant progenitors evolutionary tracks with redshift.https://astrotube.obspm.fr/static/streaming-playlists/hls/cb99927d-9ccd-4585-9bb6-ee1bcbea009d/d0ee98ce-fc9e-4bd0-925d-809fac32d6e6-master.m3u8https://astrotube.obspm.fr/videos/embed/r9cBrAYQJp9ge7grAkrsAH4207042023-09-15T12:00:46.156ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/2NUDJNXf2zCQUMZcFLjygfhttps://astrotube.obspm.fr/lazy-static/thumbnails/d888abb2-02e4-4174-963e-8238c71e23a3.jpgInteracting supernovae, orateur: LUC DESSART (IAP)High-cadence long-term monitoring of the transient sky suggests that most core-collapse supernovae are influenced at some level by interaction with circumstellar material (CSM). Although considered so far a feature in core-collapse supernovae, this observation has led theorists to revise the idealized view of massive star evolution and explosion, and consider additional time-dependent, dynamical, and multi-dimensional effects that remain today poorly understood. In this talk, I will review the basic features of massive star evolution, the ultimate gravitational collapse of their degenerate core, their explosion as supernova, and the subsequent evolution of the ejecta and radiation properties (i.e., light curves and spectra). I will then describe the variety of signatures that are suggestive of ejecta interaction with CSM and how we can model the radiation and the dynamics of these events. I will consider various configurations for the CSM, including when it is dense but confined to the direct vicinity of the star, when it is dense but extended, when the CSM is more massive than the ejecta that strike it, and finally when the CSM is very distant and gives rise to delayed interaction when the ejecta have expanded for a year or more. https://astrotube.obspm.fr/static/streaming-playlists/hls/0ea5cc98-60e1-470b-bac8-617fd0fce924/f55de86f-9615-4ca1-9a53-df4458eea830-master.m3u8https://astrotube.obspm.fr/videos/embed/2NUDJNXf2zCQUMZcFLjygf4777092023-10-19T12:53:29.217ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/mSLVsFyJtNpsXrqA1sFgEthttps://astrotube.obspm.fr/lazy-static/thumbnails/ca225c46-c888-44b1-9bd7-04d413d1d785.jpgWebinar ASNUM 16/10/23: Astrophysics from star formation to cosmology scales with RAMSES across t...Jérémy Blaizot (CRAL) & Joakim Rosdahl (CRAL) Astrophysics from star formation to cosmology scales with RAMSES across the globe RAMSES is a publicly available adaptive mesh refinement code used for a multitude of astrophysics problems over the last two decades by a growing community across the globe, and is one of the main codes used for cosmological simulations of galaxy formation. In this presentation, we begin by giving an overview of the history of the RAMSES code and its usage in a variety of science-cases ranging from sub-parsec to giga-parsec scales. We will then present and explain the newly established RAMSES SNO (Service National d’Observation), which will allow us to develop a service to the RAMSES community and make the code even more user-friendly for aspiring and established astrophysicists alike.https://astrotube.obspm.fr/static/streaming-playlists/hls/a90da54c-5a45-4a9d-8bf4-e05b0154fd0b/2870f2b1-fcdf-47e3-af73-2fb52490f7ab-master.m3u8https://astrotube.obspm.fr/videos/embed/mSLVsFyJtNpsXrqA1sFgEt31500352023-10-30T16:12:07.554ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/rSKRXUZDuZ7BMA9ZXJt5eKhttps://astrotube.obspm.fr/lazy-static/thumbnails/f8d7247d-9d70-49c6-b5ff-1e644c62ad59.jpgLa Tête dans les Étoiles - 56 - Occultation de Vénus et hommage à Hubert ReevesLa Tête dans les Étoiles, tous les dimanches à 7h15 en 2023-2024 sur France Bleu Roussillon. Épisode 56 : occultation de Vénus le 9 novembre 2023 et hommage à Hubert Reeves ATTENTION : les horaires données pour l'occultation correspondent à Perpignan (11h15-12h05). Pensez à vérifier les horaires chez vous (ex: pour Paris 10h55-11h55) : - Via le site de l'IMCCE : https://ssp.imcce.fr/forms/occultations/299/301/2023-11-09G - Ou avec Stellarium : https://stellarium.org Crédits photo Hubert Reeves : Georges Seguin.https://astrotube.obspm.fr/static/streaming-playlists/hls/d18aaf82-0943-4e32-80e6-7c4656c65c25/4b5e4737-00e6-4fa2-97a8-9efe9d78320b-master.m3u8https://astrotube.obspm.fr/videos/embed/rSKRXUZDuZ7BMA9ZXJt5eK2500252023-11-05T17:15:09.938Zhubert reevesoccultation de vénusYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/wyMcyRpeDBxdgboqvWFXfuhttps://astrotube.obspm.fr/lazy-static/thumbnails/b4166c6e-af84-47ef-b512-affc7d26f6ef.jpgLa Tête dans les Étoiles - 57 - Jupiter à l'oppositionLa Tête dans les Étoiles, tous les dimanches à 7h15 en 2023-2024 sur France Bleu Roussillon. Épisode 57 : l'opposition de Jupiter en 2023. Crédits photo : Club Astro de l'Observatoire de Paris (https://clubastro.obspm.fr) et NASA (missions Voyager et Juno)https://astrotube.obspm.fr/static/streaming-playlists/hls/f785d0c9-5ba8-4270-9579-f5f24328cb9c/506d4ae6-f6c4-45ab-a6c4-ebdfb24e84d2-master.m3u8https://astrotube.obspm.fr/videos/embed/wyMcyRpeDBxdgboqvWFXfu1710122023-11-12T09:55:24.687ZoppositionjupiterYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/hCk4e145JHHavdBXk9Nxfjhttps://astrotube.obspm.fr/lazy-static/thumbnails/cca4b3d9-7a82-40f1-a619-875cb4b30724.jpgTechniques and challenges for paleo-detectors, Orateur: CLAUDIO GALELLIIn this seminar, I will present what are paleo-detectors, how they work, and what they are useful for. I will show the base ideas for their employment in astroparticle physics, with specific cases for neutrino, dark matter, and cosmic ray physics. I will then outline the main challenges that arise in the proposals, in the choice of the target detectors and the measurable quantities. Finally I will briefly describe some personal lines of work.https://astrotube.obspm.fr/static/streaming-playlists/hls/86a4bcda-266a-4027-8d30-e8b1f09e526a/a424401f-76a8-46ee-9eb8-832c844d9942-master.m3u8https://astrotube.obspm.fr/videos/embed/hCk4e145JHHavdBXk9Nxfj4146042023-11-16T13:01:04.287ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/gELGEF36SnFGKSfLLBgxcphttps://astrotube.obspm.fr/lazy-static/thumbnails/dfafe502-93b4-437f-aef3-8be9c46e1540.jpgWebinar ASNUM 20/11/23: IdefixGeoffroy Lesur (IPAG) Idefix is a Godunov MHD finite volume code designed to run on accelerated supercomputers using the C++ Kokkos framework. In this webinar, I will discuss our motivations for creating a new code (in contrast to porting an existing one) and the path we followed. As the code is now public and is becoming more widely used, I will also illustrate the difficulties physicists encounter when using codes of this kind, and how to address them to maximize the transition of our communities to the new generation of accelerated machines.https://astrotube.obspm.fr/static/streaming-playlists/hls/7ee2e427-3300-4eba-9eb1-705d3dc880f9/39d60c9d-51e9-477e-b17c-3917a788ffd5-master.m3u8https://astrotube.obspm.fr/videos/embed/gELGEF36SnFGKSfLLBgxcp29145532023-11-20T15:07:00.510ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/3fXonpmNsxiJWPycty9Tcnhttps://astrotube.obspm.fr/lazy-static/thumbnails/bdfdecc4-ea8a-4726-9e56-d4076f60236b.jpgIntegrability and action-angle variables of binary black holes at second post-Newtonian order, Sa...Accurate and efficient modeling of binary black holes (BBHs) is crucial for the detection of gravitational waves (GWs) emitted by them. Closed-form solutions to these systems when they are in the initial inspiral phase are highly sought after and have been worked out by many groups in the post-Newtonian (PN) approximation. Most of these solutions are valid only in certain limits (small eccentricity, no spins, equal mass, etc.). Establishing the integrable nature of PN BBHs opens up the possibility of constructing closed-form solutions since integrability precludes chaos and guarantees the existence of action-angle variables. In this talk, I will discuss our series of efforts in establishing the integrable nature of the most general BBH system (arbitrary masses, spins, and eccentricity) as per the Liouville-Arnold theorem at 2PN order. I will also discuss our recently derived action-angle-based solution for these systems at 1.5PN order.https://astrotube.obspm.fr/static/streaming-playlists/hls/1248d29e-a97b-4f97-85dc-694776df3b9f/36cc0872-01c1-4908-83e8-4737e8f81b9d-master.m3u8https://astrotube.obspm.fr/videos/embed/3fXonpmNsxiJWPycty9Tcn3011082023-11-23T10:26:38.810ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/3nvzEpa3Edirvikzu3vvyFhttps://astrotube.obspm.fr/lazy-static/thumbnails/cb4f8ff7-c9ee-45c8-842d-903bda2cc606.jpgOn a more parsiminious general theory of relativity than General Relativity, OLIVIER MINAZZOLIIn this talk, we will explore entangled relativity, a general theory of relativity that offers a more parsimonious approach compared to general relativity when integrated within a quantum field theory framework. Requiring only two universal dimensionful parameters instead of three, entangled relativity retains the key components of general relativity, including a four-dimensional spacetime manifold, a metric tensor representing the mechanic al properties of space , inertia, and gravitation, and matter fields generating curvature. The term « entangled » does not directly refer to quantum entanglement but rather emphasizes that matter fields and gravity are intrinsically intertwined and cannot be treated separately at the level of the formulation of the theory. Entangled relativity converges toward, or reduces to, general relativity in most cases but predicts a variable quantum of action (ħ) in response to gravitational phenomena, particularly in dense environments like neutron stars or the early universe. After presenting and explaining the theory, I will present a few predictions that may become observable in the foreseeable future, and which do not depend on any theoretical parameter.https://astrotube.obspm.fr/static/streaming-playlists/hls/13332044-9e30-46c7-b81f-ed50babe5763/62cb4e88-7a35-435c-903b-6044202b3bd4-master.m3u8https://astrotube.obspm.fr/videos/embed/3nvzEpa3Edirvikzu3vvyF43110152023-11-23T13:33:48.550ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/cDJTcJJPipa8oQB2VqTXDKhttps://astrotube.obspm.fr/lazy-static/thumbnails/bfe4aa54-b51d-417f-9aa0-92580a90a8d3.jpgReevaluation of the Dynamical masses of Local Group galaxies, Speaker: Francois Hammer ( GEPI)In this talk, will review the recent progresses that our team has made using Gaia DR3 data. It includes the detection of a significant (Keplerian) decrease for the rotation curve of our Galaxy, and the fact that most Milky Way dwarfs are newcomers in the halo (as we already know for the Magellanic Clouds). Both discoveries lead to a considerable, downwards revision of the dynamical masses of Local Group galaxies, which will be presented. Finally, I’ll discuss possible consequences on cosmological models, as well as new observational hints that constrain the mass of dwarf irregular galaxies, such as WLM and the Large Magellanic Cloud.https://astrotube.obspm.fr/static/streaming-playlists/hls/5e5978e3-0323-437c-ba3f-396d4af5daa1/1367b301-4707-452a-8996-9a1e2fb0596a-master.m3u8https://astrotube.obspm.fr/videos/embed/cDJTcJJPipa8oQB2VqTXDK3576052023-11-30T14:15:07.325ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/9vCBvzpXy8eqFHW9LGo1aFhttps://astrotube.obspm.fr/lazy-static/thumbnails/39963b1d-539a-42ea-bf25-f7514115d93d.jpgThe present status of our knowledge about the highest-energy particles in Nature, Speaker: Antoni...In the era of the multi-messenger astronomy, ultra-high energy cosmic rays offer the unique opportunity to investigate the nature of astrophysical sources and of particle interactions in an energy range far beyond that covered by current particle accelerators. The Pierre Auger Observatory, the world's largest cosmic ray detector, combines in a hybrid design the information from fluorescence telescopes, observing the longitudinal profile of extensive air showers, with a surface array, measuring the lateral distributions of secondary particles at the ground. A review of selected results will be presented, focusing on the energy spectrum, nuclear mass composition measurements and anisotropies. In addition, some astrophysical models capable to connect parameters at the source to data at Earth will be detailed, including also studies on Starburst Galaxies and Galaxy Clusters.https://astrotube.obspm.fr/static/streaming-playlists/hls/44ec3de0-5aac-449b-a318-789a90f763a1/a779cc6a-20fc-4b40-a55a-a742b29b1e55-master.m3u8https://astrotube.obspm.fr/videos/embed/9vCBvzpXy8eqFHW9LGo1aF2656032023-12-07T12:41:27.167ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/rEB3JXCzWs9a7KvvkiFcHRhttps://astrotube.obspm.fr/lazy-static/thumbnails/8f28a6ca-5823-42f2-bdf7-bd8ea3c598a7.jpgConstraining ultra dense matter using Neutron Star’s observations, Oratrice : Lami SuleimanCompact stars have a crucial role to play in our understanding of ultra dense and isospin asymmetric matter. Born in the extremely bright explosion of a massive star at the last stage of its life, neutron stars can present masses as high as twice the mass of the Sun, in a radius of around ten kilometers, thus gathering matter in their interior in extreme conditions of density and gravity. The nuclear physics probed by observing neutron stars is complementary in terms of density and isospin asymmetry to any terrestrial experiment. Multi-messenger astronomy is used to extract information on the interior of neutron stars, their structure and their composition. Connecting the observation of macroscopic parameters to state of the art constraints on the equation of state of dense matter can be done via hydrostatics and hydrodynamics modelling in General Relativity. After a quick introduction to neutron star’s astrophysical features and how to model them within the theory of General Relativity, we will discuss how detection and theory of both neutron star astrophysics and nuclear physics can help us probe ultra dense matter. I will present publicly available software relevant to equation of state inference in the context of next generation of gravitational wave telescopes. Finally, we will show that almost equation of state independent relations that have been used to extract astrophysical features of neutron stars are partly irrelevant for gravitional wave signal detected with Cosmic Explorer and Einstein Telescope sensitivity.https://astrotube.obspm.fr/static/streaming-playlists/hls/cfd85411-d034-43df-a6a6-1b9fe2ef5fcf/e1f0dada-12d1-4ad6-a312-6ebdbbbeca4f-master.m3u8https://astrotube.obspm.fr/videos/embed/rEB3JXCzWs9a7KvvkiFcHR41350172023-12-14T13:26:29.251ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/wGk1MTkjaDysTnLbnwN5Sohttps://astrotube.obspm.fr/lazy-static/thumbnails/77bcb91a-3ff8-40cb-9f55-6239b80ea2f9.jpgUne merveilleuse année 2024Une merveilleuse année 2024https://astrotube.obspm.fr/static/streaming-playlists/hls/f893a0cf-dbc6-40ee-8f5a-2ab59c67c8aa/b23d52a4-72f1-462a-9468-77e90511b206-master.m3u8https://astrotube.obspm.fr/videos/embed/wGk1MTkjaDysTnLbnwN5So2701142023-12-20T13:51:59.725ZYESMain leste channelNOhttps://astrotube.obspm.fr/w/4rNeGFg9bFuHEFmDL895RHhttps://astrotube.obspm.fr/lazy-static/thumbnails/0e501645-63da-4b44-8304-a2c43b8956f1.jpgMimas : à la recherche de l'océan cachéAvec sa surface fortement cratérisée et dépourvue de signes d’activité, la lune de Saturne Mimas est le dernier endroit où l’on penserait découvrir un océan global sous sa surface. A partir d’une analyse fine de son mouvement orbitale, une équipe regroupant des chercheurs de l’Observatoire de Paris et du CNRS ont mis en évidence que, contre toute attente, Mimas possède un océan à seulement 20-30 km de profondeur. Celui-ci se serait formé il y a moins de 20 millions d’années. Cette découverte fait de Mimas une cible unique pour étudier les conditions primitives d’apparition de la vie.https://astrotube.obspm.fr/static/streaming-playlists/hls/1be5811b-0c3d-4a0d-b7f5-0ddb121b5443/f72e624a-3aa3-4ea6-ab33-f61abfc8922f-master.m3u8https://astrotube.obspm.fr/videos/embed/4rNeGFg9bFuHEFmDL895RH38901972023-12-21T16:01:40.218ZMécanique célesteMimasOcéanSaturneYESIMCCENOhttps://astrotube.obspm.fr/w/rDonwiiSi1jdHACBuJNSmahttps://astrotube.obspm.fr/lazy-static/thumbnails/e64b6acc-90ed-4476-8081-d106b5f16db4.jpgLa Tête dans les Étoiles - 63 - La veille de NoëlLa Tête dans les Étoiles, tous les dimanches à 7h15 en 2023-2024 sur France Bleu Roussillon. Épisode 63 : veille de Noël 2023. Crédits photos : - Nativité (Getty/iStock) - Vénus par la sonde Akatsuki (JAXA, https://akatsuki.isas.jaxa.jp/en/) - Captures du logiciel Stellarium (https://stellarium.org/fr/) - Le ciel du Chili, mouvement et filet d'étoiles (Miguel Montargès) - La Lune par le Club Astro de l'Observatoire de Paris (https://clubastro.obspm.fr) - Lever du croissant de Terre vu de la capsule Orion (Artemis I, NASA : https://www.youtube.com/watch?v=MzimIloHRs4) Musiques : - Sheila, les Rois Mages - Franck Sinatra, Fly me to the Moonhttps://astrotube.obspm.fr/static/streaming-playlists/hls/cfacc5cc-b6a3-4068-84c2-10f159160ba9/5082c517-fc5d-42f9-ae59-4d0651ccd6fe-master.m3u8https://astrotube.obspm.fr/videos/embed/rDonwiiSi1jdHACBuJNSma2175142023-12-24T13:58:08.413ZchansonsastronomienoëlYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/p4rNSqxjYYfF7mQiTPuvMbhttps://astrotube.obspm.fr/lazy-static/thumbnails/6cd354a2-2189-435a-8e03-3d6bc6ecf283.jpgMimas searching for the Hidden OceanWith its heavily cratered surface and no signs of activity, Saturn's moon Mimas is the last place you'd expect to find a global ocean beneath its surface. Based on a detailed analysis of its orbital motion, a team of researchers from Paris Observatory and CNRS have demonstrated that, contrary to all expectations, Mimas has an ocean at a depth of just 20-30 km. It is thought to have formed less than 20 million years ago. This discovery makes Mimas a unique target for studying the primitive conditions in which life first appeared.https://astrotube.obspm.fr/static/streaming-playlists/hls/babd5346-53a5-48c4-b86f-a1d09376f6c0/d5e67982-df11-4488-8575-acaf0c1ce423-master.m3u8https://astrotube.obspm.fr/videos/embed/p4rNSqxjYYfF7mQiTPuvMb3920322024-01-09T09:45:28.726ZMimassaturneiceoceanYESIMCCENOhttps://astrotube.obspm.fr/w/7xYpW1yMeuU64maMba84tMhttps://astrotube.obspm.fr/lazy-static/thumbnails/1e02a387-343e-49d9-a187-6fb6eb320449.jpg米玛斯寻找隐藏的海洋土星的卫星米马斯表面坑坑洼洼，没有任何活动迹象，是你最不可能在其表面下发现全球海洋的地方。根据对其轨道运动的详细分析，巴黎天文台和法国国家科学研究中心（CNRS）的研究小组证明，与人们的预期相反，米马斯的海洋深度仅为 20-30 千米。据认为，它形成的时间还不到 2000 万年。这一发现使米马斯成为研究生命最初出现的原始条件的独特目标。https://astrotube.obspm.fr/static/streaming-playlists/hls/350da782-722a-4e89-9044-2a8ff182605f/aeafc091-cdd9-49a0-a92c-f079de149b72-master.m3u8https://astrotube.obspm.fr/videos/embed/7xYpW1yMeuU64maMba84tM3970632024-01-09T09:49:02.013Z天体力学冰海饱和含羞草YESIMCCENOhttps://astrotube.obspm.fr/w/rDjYRkQCuCkLaKzxXxnmENhttps://astrotube.obspm.fr/lazy-static/thumbnails/82a8d1da-4686-42aa-a83a-3cc2308dfdc5.jpgWebinar ASNUM 05/02/24: Machine learning for plasma physics: theory, simulation and experimentPaulo Alves UCLA At the core of some of the most important problems in plasma physics—from controlled nuclear fusion to the acceleration of cosmic rays—is the challenge to describe nonlinear, multiscale plasma dynamics. The development of reduced plasma models that balance between physical accuracy and computational complexity is critical to advancing theoretical comprehension and enabling holistic computational descriptions of these problems. In this talk, I will discuss the possibility of using data-driven techniques to develop accurate reduced plasma models (in the form of partial differential equations) directly from the data of first-principles particle-in-cell simulations. In particular, I will discuss 1) how data-driven model-discovery techniques based on sparse optimization can be used infer interpretable reduced plasma models, 2) an effective strategy for robust model identification in the presence of the high data noise that is intrinsic to first-principles particle-based simulations, and 3) strategies for embedding fundamental physics symmetries in the model-discovery methodology. I will demonstrate the potential of this approach by recovering the fundamental hierarchy of plasma physics models—from the Vlasov equation to single-fluid magnetohydrodynamics. I will end with an outlook on how this data-driven methodology offers a promising route to accelerate the development of reduced theoretical models of complex nonlinear plasma phenomena and to design computationally efficient algorithms for multiscale plasma simulations.https://astrotube.obspm.fr/static/streaming-playlists/hls/cfaaaed5-6fa1-40b3-99d8-8ac759c8e872/5454a599-3413-434c-9983-6fa2ba873ce7-master.m3u8https://astrotube.obspm.fr/videos/embed/rDjYRkQCuCkLaKzxXxnmEN31145222024-02-07T18:50:44.433ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/8UMzH12zpzqzrcKXJKQr16https://astrotube.obspm.fr/lazy-static/thumbnails/80217f20-125b-4b03-b797-21f31782f132.jpgInspiral-Merger-Ringdown waveform modeling to estimate spins of astrophysical black holes, Speake...The LIGO-Virgo-KAGRA (LVK) collaboration has published about 90 gravitational wave observation since the first detection in 2015, majority of which have been from binary black holes. With such a statistically significant number of events it is possible to infer astrophysical distribution of black hole masses and spins. Of particular interest are spins(mis-aligned with the orbital angular momentum) of the component black holes in a binary, as they can shed light on the binary formation mechanism. Spin-misalignments of the component black holes leave their imprints on the waveform. One such modulation is due to an asymmetry between the +m and -m multipoles of the harmonic decomposition of the gravitational wave signal from the binary. This is not included in most signal models used in LVK analysis to date. I will present the first frequency-domain model of the asymmetry in the dominant co-precessing-frame signal multipole throughout inspiral, merger and ringdown. This model has been incorporated into the latest iteration of PHENOM family of precessing-binary models (PhenomXO4a) that will be used for analysing data from the fourth observing run (O4) of the LVK. I will briefly describe the features captured in PhenomXO4a and the prospect of spin measurements using this model.https://astrotube.obspm.fr/static/streaming-playlists/hls/400ebcae-e7d0-4fe5-9e8f-a01d55fcd239/622f0023-a153-4662-9b38-990fccd693c5-master.m3u8https://astrotube.obspm.fr/videos/embed/8UMzH12zpzqzrcKXJKQr163639092024-02-15T12:25:48.414ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/ccNFnfshgfr9KKXEY36nGHhttps://astrotube.obspm.fr/lazy-static/thumbnails/1f1df96c-0f81-41b2-b9fb-2c867847e4b5.jpgTowards a self-consistent description of astrophysical blast waves in extreme environments, speak...In high-energy and multi-messenger astrophysics, much of the phenomenology relates to the dissipation of an energy reservoir into accelerated particles that then radiate in various channels (cosmic rays, electromagnetic signals, from radio to gamma rays, and neutrinos), and most of the effort focuses on pinpointing the reservoir and the dissipation process at play Bursts of these high-energy particles often result from efficient kinetic or Poynting flux conversion in nonthermal distributions through collective plasma processes associated with astrophysical shock waves. In this talk, I will outline recent numerical and theoretical efforts to model the transport of particles and acceleration in multiple classes of shock waves relevant to various environments, such as gamma-ray bursts and supernova remnants. In the first part of the talk, we will focus on collisionless shock waves propagating in weakly magnetized environments. Their dynamics are led by forming kinetic-scale magnetic structures coherent over hundreds of kilometers. We will discuss the nonlinear modeling of ambient plasma heating, acceleration, and radiation through the self-consistent interaction with these structures. I will then review the plasma effects in a second class of astrophysical shocks called Radiation-Mediated Shocks (RMS). More specifically, We will discuss the physics of RMS in the relativistic regime, shaping the prompt gamma-ray burst emission. In this regime, the shock wave is mediated by Compton scattering and copious electron-positron pair creation, in which plasma effects can be significant.https://astrotube.obspm.fr/static/streaming-playlists/hls/5aba7938-94da-47a9-979f-0701b9313515/d3b94888-bf01-4373-b63e-7a38f2eb6efe-master.m3u8https://astrotube.obspm.fr/videos/embed/ccNFnfshgfr9KKXEY36nGH3374072024-02-15T12:53:40.108ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/hhAktLriqnVtHj7vCm85Qyhttps://astrotube.obspm.fr/lazy-static/thumbnails/2ea80354-954c-4755-816c-f0c1dfa89b4f.jpgwebinar ASNUM 18/12/23: New prospects on Wide-Field imaging with Deep LearningEmmanuel Bertin (CEA) Since the 19th century, wide-field imaging has significantly advanced numerous fields of Astrophysics, spanning from the study of solar system bodies to observational cosmology. Further advances in detector technology and processing power now enable the exploration of the time domain at increasingly high frame rates. Through concrete examples, I will show with how Deep Learning and GPU processing offer promising solutions to address contemporary challenges in wide-field imaging and time-domain astronomyhttps://astrotube.obspm.fr/static/streaming-playlists/hls/83e34772-a5bd-430a-b680-62fb9466faa8/0e7c0d72-5b71-4e84-96e1-8c1dcd2fa3f8-master.m3u8https://astrotube.obspm.fr/videos/embed/hhAktLriqnVtHj7vCm85Qy26235252024-03-13T12:08:44.241ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/5zUQJtnegayqoyd7hYf9mDhttps://astrotube.obspm.fr/lazy-static/thumbnails/c63cf28b-04bf-4df6-b15b-bc92d8fadccc.jpgWebinar ASNUM 18/03/24: The environmental costs of computingAnne-Laure Ligozat Laboratoire Interdisciplinaire des Sciences du Numérique (LISN) The use of digital services and equipment keeps increasing in all domains, and in particular in scientific computing. These digital applications have environmental costs, that have begun to be taken into account. But assessing the environmental impact of digital technology poses a number of difficulties, requiring the adaptation of methodologies and access to data that is not always available. In this talk, I will present what is currently known about the impact of digital technology, and scientific computing in particular.https://astrotube.obspm.fr/static/streaming-playlists/hls/2520a9b9-8a49-4109-a849-1ebf0507e0fd/4a39a290-694a-49dc-80d1-46e4b8deb5a4-master.m3u8https://astrotube.obspm.fr/videos/embed/5zUQJtnegayqoyd7hYf9mD28350292024-03-18T22:34:03.276ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/vvPTCGyugHpMs6uxS9AvVbhttps://astrotube.obspm.fr/lazy-static/thumbnails/c158cac1-644d-4c55-ad33-e72538542c7c.jpgEcotrail de Paris 2024La majorité des courses passaient par le site de Meudon de l'Observatoire de Paris - PSL. Les départs des trails 30km et 18km, et de la marche nordique de 18km se faisaient depuis la Terrasse de l'Observatoire. copyright Observatoire de Paris - PSLhttps://astrotube.obspm.fr/static/streaming-playlists/hls/ef031a96-fa75-4295-b9f1-ce1bd838d0f0/8b462a7b-8228-47cc-ae7b-ea8b55629d26-master.m3u8https://astrotube.obspm.fr/videos/embed/vvPTCGyugHpMs6uxS9AvVb600182024-03-26T14:56:29.517ZYESMain atrentinella channelNOhttps://astrotube.obspm.fr/w/r66RPCGrNYsRgjL5PPeQmAhttps://astrotube.obspm.fr/lazy-static/thumbnails/ecaa4279-1014-4597-a827-5566fe9319ca.jpgLie algebras in SageMath, speaker: Travis Scrimshaw (Université d'Hokkaido, Japon)Lie algebras are an important class of algebras with deep applications to physics. We will give a brief overview of the mathematical definition. After this, we will discuss the current implementation in SageMath, including finite dimensional, affine, nilpotent, and other special classes. We will conclude with a discussion of the future implementations.https://astrotube.obspm.fr/static/streaming-playlists/hls/cb2acbcb-d2ac-47e1-baf3-edef635d20c2/6d804ed3-7412-4dd0-bfc3-636d274d5046-master.m3u8https://astrotube.obspm.fr/videos/embed/r66RPCGrNYsRgjL5PPeQmA4497082024-03-27T12:59:40.163ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/ebjVnu2PCRBmW479HdirpThttps://astrotube.obspm.fr/lazy-static/thumbnails/21dce126-0d42-4cea-8644-c0da07b10634.jpgOn the integrability of extended body dynamics around black holes; Paul RAMOND (IMCCE)In general relativity, freely-falling objects follow geodesics of the background spacetime in which they live. In a sense, this feature is a mere rephrasing of Einstein’s equivalence principle. In 1968, Brandon Carter showed that the geodesic motion of objects orbiting a Kerr black hole was integrable, in the sense of Hamiltonian mechanics, by discovering a fourth constant of motion that now bears his name. This “universality” of geodesic free fall, however, is but an approximation: In general, two different bodies will follow two distinct paths, depending on how they spin and deform. In this talk, I will show how, and to which extent, Carter’s integrability of Kerr geodesics can be extended to the motion of not just mere point masses, but also extended bodies that can spin and deform. https://astrotube.obspm.fr/static/streaming-playlists/hls/6ab7e677-16ef-40ae-b50a-af34cb3485f5/1ba208d9-57fc-495c-b0a5-2dce10b30c07-master.m3u8https://astrotube.obspm.fr/videos/embed/ebjVnu2PCRBmW479HdirpT5034062024-03-27T13:36:20.628ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/7fiKWF45p3fmzQsK8gkFnChttps://astrotube.obspm.fr/lazy-static/thumbnails/b32e9b38-0a78-4868-bba1-521492cd6e9e.jpgWebinar ASNUM 8/04/24: Automatically discovering analytical physical laws using deep reinforcemen... Wassim Tenachi, Observatoire astronomique de Strasbourg (ObaS) Symbolic Regression is the study of algorithms that automate the search for analytic expressions that fit data. Using such approaches one can derive interpretable, intelligible, compact and inexpensive analytical models that tend to present excellent generalization capabilities – such models have the potential to complement neural networks in areas where these attributes are important. With new advances in deep learning there has been much renewed interest in such approaches, yet efforts have not been focused on physics, where we have important additional constraints. I will present Φ-SO, a Physical Symbolic Optimization framework for recovering analytical symbolic expressions from physical data using deep reinforcement learning techniques and its two most innovative features: (1) Our system is built, from the ground up, to propose solutions where the physical units are consistent by construction. This is useful not only in eliminating physically impossible solutions, but because it restricts enormously the freedom of the equation generator, thus vastly improving performances. (2) I will present the ‘Class Symbolic Regression’ extension of our system. This is a first framework for automatically finding a single analytical functional form that accurately fits multiple datasets – each governed by its own (possibly) unique set of fitting parameters. This hierarchical framework leverages the common constraint that all the members of a single class of physical phenomena follow a common governing law. Papers: https://arxiv.org/abs/2303.03192 (SR with RL & dimensional analysis) https://arxiv.org/abs/2312.01816 (Class SR) Code and demo: https://github.com/WassimTenachi/PhySOhttps://astrotube.obspm.fr/static/streaming-playlists/hls/32963032-6b94-4211-b9e8-90898136d96a/377dcdbf-e400-4b2b-8a7f-dc7ab9d61739-master.m3u8https://astrotube.obspm.fr/videos/embed/7fiKWF45p3fmzQsK8gkFnC26760152024-04-08T14:29:04.379ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/s3DjqxoqVsURdKfEBCm1pVhttps://astrotube.obspm.fr/lazy-static/thumbnails/3c09f296-f74b-4775-a5e8-d79109e15e40.jpgThe conundrum of tidal Love number, Sumanta ChakrabortyTidal Love numbers provide us a handle to test the nature of compact objects, as well as theories of gravity. There have been several clarifications recently, which makes our understanding of these Love numbers better. But further investigations have led to more confusion. I plan to discuss these recent developments and the confusing nature of recent literature on these issues. I will show that the tidal Love numbers of a non-rotating black hole identically vanishes, but for a slowly rotating black hole there are other possibilities. The issues with the standard development become more apparent for arbitrary rotating black holes. Besides black holes, I will also highlight some remarkable novel features, for ultra-compact objects with non-trivial reflectivity.https://astrotube.obspm.fr/static/streaming-playlists/hls/d2ec172b-d44b-46d6-810b-0dc53b86432b/857ac3c7-8057-4dd8-b0d4-bc66013c0a7d-master.m3u8https://astrotube.obspm.fr/videos/embed/s3DjqxoqVsURdKfEBCm1pV44970132024-05-06T14:36:36.678ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/oyjcyCABmSRzNd3yuDHAHyhttps://astrotube.obspm.fr/lazy-static/thumbnails/e3ae79de-f017-487e-87cd-8cfb35d1564e.jpgAurores boréales à Meudon - #1Aurores boréales à Meudon dans la nuit du 10 au 11 mai 2024https://astrotube.obspm.fr/static/streaming-playlists/hls/b6ac1121-12ea-4745-adee-e5ddd4027a6a/aa03d6ba-1f64-4f3c-a16f-e95b548e9d92-master.m3u8https://astrotube.obspm.fr/videos/embed/oyjcyCABmSRzNd3yuDHAHy2502024-05-12T13:40:20.372Znorthern lightsaurores borealesYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/4CUz8mL884KEBVjz3HSAuuhttps://astrotube.obspm.fr/lazy-static/thumbnails/ea61601a-958c-48fa-9717-11d518f7d79a.jpgAurores boréales à Meudon - #2Aurores boréales à Meudon dans la nuit du 10 au 11 mai 2024https://astrotube.obspm.fr/static/streaming-playlists/hls/1d7296fe-b46e-4657-b9d3-894f108a121c/4c15589c-04ab-409d-b791-f59680cfdb65-master.m3u8https://astrotube.obspm.fr/videos/embed/4CUz8mL884KEBVjz3HSAuu2002024-05-12T13:41:58.652Znorthern lightsaurores boréalesYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/ikaDaAPQeZvw4hvT9G7F9Dhttps://astrotube.obspm.fr/lazy-static/thumbnails/1b85346d-ab3e-401e-a6a6-103e999e98f6.jpgAurores boréales à Meudon - #3Aurores boréales à Meudon dans la nuit du 10 au 11 mai 2024https://astrotube.obspm.fr/static/streaming-playlists/hls/8c586e21-3bec-41aa-9abe-64f69faaf421/d1973cb8-cf9a-4c72-8af5-9c978cffa95e-master.m3u8https://astrotube.obspm.fr/videos/embed/ikaDaAPQeZvw4hvT9G7F9D2002024-05-12T13:43:16.575Zaurores boréalesnorthern lightsYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/hakuPj77vuPUNNBbCY6xiJhttps://astrotube.obspm.fr/lazy-static/thumbnails/2b5c91db-e6ae-49bb-b8b7-b44514d3743b.jpgAurores boréales à Meudon - #4Aurores boréales à Meudon dans la nuit du 10 au 11 mai 2024https://astrotube.obspm.fr/static/streaming-playlists/hls/82dfed86-84b4-473d-816f-5dcc92b49428/3e5c76cd-5e78-4662-a639-3e27136f98fc-master.m3u8https://astrotube.obspm.fr/videos/embed/hakuPj77vuPUNNBbCY6xiJ2502024-05-12T13:44:56.877Znorthern lightsaurores boréalesYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/nAQFEWjmerNLceuakgNLLrhttps://astrotube.obspm.fr/lazy-static/thumbnails/a836dd0e-bbf0-46c4-a847-6d645aab2873.jpgWebinar ASNUM 27/05/24 : Computing for research in astroparticle physics and cosmology at CC-IN2P3Gabriele Mainetti, Quentin Le Boulc’h, Nadia Lajili, Rachid Lemrani Alaoui, Fabio Hernandez (CC-IN2P3) IN2P3 computing centre (CC-IN2P3) provides computing and data storage services to support the projects of IN2P3’s scientific programme, including those addressing subjects in astroparticle physics and cosmology. We will present services the site offers illustrated by examples of a few projects currently taking data or in their final stages of preparation for entering their operations phasehttps://astrotube.obspm.fr/static/streaming-playlists/hls/aeed33de-7b22-4548-ab81-f0bf576ad781/0921790c-f7ed-4c9b-bbd1-4bbc9944c56c-master.m3u8https://astrotube.obspm.fr/videos/embed/nAQFEWjmerNLceuakgNLLr24185202024-05-27T16:16:47.336ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/uS7UM1J3b8MSS4m6LW3xnphttps://astrotube.obspm.fr/lazy-static/thumbnails/6e44165e-5596-4d9f-bdc0-292721cb2fd8.jpgSpaceBus France 2024SpaceBus France 2024https://astrotube.obspm.fr/static/streaming-playlists/hls/e9bf5452-09fd-419e-a118-8e67b81a51a5/e391d272-0f02-468f-8544-3b1df7392869-master.m3u8https://astrotube.obspm.fr/videos/embed/uS7UM1J3b8MSS4m6LW3xnp11082024-06-05T06:35:30.191ZYESMain atrentinella channelNOhttps://astrotube.obspm.fr/w/hMXaKUWx8JmpxafwFEENrHhttps://astrotube.obspm.fr/lazy-static/thumbnails/fd348120-437e-4336-b848-809124313fe6.jpgMission Santé Spatiale : Webinaire Sport SantéMission Santé Spatiale : Webinaire Sport Santéhttps://astrotube.obspm.fr/static/streaming-playlists/hls/87fcafd4-8fac-4daa-9ace-4ccec440397b/c6ea2673-7478-4bda-b0ea-7de36d6cc97a-master.m3u8https://astrotube.obspm.fr/videos/embed/hMXaKUWx8JmpxafwFEENrH59030112024-06-05T17:34:11.489ZYESMission Santé SpatialeNOhttps://astrotube.obspm.fr/w/w2BDpDR4wCEksctZHsZ4EWhttps://astrotube.obspm.fr/lazy-static/thumbnails/718f9b94-bdc3-4662-bb42-264b1a0e1654.jpgRéveilRéveilhttps://astrotube.obspm.fr/static/streaming-playlists/hls/f32bdedc-e4d9-46a3-81a9-1883b1393826/8b68ba27-9b8e-475a-91b1-04264878655e-master.m3u8https://astrotube.obspm.fr/videos/embed/w2BDpDR4wCEksctZHsZ4EW1662092024-06-06T08:48:47.201ZYESMission Santé SpatialeNOhttps://astrotube.obspm.fr/w/iUzYs1MNwBCe3p1iQZRWashttps://astrotube.obspm.fr/lazy-static/thumbnails/ae3da725-1500-4dd0-9e55-7001e52e04cc.jpgWebinaire ASOV France 10 juin 2024 : F. Bonnarel Un point de vue sur quelques questions posées au VOFrançois Bonnarel (CDS) Un point de vue sur quelques questions posées au VO. Dernière intervention de François Bonnarel dans le cadre d'OV Francehttps://astrotube.obspm.fr/static/streaming-playlists/hls/9102f853-2c74-47be-87d4-ea7337fc1934/0f58eaee-f3d5-45db-a5a6-89ffb55d3c4a-master.m3u8https://astrotube.obspm.fr/videos/embed/iUzYs1MNwBCe3p1iQZRWas36550192024-06-10T18:03:38.855ZYESWebinaires ASOV FranceNOhttps://astrotube.obspm.fr/w/1idbpWMGfTHMzy6TvC9qj5https://astrotube.obspm.fr/lazy-static/thumbnails/98e1b3f4-be14-44c4-b28c-5dca2887216e.jpgLes mouvements libérateursLes mouvements libérateurshttps://astrotube.obspm.fr/static/streaming-playlists/hls/02672665-f284-424c-86bf-696ff0cdf358/1708a0a0-e664-4bbc-9277-b38871ebc1c0-master.m3u8https://astrotube.obspm.fr/videos/embed/1idbpWMGfTHMzy6TvC9qj516300172024-06-14T07:50:36.679ZYESMain atrentinella channelNOhttps://astrotube.obspm.fr/w/2uLNWjfo2NfMzcyzQDhFCuhttps://astrotube.obspm.fr/lazy-static/thumbnails/e21f9b6c-9157-4bca-93e4-0773df8b07c8.jpgLancement de la mission SVOM© Jesse Palmeriohttps://astrotube.obspm.fr/static/streaming-playlists/hls/0c1d9432-db98-421b-aa3a-c243c3d6a3d0/2307eec9-7dae-4267-bb37-d25e8e657c27-master.m3u8https://astrotube.obspm.fr/videos/embed/2uLNWjfo2NfMzcyzQDhFCu460272024-07-01T07:32:12.137ZYESMain atrentinella channelNOhttps://astrotube.obspm.fr/w/6EEqXP8JD79fXRDFPwkVUxhttps://astrotube.obspm.fr/lazy-static/thumbnails/0a920364-449f-42b7-b05d-e1a9fcf90528.jpgÉmergence de Saturne après son occultation par la Lune le 21/08/2024Observation faite au télescope Carolanne (25cm de diamètre) du campus de Meudon de l'Observatoire de Paris - PSL.https://astrotube.obspm.fr/static/streaming-playlists/hls/2de3a3df-47a7-4a68-b5e0-4325dfa1acd3/00b207cd-b08e-4268-877a-2823cd0201fa-master.m3u8https://astrotube.obspm.fr/videos/embed/6EEqXP8JD79fXRDFPwkVUx2005432024-08-21T15:02:19.282Zsaturne2024occultationluneYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/p7oDrWtvPermcfiYgFhqichttps://astrotube.obspm.fr/lazy-static/thumbnails/dfa0dc81-10e7-4e3f-9bb3-b33f7a4039cc.jpgGMT20240704-120623_Recording_1920x1080On 04/07/2024, the first tutorial of the RAMSES SNO was given by Noé Brucy, teaching the basics of git usage: learn how to clone a repository, review contributions, make new contributions, and deal with conflicts. It was split into the following sections: 1. What is git and what it is used for? 2. The vocabulary of git 3. Accessing a git repository, reviewing code 4. Making new contributions 5. Branches and conflicts 6. Some useful tools Tutorial material can be found at https://github.com/nbrucy/git_tutohttps://astrotube.obspm.fr/static/streaming-playlists/hls/bb269b90-6b3e-4eb8-bdd0-eba748d9c815/973411f1-6761-456d-8fd6-178a2abd8f59-master.m3u8https://astrotube.obspm.fr/videos/embed/p7oDrWtvPermcfiYgFhqic4318062024-08-27T09:04:17.399ZtutorialwebinargitRAMSESSNOYESSNO RAMSESNOhttps://astrotube.obspm.fr/w/wEUrJks9LT4D1LqGoQpecbhttps://astrotube.obspm.fr/lazy-static/thumbnails/242077d4-999e-4ed6-83ee-3a3042301ac7.jpgNouvelle lumière pour la Grande Lunette de MeudonNouvelle lumière pour la Grande Lunette de Meudonhttps://astrotube.obspm.fr/static/streaming-playlists/hls/f860be1a-460c-4849-afd5-88f0b7e3b3b4/ca700f33-298c-46be-ba41-5cdabee01bf1-master.m3u8https://astrotube.obspm.fr/videos/embed/wEUrJks9LT4D1LqGoQpecb485982024-08-29T08:48:38.901ZYESMain atrentinella channelNOhttps://astrotube.obspm.fr/w/4QKZL8TzNDX8aq8JcTmAqxhttps://astrotube.obspm.fr/lazy-static/thumbnails/b2f8a83a-c41e-4ef1-9a31-aaec0c2ffb62.jpgLa Grande Lunette : Épopée de la nouvelle lumièreLa Grande Lunette : Épopée de la nouvelle lumièrehttps://astrotube.obspm.fr/static/streaming-playlists/hls/1f1a3af9-1b88-47f0-82ec-ccec2b094d87/62181e6c-bb4b-4ad1-a7c2-40fbd2c79867-master.m3u8https://astrotube.obspm.fr/videos/embed/4QKZL8TzNDX8aq8JcTmAqx240511912024-08-29T19:36:48.774ZYESMain vlapeyrere channelNOhttps://astrotube.obspm.fr/w/gHEweksuvXe3QvWHX6YWnAhttps://astrotube.obspm.fr/lazy-static/thumbnails/e5af312f-4031-4b52-ac4e-4d61e55a0586.jpgComité gestion restauration juillet 2024Comité gestion restauration juillet 2024https://astrotube.obspm.fr/static/streaming-playlists/hls/7f4a5062-b65b-4266-9140-1b110f397e2c/468285c5-eb4f-4ced-a925-7ae4091a6c7c-master.m3u8https://astrotube.obspm.fr/videos/embed/gHEweksuvXe3QvWHX6YWnA1000562024-08-30T07:27:32.296ZYESMain atrentinella channelNOhttps://astrotube.obspm.fr/w/p4NUDoKUQSWxBd9g7LuR2jhttps://astrotube.obspm.fr/lazy-static/thumbnails/fdc12b7e-2aba-490f-b6f3-2818e10c7a02.jpgLes mouvements libérateursLes mouvements libérateurshttps://astrotube.obspm.fr/static/streaming-playlists/hls/baca540f-d816-4533-8d0a-d2d0a6b798d0/072d1fd4-a87d-4151-adb3-984757519579-master.m3u8https://astrotube.obspm.fr/videos/embed/p4NUDoKUQSWxBd9g7LuR2j16300142024-09-04T13:44:15.033ZYESMission Santé SpatialeNOhttps://astrotube.obspm.fr/w/bpMvPgP5mTb7ApDcVygBYbhttps://astrotube.obspm.fr/lazy-static/thumbnails/547602ec-42b5-415d-80a5-3e82063f774f.jpgJournées Européennes du Patrimoine 2024Journées Européennes du Patrimoine 2024https://astrotube.obspm.fr/static/streaming-playlists/hls/544d8ad6-e1d9-4bfd-b728-d4dfd1acc95e/b9462f15-a3bd-4cfd-af70-8a706de79fef-master.m3u8https://astrotube.obspm.fr/videos/embed/bpMvPgP5mTb7ApDcVygBYb840392024-09-27T12:10:04.385ZYESMain atrentinella channelNOhttps://astrotube.obspm.fr/w/hQBox29Nq5r3HRPVuHx6mRhttps://astrotube.obspm.fr/lazy-static/thumbnails/f966a685-d942-44ba-acfe-ee6ed000a646.jpgWebinaire n°2Webinaire n°2https://astrotube.obspm.fr/static/streaming-playlists/hls/885bba7d-7bb5-4d0b-bf29-6e2cea37aa15/10bbb6d3-4d3f-4843-b081-4a8e70e97ffb-master.m3u8https://astrotube.obspm.fr/videos/embed/hQBox29Nq5r3HRPVuHx6mR62460142024-09-30T09:09:54.410ZYESMission Santé SpatialeNOhttps://astrotube.obspm.fr/w/ez8D37JGh14GGT6pRvwSTmhttps://astrotube.obspm.fr/lazy-static/thumbnails/da32d00e-5e15-4772-a031-4c5849f1ec55.jpgFatigue visuelleFatigue visuellehttps://astrotube.obspm.fr/static/streaming-playlists/hls/6de70dee-742e-4582-afc2-4bd25020cb0a/bce39e51-1693-4f85-b839-638dd6ffd2e3-master.m3u8https://astrotube.obspm.fr/videos/embed/ez8D37JGh14GGT6pRvwSTm10830232024-09-30T09:35:28.701ZYESMission Santé SpatialeNOhttps://astrotube.obspm.fr/w/8p7178BkGcBDnMmpwBxrMWhttps://astrotube.obspm.fr/lazy-static/thumbnails/b6b8a9c2-f565-4e7a-a98a-21dd2bd8bd3b.jpgWebinar ASNUM 30/09/24 : The Evolution and Standardization of C++ for the Future of Numerical Ast...Vincent Reverdy (Laboratoire d’Annecy de Physique des Particules) The Evolution and Standardization of C++ for the Future of Numerical Astrophysics Over the last 15 years, the C++ programming language has evolved significantly, providing more constructs and features to users. But while a part of the numerical astrophysics community is transitioning to the language, it is worth analyzing its evolution and where it is going. In the first part of the presentation, I will discuss current and upcoming features that can be leveraged in the context of high-performance numerical astrophysics. I will present real-case examples of what is already possible, and what can we expect for the near future. The second part of the presentation will be dedicated to the long term future. The adoption of a new language for a community like ours is a big step forward that is likely to have consequences in the decades to come given the lifetime of our codes. Some design choices that are made now, may stay forever. In this context, I will discuss the general evolution of the language in the light of what I have learned from 10 years of participation in the C++ standards committee. Finally, I will conclude by trying to give a bigger picture on the interplay between programming language evolution and computational physics from both the standpoint of computer science and physics, and what it means for the codes we are currently developing.https://astrotube.obspm.fr/static/streaming-playlists/hls/3be9c6ad-7979-4e01-9d8c-57b96a59bc74/8586bc98-4058-49c5-8ce3-3655f9b7589f-master.m3u8https://astrotube.obspm.fr/videos/embed/8p7178BkGcBDnMmpwBxrMW30255382024-09-30T15:33:11.982ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/erkY4XZXobPs9LxNoULTgrhttps://astrotube.obspm.fr/lazy-static/thumbnails/04cae869-60d4-4866-aa07-bc7757c325e9.jpgWebinar ASNUM 13/10/24 : The Galactica databaseDamien Chapon CEA Saclay The Galactica database: an open, generic and versatile tool for the dissemination of numerical simulation data in astrophysics. The Galactica simulation database is a platform designed to assist computational astrophysicists with their open science approach based on FAIR principles. It offers the means to publish their numerical simulation projects, whatever their field of application or research theme and provides access to reduced datasets and object catalogs online. The application implements the Simulation Datamodel IVOA standard. To give the scientific community the possibility to also access raw simulation data, Galactica integrates WebServices able to generate, on an “on-demand” basis, high-level data products that can be customized to meet specific user requirements. To that end, the Galactica central web application communicates with a high-scalability ecosystem of data-processing servers called ‘Terminus’ by means of an industry-proven asynchronous task management system. Each Terminus node, hosted in a research institute, a regional or national supercomputing facility, contributes to the ecosystem by providing both the storage and the computational resources required to store the massive simulation datasets and post-process them to create the data products requested on Galactica, hence guaranteeing fine-grained sovereignty over data and resources. This distributed architecture is very versatile, it can be interfaced with any kind of data-processing software, written in any language, handling raw data produced by every type of simulation code used in the field of computational astrophysics. Its genericity and versatility, together with its excellent scalability makes it a powerful tool for the scientific community to disseminate numerical models in astrophysics at the exascale era. To help computational astrophysicists publish their simulation projects online, a user-fiendly python API called ‘astrophysix’ has also been im...https://astrotube.obspm.fr/static/streaming-playlists/hls/6cd0b3a5-7636-40ad-8a28-aa28894b048b/ed6289ea-4c93-4720-87b0-d9e0fe2436a4-master.m3u8https://astrotube.obspm.fr/videos/embed/erkY4XZXobPs9LxNoULTgr27920202024-10-15T17:52:20.165ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/jJ3RUXpigRYjwUVQ8BNfbHhttps://astrotube.obspm.fr/lazy-static/thumbnails/c62d2a71-eccc-41a2-9c5f-5a150affc022.jpgÉNÉRALISATION INHOMOGÈNE DU MODÈLE COSMOLOGIQUE STANDARD : LA SOLUTION EXACTE DE LA RG DITE SZEKERESLa solution homogène et isotrope des équations d’Einstein dite LambdaCDM, assortie de ses perturbations linéaires et d’ordres supérieurs, forme le socle de la cosmologie contemporaine permettant de comprendre, dans ses grandes lignes, l’évolution et la géométrie de notre Univers. Les réflexions suivantes nous incitent à aller plus loin. Tout d’abord, l’homogénéité et l’isotropie de l’Univers ne sont que des propriétés moyennes valables à des échelles qui reculent au fur et à mesure de la découverte de structures à des décalages vers le rouge de plus en plus grands. L’avènement d’une cosmologie de précision conduit ainsi à l’émergence ou à l’amplification de tensions, voire d’anomalies, dues au décalage entre prédictions extrapolées depuis l’Univers lointain et observations à précision accrue de l’Univers proche. La Relativité Générale nous offre une manière de résoudre ces incompatibilités. Le modèle Szekeres est une solution exacte des équations d’Einstein, inhomogène et sans symétrie, capable de représenter la région de notre Univers dominée par la matière et/ou la constante cosmologique, puisque sa source gravitationnelle est un fluide de pression nulle et que la constante cosmologique peut y être incorporée. Son atout majeur est d’inclure la solution homogène et isotrope de Friedmann comme cas limite. Elle est donc susceptible de reproduire naturellemnt la transition homogène/inhomogène à l’échelle où les fonctions qui la décrivent deviennent analogues aux paramètres cosmologiques standards. Les prédictions les plus robustes de la cosmologie de l’Univers lointain restent ainsi conservées. Au cours de ce séminaire, la solution Szekeres sera présentée avec ses principales propriétés nécessaires à une utilisation dans un contexte cosmologique. Les différentes expériences qui devront être utilisées pour contraindre les fonctions-paramètres qui déterminent le modèle Szekeres d’Univers valable à précision donnée seront décrites et commentées. Les perspectives ouver...https://astrotube.obspm.fr/static/streaming-playlists/hls/97a37f42-7cfc-4074-8bf5-32e37ad0bea5/db386da6-ade1-44c5-b630-ea60e895ec9f-master.m3u8https://astrotube.obspm.fr/videos/embed/jJ3RUXpigRYjwUVQ8BNfbH38610122024-10-17T13:03:54.500ZYESLUTh seminarsNOhttps://astrotube.obspm.fr/w/rwcPzMkEEMdqcQdsjjuezShttps://astrotube.obspm.fr/lazy-static/thumbnails/bfead721-08aa-42c3-94c1-0f2f8b8fd0de.jpgTimelapse 24/10/2024Vue du campus de Meudon de l'Observatoire de Paris - PSL dans la nuit du 23 au 24 octobre 2024. La comète C/2023 A3 (Tsuchinshan-ATLAS) est visible dans le ciel.https://astrotube.obspm.fr/static/streaming-playlists/hls/ceac106d-93ac-4cd1-ab3c-c89397d61dc0/9e668535-432a-4665-8d1a-adf5c984665f-master.m3u8https://astrotube.obspm.fr/videos/embed/rwcPzMkEEMdqcQdsjjuezS50312024-10-24T21:45:21.363ZtimelapseTsuchinshan-ATLAScometemeudonc/2023 a3YESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/h3pimJdHU9fDRVjPnZfKwthttps://astrotube.obspm.fr/lazy-static/thumbnails/abce7f3a-8b1a-4014-90b3-c391f4145b23.jpgOccultation de l'étoile TYC-5798-634-1 par l'astéroïde (5044) ShestakaOccultation de l'étoile TYC-5798-634-1 par l'astéroïde (5044) Shestaka observée à Meudon le 23/10/2024 dans le cadre du projet GaiaMoons.https://astrotube.obspm.fr/static/streaming-playlists/hls/81e81095-8ff9-4758-8c91-46e28c51ae93/7a227548-aed6-454a-92a4-d3a55d19e3ae-master.m3u8https://astrotube.obspm.fr/videos/embed/h3pimJdHU9fDRVjPnZfKwt100172024-10-24T21:47:19.072Z(5044) ShestakaoccultationmeudonYESChaîne de Miguel MontargèsNOhttps://astrotube.obspm.fr/w/6fyn1G19uaFEyRZc7S7LeAhttps://astrotube.obspm.fr/lazy-static/thumbnails/f67e8443-f2d6-4c14-87ff-f08c3b2221cd.jpgFête de la Science 2024Fête de la Science 2024https://astrotube.obspm.fr/static/streaming-playlists/hls/2a860ccf-6a66-4899-8a9a-3b9be31f5d54/d82e8546-78f1-41eb-a118-f887c08e13ea-master.m3u8https://astrotube.obspm.fr/videos/embed/6fyn1G19uaFEyRZc7S7LeA750362024-11-04T14:31:30.682ZYESMain atrentinella channelNOhttps://astrotube.obspm.fr/w/urS93WVtrEToRNGFWeGMj8https://astrotube.obspm.fr/lazy-static/thumbnails/9a4fb32f-1be8-4c96-99c6-c4414095d93a.jpgObscast N°1 - PSSIObscast N°1 - PSSIhttps://astrotube.obspm.fr/static/streaming-playlists/hls/e65c6038-d8ae-4189-b420-c216882f92ff/6473ba6a-8824-446c-971b-aa071f462eb3-master.m3u8https://astrotube.obspm.fr/videos/embed/urS93WVtrEToRNGFWeGMj828680362024-11-06T10:35:26.600ZYESObscastNOhttps://astrotube.obspm.fr/w/2S6koiJ8Zr2SRhdNn5uQWbhttps://astrotube.obspm.fr/lazy-static/thumbnails/890ac9e9-a5fc-4869-a453-5082b48fab0f.jpgWebinar ASNUM 25/11/24 : Building new brains for giant astronomical telescopes with Deep Neural ...Damien Gratadour Observatoire de Paris The field of experimental astronomy is entering an exciting new era, with the emergence of extremely large telescopes, hosts to primary mirrors the size of several basketball courts. Among the many challenges associated with the construction and operations of such giant scientific infrastructures, the complexity of embedded computing facilities is notably heavy. In particular, the real-time control of adaptive optics (AO) systems, the core components of giant telescopes used to compensate the strong blur induced by stochastic fluctuations of the atmospheric turbulence, is becoming a key challenge. These multi-million euros engineering marvels, require extreme computing facilities to control the thousands of actuators they host, adjusting the wavefront locally with a stroke of a few microns, from the thousands of measurements produced every thousandth of a second by high speed and low noise sensors. To make these unique facilities operational, billions of numbers have to be crunched at high accuracy and in real-time. Our team at Observatoire de Paris has developed novel approaches based on deep connectionist architectures able to augment the classical control workflows used in these facilities. I will review the various methods we currently use to denoise sensors data, implement non-linear wavefront reconstruction and realize predictive control based on both supervised and reinforcement learning. I will also review the several ways to build trust in such extreme data processing context and discuss future challenges as we design systems able to observe rocky exoplanets around other stars.https://astrotube.obspm.fr/static/streaming-playlists/hls/0f179d4f-14ec-488d-8324-3c7835006146/cd4d25fa-f6c1-46e6-a94d-3570dd824cb0-master.m3u8https://astrotube.obspm.fr/videos/embed/2S6koiJ8Zr2SRhdNn5uQWb24790362024-11-25T17:56:24.626ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/r6FTTXAjWWf47cJE8e5q1shttps://astrotube.obspm.fr/lazy-static/thumbnails/c5dec22d-dfd6-4e13-a199-080082cfb117.jpgColloque de Femmes & Sciences du 22 novembre.Vidéo réalisée par la CASDEN lors du colloque de Femmes & Sciences du 22 novembre.https://astrotube.obspm.fr/static/streaming-playlists/hls/cb3fc578-471b-4c88-a03e-6304c3088eca/1ba08048-ab35-4e4f-8646-4b473a3aa5ec-master.m3u8https://astrotube.obspm.fr/videos/embed/r6FTTXAjWWf47cJE8e5q1s2300172024-11-29T16:41:47.772ZYESMain atrentinella channelNOhttps://astrotube.obspm.fr/w/feyCnH8dgZDpdLPJo5bsHrhttps://astrotube.obspm.fr/lazy-static/thumbnails/e7411f4a-4a0a-45ae-ba2f-575aa043f2e3.jpgObscast N°2 : Diffusion de la culture scientifique sur les réseaux sociauxObscast N°2 : Diffusion de la culture scientifique sur les réseaux sociauxhttps://astrotube.obspm.fr/static/streaming-playlists/hls/7344b7aa-38f9-4db8-bc1d-a95c294a609b/7fcb1695-e35b-4a85-ae7b-ba5ede9c891f-master.m3u8https://astrotube.obspm.fr/videos/embed/feyCnH8dgZDpdLPJo5bsHr48930222024-11-29T17:05:50.796ZYESObscastNOhttps://astrotube.obspm.fr/w/hK44dwS5M5qcJPRZSxXHiehttps://astrotube.obspm.fr/lazy-static/thumbnails/9737a296-d2c3-4820-8a01-5ae4c3cf2c62.jpgWebinar ASNUM 9/12/24 : Planet-disk interactions with the fargOCA codeAlain Miniussi et Elena Lega Observatoire de la Côte d'Azur Planet-disk interactions with the fargOCA code: transitioning from CPUs to Hybrid Architectures with Kokkos The original version of the FARGO code (Fast Advection in Rotating Gaseous Objects) was written in C in 2000 by F. Masset. It simulated a 2D gas disk interacting gravitationally with its host star and embedded planets. In 2013, the code was extended to simulate a 3D disk at the OCA, incorporating radiative and internal energy treatment. This extension gave rise to the name fargOCA (FARGO with Colatitude Added at OCA). Parallelization was implemented using MPI and OpenMP. Between 2013 and 2018, researchers and postdocs added various features, such as a non-uniform grid for zooming in on planetary dynamics and stellar irradiation routines. Version control was managed with SVN. In 2018, the code underwent refactoring to improve structure and usability. It was rewritten in C++, introducing object-oriented classes, integration tests, and transitioning to GitLab for version control. The refactor aimed to ensure the code remained functional while accommodating a growing and evolving user community, including PhD students, postdocs and students from the local Astrophysics master’s program. To enhance performance, GPU acceleration was integrated in 2021. Kokkos was adopted to ensure portability and allow transition without interrupting code exploitation, offering a unified programming model for CPUs and GPUs. The code now runs efficiently on local clusters and national supercomputing centers. In this webinar, we will review the evolution of the code, highlighting performance improvements and its impact on research projects. Link to the tutorials : https://gitlab.oca.eu/DISC/presentations/fargoca/asnum-20241209-kokkos https://astrotube.obspm.fr/static/streaming-playlists/hls/8795156a-939b-4c7a-8aed-e84e404b3133/fa023462-c212-4f5c-9781-47a5fec0993c-master.m3u8https://astrotube.obspm.fr/videos/embed/hK44dwS5M5qcJPRZSxXHie32460352024-12-09T16:50:57.195ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/fDBZ1YRYMtMNujehTHgZnvhttps://astrotube.obspm.fr/lazy-static/thumbnails/8d4fc38b-ba38-43ed-9d55-8b220dc0e019.jpgObsCast DécembreObsCast Décembrehttps://astrotube.obspm.fr/static/streaming-playlists/hls/76a0a2d5-a30f-40b5-9e57-6bfd1264872b/f3eefeab-78ce-4c66-a1b7-91958ad1a9d6-master.m3u8https://astrotube.obspm.fr/videos/embed/fDBZ1YRYMtMNujehTHgZnv26890402024-12-11T09:37:23.929ZYESObscastNOhttps://astrotube.obspm.fr/w/ghfso7nuXn6sorFXUfWHTphttps://astrotube.obspm.fr/lazy-static/thumbnails/96599c88-0192-40d7-bb94-87ef5e42a014.jpgCarte de voeux 2025Carte de voeux 2025https://astrotube.obspm.fr/static/streaming-playlists/hls/7bbde36a-07b2-4faf-a55f-ce8b5d114c79/a6716f13-e82f-4a5e-ba88-e2839907e5ed-master.m3u8https://astrotube.obspm.fr/videos/embed/ghfso7nuXn6sorFXUfWHTp3903622025-01-07T09:34:38.597ZYESObscastNOhttps://astrotube.obspm.fr/w/einFvE3DDSXUpmaGG9867Xhttps://astrotube.obspm.fr/lazy-static/thumbnails/7017a0f7-2cdc-4362-8792-8627f711f18c.jpgECLAT-webinaire1-SLICESECLAT-webinaire1-SLICEShttps://astrotube.obspm.fr/static/streaming-playlists/hls/6bb3cee6-57fc-411d-b273-92037dc2ce5f/7ac0d8c7-2cdb-45a0-80fb-5d550c358967-master.m3u8https://astrotube.obspm.fr/videos/embed/einFvE3DDSXUpmaGG9867X14070232025-01-09T09:31:23.544ZYESECLATNOhttps://astrotube.obspm.fr/w/999nzWQuuNX2Wm7upynppjhttps://astrotube.obspm.fr/lazy-static/thumbnails/c5a7e9eb-127a-4e5e-a68b-e470314602df.jpgECLAT-webinaire2-SRC-frECLAT-webinaire2-SRC-frhttps://astrotube.obspm.fr/static/streaming-playlists/hls/41ec380e-336f-47c1-9937-f5437930462c/03aa9312-c8f7-42bb-9dfe-1d77313fc4b7-master.m3u8https://astrotube.obspm.fr/videos/embed/999nzWQuuNX2Wm7upynppj22700432025-01-10T14:49:29.694ZYESECLATNOhttps://astrotube.obspm.fr/w/csDA8KVJTmZ8NA8a7Eh7rMhttps://astrotube.obspm.fr/lazy-static/thumbnails/c9178458-6276-443c-adde-6c776bdf43bd.jpgWebinar ASNUM 17/02/25: Domain-informed analysis of (astro)physics dataAdeline Paiement Université de Toulon Machine learning and deep learning methods are increasingly popular for analysing physics and astrophysics data. However, their use often faces some specific challenges, such as the low availability of annotated ground-truth data, or the interpretability of (learning) models and of their prediction results. In this talk, we will review some recent efforts in developing learning methods that address the specific challenges of (astro)physics data. These developments exploit knowledge of the physics problem and data to inform the design of learning models.https://astrotube.obspm.fr/static/streaming-playlists/hls/5ccd072c-94bd-4abc-bf0e-6d0ad521bd0f/5ae4a2f9-09be-4d33-be3f-ee69ed6096bf-master.m3u8https://astrotube.obspm.fr/videos/embed/csDA8KVJTmZ8NA8a7Eh7rM32720392025-02-18T18:38:32.795ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/9KFjALvUDYxrL7XfJGi6R4https://astrotube.obspm.fr/lazy-static/thumbnails/e0781118-06dd-41f9-9288-3a5c0b65a7d1.jpgECLAT-webinaire3-GASKAPECLAT-webinaire3-GASKAPhttps://astrotube.obspm.fr/static/streaming-playlists/hls/46e252d8-c1a8-4530-91b2-70a9a30a3339/93f1db9e-9035-4d56-8240-c4dc26e73852-master.m3u8https://astrotube.obspm.fr/videos/embed/9KFjALvUDYxrL7XfJGi6R440750412025-03-14T15:04:24.514ZYESECLATNOhttps://astrotube.obspm.fr/w/6XqnjvToxf3kAjUMnvoEw3https://astrotube.obspm.fr/lazy-static/thumbnails/abfe60f6-348a-40e6-a078-4dc7f4e9edba.jpgWebinar ASNUM 14/04/25: Enhancing Globular Cluster simulations with deep-learning: a forward mod...Paolo Bianchini Observatoire astronomique de Strasbourg (ObAS) Enhancing Globular Cluster simulations with deep-learning: a forward modelling approach Globular clusters (GCs) are ubiquitous stellar systems found in nearly all galaxies; however, their origin in the primordial universe remains unknown. Despite their apparent simplicity, GCs present several modelling challenges: due to their old ages, the repeated gravitational interactions between ~1 million stars strongly impact their evolution and need to be calculated directly. Therefore, an efficient multi-scale approach to resolve this so-called “million-body problem” is needed. In this talk, I will present my current efforts in modelling realistic GCs, with a particular focus on a forward-modelling approach to interpret current and future observations. I will first introduce a new suite of >20 realistic star-by-star N-body simulations, run with NBODY6+++GPU, incorporating physics from the scale of stars (e.g. stellar evolution) to the one of external host galaxy (external tidal field), and using a realistic number of stars (N = 250k–1.5M). These simulations allow us to carry a first comparison with present-day GC properties and help establish a link with their formation properties in the high-z universe. I will then demonstrate how deep-learning techniques —specifically convolutional neural networks trained on synthetic images— can maximize the scientific return of these computationally expensive simulations for a direct comparison with observations. In particular, I will highlight recent developments in the pi-DOC deep-learning algorithm, designed to measure the dynamical and morphological properties of GCs in both the Milky Way and Andromeda, from space telescope observations. These promising results suggest that detailed dynamical studies of GCs could soon be extended beyond the Local Group, providing new valuable insights into the formation and evolution of these ancient stellar systems.https://astrotube.obspm.fr/static/streaming-playlists/hls/303a9e21-9b80-4edf-9781-afaf49c417c6/6f160ade-b12f-4fe9-8b60-2cd13f13e355-master.m3u8https://astrotube.obspm.fr/videos/embed/6XqnjvToxf3kAjUMnvoEw323270252025-04-14T17:10:52.074ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/wQX15Qcad8P6GsQoAew2fohttps://astrotube.obspm.fr/lazy-static/thumbnails/979bbf89-bfb4-4715-8fd8-2d7919cb784b.jpgfaire craquer les mecsMais non, tu veux dire qu'il y a une manière infaillible de séduire les opticien.ne.s ?https://astrotube.obspm.fr/static/streaming-playlists/hls/f9c7c1b0-7886-4c5a-aa34-d3c210c931a6/dd971e25-88b3-4685-9e31-b4b1ad7f305a-master.m3u8https://astrotube.obspm.fr/videos/embed/wQX15Qcad8P6GsQoAew2fo345682025-04-15T19:20:25.913ZBorn & WolfOptiqueastucesYESMain epechevis channelNOhttps://astrotube.obspm.fr/w/qSAmFQgcgHQxpnKUekquwshttps://astrotube.obspm.fr/lazy-static/thumbnails/b1e841d5-ccee-471c-bec9-135368e294d6.jpgQui est-ce ? Version ObservatoireOh là là, c'est allé beaucoup trop vite !https://astrotube.obspm.fr/static/streaming-playlists/hls/c96bb07b-c9b4-455b-9e55-738035409b66/833c188a-e5fd-49df-8011-391207433a25-master.m3u8https://astrotube.obspm.fr/videos/embed/qSAmFQgcgHQxpnKUekquws360532025-04-23T15:59:13.684ZYESMain epechevis channelNOhttps://astrotube.obspm.fr/w/uYtew39XsQRyPaAxF64Nvnhttps://astrotube.obspm.fr/lazy-static/thumbnails/a65be9e6-b0a4-47b4-ad9c-785fb6a89d39.jpgODISSEE-webinar1ODISSEE-webinar1https://astrotube.obspm.fr/static/streaming-playlists/hls/eaa2510a-f5db-498d-9b08-fa45ad815c07/4a540066-d2d8-44e8-9416-0e14fc6bdbec-master.m3u8https://astrotube.obspm.fr/videos/embed/uYtew39XsQRyPaAxF64Nvn27400242025-05-15T07:18:03.901ZYESODISSEENOhttps://astrotube.obspm.fr/w/jUQfmH1ToPE2ZWzEw19Nrohttps://astrotube.obspm.fr/lazy-static/thumbnails/0a75f0bb-aa5c-4256-b4c4-0919e19ef34e.jpgWebinar ASNUM 19/05/25 : Dissecting the physics and chemistry of UV irradiated molecular gas wit...Emeric Bron (OBSPM) Dissecting the physics and chemistry of UV irradiated molecular gas with the Meudon PDR code. The Meudon PDR code is a state-of-the-art reference code for the study of the physics and chemistry of the interstellar medium, and in particular the impact of radiative feedback from star formation on molecular clouds. This webinar will present the wide range of coupled physical and chemical processes included in this model, the organization and perspectives of the code’s development as an ANO CC, as well as the ISMDB model database and associated analysis tools, distributed within the ANO5 Platform MIS & Jets. This will be illustrated with application examples. https://astrotube.obspm.fr/static/streaming-playlists/hls/9924e7d0-21b9-4029-a952-0db4dbea4838/f65f7ec9-1c1f-4163-b7ba-829137424162-master.m3u8https://astrotube.obspm.fr/videos/embed/jUQfmH1ToPE2ZWzEw19Nro32740112025-05-19T22:22:47.236ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/mzupySnL5p3jEpHQyAkFQthttps://astrotube.obspm.fr/lazy-static/thumbnails/eefae3c1-f57b-4dee-ac5e-2c2104e0fe89.jpgODISSEE-internal-webinar1-EARODISSEE-internal-webinar1-EARhttps://astrotube.obspm.fr/static/streaming-playlists/hls/a6a3d2d9-4819-4cff-9525-56b3f50fa20f/2c5e0972-5e16-4940-9dc3-349a483dc0d1-master.m3u8https://astrotube.obspm.fr/videos/embed/mzupySnL5p3jEpHQyAkFQt3047052025-05-21T06:18:43.959ZYESODISSEENOhttps://astrotube.obspm.fr/w/4QrABZ7xrDtPLX9LaH7gJYhttps://astrotube.obspm.fr/lazy-static/thumbnails/70ddbb5d-1722-4f65-a1e0-e946bb44692c.jpgECLAT-webinaire4-IOECLAT-webinaire4-IOhttps://astrotube.obspm.fr/static/streaming-playlists/hls/1f0ee43f-676b-4ec5-ba81-abbab04ebff8/98c5bb24-db96-4c67-858c-51df06332bd7-master.m3u8https://astrotube.obspm.fr/videos/embed/4QrABZ7xrDtPLX9LaH7gJY4100062025-05-22T07:20:53.834ZYESECLATNOhttps://astrotube.obspm.fr/w/696fFX2MBQv3rWJg1Vj1Fihttps://astrotube.obspm.fr/lazy-static/thumbnails/dc6cab78-5b03-47c6-ac60-b787f2b921ce.jpgObsCast n°4 - 60 ans du Radiotéléscope décimétriqueObsCast n°4 - 60 ans du Radiotéléscope décimétriquehttps://astrotube.obspm.fr/static/streaming-playlists/hls/299ee182-372b-452f-87a9-06c7eadafac7/4c1161af-5d43-41d3-8864-5b7c286650ba-master.m3u8https://astrotube.obspm.fr/videos/embed/696fFX2MBQv3rWJg1Vj1Fi29500242025-05-26T10:01:52.919ZYESObscastNOhttps://astrotube.obspm.fr/w/rfgwFTzDgrdckJcekTyVAJhttps://astrotube.obspm.fr/lazy-static/thumbnails/5a75660d-f5d2-4d2d-aa17-31858731a3bc.jpgObsCastObsCasthttps://astrotube.obspm.fr/static/streaming-playlists/hls/cc72730d-a70a-48c8-9876-5bbc9089d322/ca9c3ed7-f010-43bf-8ac4-b893706dc290-master.m3u8https://astrotube.obspm.fr/videos/embed/rfgwFTzDgrdckJcekTyVAJ6052025-05-26T13:10:49.226ZYESMain atrentinella channelNOhttps://astrotube.obspm.fr/w/jUcNpvdsEdYyJSrh79G1eehttps://astrotube.obspm.fr/lazy-static/thumbnails/707dd182-4863-4c1c-9a4f-a243a06120c0.jpgWebinar ASNUM 02/06/25 : The Era of Big Data in Radio AstronomyJeff Wagg (OCA) Studying the faintest radio emitting objects in the Universe requires large single-dish telescopes, or multi-element interferometer arrays of either dishes or dipole antennas. The most ambitious of these is the international Square Kilometre Array Observatory (SKAO), consisting of two interferometers in Western Australia and the Karoo desert of South Africa. With a 50 year planned operational window, construction of these telescopes has begun, and is expected to be completed by the end of the decade. The data volume produced will approach an exabyte per year at full operations, necessitating a paradigm shift in the way we calibrate and image our data sets. In advance of the SKAO, pathfinder and precursor telescopes such as MeerKAT, LOFAR2.0, and ASKAP, are already generating large volumes of data and helping us to better prepare for, and understand the challenges. I will summarize the science cases, design, and expected data processing for the SKAO telescopes. The data processing model incorporates a global SKA Regional Center Network (SRCNet) with nodes hosted by several host countries. In France, we are contributing to this development and I will summarize some of the work and also give a preview for how we expect to support the French community in the future. I will also describe a European Commission funded project called SPECTRUM, which involves researchers and data infrastructure providers from the European radio astronomy and high energy physics community. The ambitious goal of SPECTRUM is to produce a technical blueprint and strategic roadmap for exabyte scale computing in the era of SKAO and upgraded experiments at CERN.https://astrotube.obspm.fr/static/streaming-playlists/hls/990e71a8-ec54-4363-b3c2-d62359f183ff/b33482d5-8e18-40e0-8c21-4ac2789ce85a-master.m3u8https://astrotube.obspm.fr/videos/embed/jUcNpvdsEdYyJSrh79G1ee26050192025-06-02T14:57:53.408ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/bXy1Wj8mgJ6q2wWdaJPjdFhttps://astrotube.obspm.fr/lazy-static/thumbnails/7f8194a7-42f0-4096-982d-3418cf6dcde1.jpgECLAT_webinaire5_IA&RFIECLAT_webinaire5_IA&RFIhttps://astrotube.obspm.fr/static/streaming-playlists/hls/58bd064c-3689-47d0-86ad-41d2da6be5ff/b1162b38-d186-4aa5-b502-e88dd07c3feb-master.m3u8https://astrotube.obspm.fr/videos/embed/bXy1Wj8mgJ6q2wWdaJPjdF3016092025-06-13T16:39:54.700ZYESECLATNOhttps://astrotube.obspm.fr/w/v8urbaABjbSd85YtDUjJokhttps://astrotube.obspm.fr/lazy-static/thumbnails/67a55d5a-c1d9-4791-a9b8-fd0c198f0593.jpg#WhatsInMyThorlabsBoxChallenge (La Globar va vous étonner)Je vous emmène avec moi pour ce super unboxing de ma toute dernière commande Thorlabs. Accrochez vos cheveux et mettez vos ceintures, parce qu'on va atteindre la troposphère (5) de l'excitation ! :D #viral #BuzzAvecUnDoubleZhttps://astrotube.obspm.fr/static/streaming-playlists/hls/ebe4c029-e90b-4ac4-bcf6-3c364220f9e7/73592ded-37d3-4f71-9bfe-0d24ddb9ae6f-master.m3u8https://astrotube.obspm.fr/videos/embed/v8urbaABjbSd85YtDUjJok1790352025-06-24T18:08:26.390ZYESMain epechevis channelNOhttps://astrotube.obspm.fr/w/jmL21gVUo5g6ZqoiBYrzohhttps://astrotube.obspm.fr/lazy-static/thumbnails/4160a5e9-1290-4333-a107-fb0db6bf85a6.jpgTier list snackboxJe sais pas si vous avez remarqué, mais y a deux types de fournisseurs de matériel optique : ceux qui envoient des snackbox et les autres. J'ai pas raison la team ? #balanceTaBoite #BringBackLesAnciennesThorlabsSnackshttps://astrotube.obspm.fr/static/streaming-playlists/hls/94aa7f77-9da2-431b-bae8-067378e9d438/ecebb957-2736-432d-9216-93bda18f7b08-master.m3u8https://astrotube.obspm.fr/videos/embed/jmL21gVUo5g6ZqoiBYrzoh435232025-07-12T19:48:27.299ZYESMain epechevis channelNOhttps://astrotube.obspm.fr/w/8XeB5zX8DNNAuvtsCbZRqahttps://astrotube.obspm.fr/lazy-static/thumbnails/17452bbe-0c95-41b2-9ac2-c5a98d8e01b1.jpgECLAT_webinaire6_KaraboPipelineECLAT_webinaire6_KaraboPipelinehttps://astrotube.obspm.fr/static/streaming-playlists/hls/40664321-b05d-4bc8-a2e0-ec03ee4a3465/71dd1c1e-2c79-4b54-805a-4d76747b43a8-master.m3u8https://astrotube.obspm.fr/videos/embed/8XeB5zX8DNNAuvtsCbZRqa16300312025-07-17T07:32:25.834ZYESECLATNOhttps://astrotube.obspm.fr/w/kvVBmMjFenn93LrHPaxppWhttps://astrotube.obspm.fr/lazy-static/thumbnails/674b78c8-150e-4f21-9edc-b6abcd4b99e3.jpgODISSEE-Internal-webinar2-DMODISSEE-Internal-webinar2-DMhttps://astrotube.obspm.fr/static/streaming-playlists/hls/9e0b3df2-1cd5-4c42-a837-e1b93cf66b30/79881c87-6a48-410c-b9f6-d9cc1ef73646-master.m3u8https://astrotube.obspm.fr/videos/embed/kvVBmMjFenn93LrHPaxppW2775082025-07-17T07:48:43.667ZYESODISSEENOhttps://astrotube.obspm.fr/w/jMigco3zBh6VHKBVpXQkpBhttps://astrotube.obspm.fr/lazy-static/thumbnails/75fbf8a5-692f-480d-be34-d622355f507b.jpgECLAT-webinaire7-IA&CommutECLAT-webinaire7-IA&Commuthttps://astrotube.obspm.fr/static/streaming-playlists/hls/98179a86-acfb-4491-8f33-2d6f941a9215/56dcdce4-6523-4bad-a851-d0ae9915818f-master.m3u8https://astrotube.obspm.fr/videos/embed/jMigco3zBh6VHKBVpXQkpB2335042025-09-18T08:29:42.844ZYESECLATNOhttps://astrotube.obspm.fr/w/cVx1CdgLwPQMcbnGejk9YGhttps://astrotube.obspm.fr/lazy-static/thumbnails/cd22e318-9595-41b4-bdb2-d4730feceba8.jpgOccultation de Venus par la LuneOccultation de Venus par la Lune le 19/09/2025 depuis le chercheur du télescope de 1m de l'observatoire de Meudonhttps://astrotube.obspm.fr/static/streaming-playlists/hls/608e0e5e-b2df-423a-a118-139d7276edb0/2f6e81f5-e8bc-411b-b0a9-dd704d3e6b6a-master.m3u8https://astrotube.obspm.fr/videos/embed/cVx1CdgLwPQMcbnGejk9YG640362025-09-20T13:52:11.739ZYESMain vlapeyrere channelNOhttps://astrotube.obspm.fr/w/r34pJg4Y6LwExtiZwREV8zhttps://astrotube.obspm.fr/lazy-static/thumbnails/4d06249c-7f84-483d-bc0f-45d788cbbdda.jpgWebinar ASNUM 13/10/25 : Hydrodynamical simulations of the reflex instability in protoplanetary...Clément Baruteau (IRAP) Theoretical studies of protoplanetary discs have a long history, with many works on what instabilities may grow, and how they impact disc evolution and planet formation. By running long-term hydrodynamical simulations of disc-planet interactions, we have recently (and quite unexpectedly) uncovered what seems to be yet another instability in non-axisymmetric discs. It is a linear instability that takes the form of a growing m=1 mode arising from the reflex motion of the star around the barycentre of the star-disc-planet system, and for this reason we refer to this instability as the reflex instability. It is found with a variety of grid-based codes as well as in smoothed particle hydrodynamics codes, and it is likely relevant to astrophysical discs other than protoplanetary discs. In this webinar I will tell you all we currently know about the reflex instability. https://astrotube.obspm.fr/static/streaming-playlists/hls/cabe0e13-3b0a-4f57-8813-3ca098f944ab/f889a2ba-9fa6-46c3-9c8e-f8837bb45ccf-master.m3u8https://astrotube.obspm.fr/videos/embed/r34pJg4Y6LwExtiZwREV8z36080192025-10-13T14:33:33.909ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/sUaVhY4XPpA6kE2dg1GXrkhttps://astrotube.obspm.fr/lazy-static/thumbnails/b4330a51-d416-4702-84d3-788bff959064.jpgECLAT-webinaire8-BDA-gridder-GPUECLAT-webinaire8-BDA-gridder-GPUhttps://astrotube.obspm.fr/static/streaming-playlists/hls/d9d664d6-a1bd-4b54-936b-41726eb91099/341bf7fd-7c6c-4c3f-8c37-36febe6b65a1-master.m3u8https://astrotube.obspm.fr/videos/embed/sUaVhY4XPpA6kE2dg1GXrk20190102025-10-14T10:14:13.238ZYESECLATNOhttps://astrotube.obspm.fr/w/3aC9v8otQYY3TNRVLHfsgEhttps://astrotube.obspm.fr/lazy-static/thumbnails/9b5e6fb6-5585-497f-8ad8-6580816ea2a2.jpgWebinar ASNUM 22/09/25 : Multiband image fusion under spectrally varying spatial blurs — Applicat...Nicolas Dobigeon : Toulouse INP Multiband image fusion has been extensively studied in the literature of Earth observation. This task aims at recovering a multiband image of high spatial and high spectral resolutions from complementary measurements of lower spatial or spectral resolutions. While several methods developed in this context are able to fuse multiband images efficiently, they are not suitable to handle astronomical images, in particular in the context of observations made by the James Webb Space Telescope (JWST). Beyond the high dimensionality of the data, one major challenge lies in the operators associated with spatial blurs that should be considered as spectrally varying. This crucial issue significantly increases the complexity of the forward models and makes the state-of-the-art fusion methods inoperative. The main contributions reported in this talk tackle both challenges: a framework is proposed to fuse large-scale astronomical data efficiently while taking into account the specificities of astronomical imaging. This framework is successfully applied to generate high angular resolution near-infrared hyperspectral cubes from real JWST NIRCam and NIRSpec data.https://astrotube.obspm.fr/static/streaming-playlists/hls/118a3f54-1e52-4c04-a46e-35dbf34a0834/46ee4010-7940-4c80-8588-8dfdf4edc946-master.m3u8https://astrotube.obspm.fr/videos/embed/3aC9v8otQYY3TNRVLHfsgE30120112025-10-21T14:36:44.137ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/7ojXAKn3MRW9MciNLpSomfhttps://astrotube.obspm.fr/lazy-static/thumbnails/6e2627f2-d3e5-465c-8407-5f415acf2b29.jpgODISSEE-Internal-webinar3-CRESTODISSEE-Internal-webinar3-CRESThttps://astrotube.obspm.fr/static/streaming-playlists/hls/33b4e0e9-02d5-44f6-9dbc-5efb893e146e/b758f199-c0ce-4836-babd-43ca7a3ecb8a-master.m3u8https://astrotube.obspm.fr/videos/embed/7ojXAKn3MRW9MciNLpSomf24020122025-10-22T12:46:22.954ZYESODISSEENOhttps://astrotube.obspm.fr/w/6SxJ8y5yjRrgq4SYTrbvUkhttps://astrotube.obspm.fr/lazy-static/thumbnails/daef182b-a76d-420c-bae8-494fe28b32a5.jpgWebinar ASNUM 10/11/25 : Proto-neutron star dynamos and magnetar formation: from simulations towa...Raphaël Raynaud (CEA) Magnetars are isolated, young neutron stars characterized by a diverse X-ray activity powered by the strongest magnetic fields in the Universe. These magnetic fields are expected to play a critical role in the dynamics of core-collapse supernovae. When combined with rapid rotation, magnetars may even power extreme explosions, like superluminous supernovae or hypernovae associated with long gamma-ray bursts. However, the formation mechanisms of these compact objects remain a key open question. A leading hypothesis involves magnetic field amplification by dynamo action in the nascent neutron star. I will review recent advances achieved through 3D-MHD HPC simulations and present how we can estimate the gravitational waves signature of proto-neutron star turbulence that could be probed in a Galactic supernova by the next generation of ground-based detectors. Additionally, I will present the first simulation of neutron star crust cooling initialized with dynamo-generated magnetic fields and show that this novel approach offers a promising avenue to bridge the gap between proto-neutron star simulations and observational signatures of magnetars.https://astrotube.obspm.fr/static/streaming-playlists/hls/2f8c6f12-a5a3-4c32-af46-4971c859b5ef/2e4f31d1-9ad6-4248-b273-2952a0dd4557-master.m3u8https://astrotube.obspm.fr/videos/embed/6SxJ8y5yjRrgq4SYTrbvUk34670202025-11-10T15:40:01.570ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/rqsf39mjPix2JCAHryEawXhttps://astrotube.obspm.fr/lazy-static/thumbnails/47c30f99-bef6-428e-bb6b-c4fc9bc5ebc4.jpgODISSEE-webinar2ODISSEE-webinar2https://astrotube.obspm.fr/static/streaming-playlists/hls/cdde7d3c-053b-4f9d-b719-10d1679d5717/97ffd2d3-bb0a-4529-980a-1992374c2136-master.m3u8https://astrotube.obspm.fr/videos/embed/rqsf39mjPix2JCAHryEawX35800152025-11-12T09:59:10.078ZYESODISSEENOhttps://astrotube.obspm.fr/w/fKWTQk7zDAYqvbEB894wjKhttps://astrotube.obspm.fr/lazy-static/thumbnails/2034da43-6bcf-4f78-9b09-3e289a384eca.jpgECLAT-webinaire9-DDNbenchmarkingECLAT-webinaire9-DDNbenchmarkinghttps://astrotube.obspm.fr/static/streaming-playlists/hls/7782c0b6-359d-4dab-b85e-ea34f697a28f/38f1b19f-f6ed-4e91-bd29-848cf4b27675-master.m3u8https://astrotube.obspm.fr/videos/embed/fKWTQk7zDAYqvbEB894wjK19830122025-11-24T11:52:16.030ZYESECLATNOhttps://astrotube.obspm.fr/w/mCqqQrJ5h9ZFpMMA6exxkLhttps://astrotube.obspm.fr/lazy-static/thumbnails/5b04a31e-35e7-40a0-b7bd-eb50d9316883.jpg2025-11-26 LIRA/PADC/ProAm Seminar: The Occultation Portal at Observatoire de Paris (OPOP) by Yuc... The Occultation Portal at Observatory of Paris Mercredi 26 novembre 2025, 16h30 Salle du Chateau à Meudon Séminaire LIRA/PADC/ProAM The Occultation Portal at Observatoire de Paris (OPOP): Migration and Institutional Integration Yücel Kılıc (IAA, Granada, Spain) The Occultation Portal (OP) is a scientific infrastructure originally developed within the ERC Lucky Star collaboration with groups from Paris, Meudon, Granada and Rio, and is now actively used in ongoing occultation-focused projects such as ACROSS and GaiaMoons. It supports the full workflow of stellar occultation studies, including prediction and campaign coordination, as well as the ingestion, validation, and long-term archiving of both video-based and photometric observations. With upcoming surveys such as LSST and future Gaia releases expected to significantly increase the number of observable events, ensuring the scalability and operational robustness of the OP has become essential. Over the past six months, the Occultation Portal has been migrated to the PADC/DIO infrastructure of the Paris Observatory and has undergone a broad technical modernisation. This work includes the implementation of a full MD5-based data-integrity framework, GDPR-compliant handling of user and observatory information, a redesigned user-registration and moderation workflow, an upgraded publication system with ADS-powered metadata ingestion linking scientific outputs to OP events and archived data, and extended prediction and mapping tools. Together, these developments greatly enhance the platform’s long-term stability and ensure that the OP continues to serve as a reliable infrastructure for advancing stellar occultation science.https://astrotube.obspm.fr/static/streaming-playlists/hls/a70c9a73-c565-4800-9a3d-80edfc96709e/2567ffe9-5e39-4e05-882d-273ebd85f6d2-master.m3u8https://astrotube.obspm.fr/videos/embed/mCqqQrJ5h9ZFpMMA6exxkL30200252025-11-27T07:11:00.694ZYESMain rsavalle channelNOhttps://astrotube.obspm.fr/w/pPftNnmFywfUKPkvGVyfmxhttps://astrotube.obspm.fr/lazy-static/thumbnails/4fec236c-074a-49fc-a3f9-f7b4676c556e.jpgODISSEE-Internal-webinar4-RadioPipelineODISSEE-Internal-webinar4-RadioPipelinehttps://astrotube.obspm.fr/static/streaming-playlists/hls/c0db11ce-6b7e-4880-ab37-4cffbd4f60af/f74b002e-bdbe-495b-a27c-e2ea5ab9d570-master.m3u8https://astrotube.obspm.fr/videos/embed/pPftNnmFywfUKPkvGVyfmx18940192025-12-17T13:20:19.660ZYESODISSEENOhttps://astrotube.obspm.fr/w/h9TsB9aTjapzxe9tsfRmP3https://astrotube.obspm.fr/lazy-static/thumbnails/734f6ddc-6f5d-4ec1-9981-2e5c4d2ab62c.jpgECLAT-webinaire10-CEPP-EvidenECLAT-webinaire10-CEPP-Evidenhttps://astrotube.obspm.fr/static/streaming-playlists/hls/82cfe19b-d4aa-43a1-a567-8b70a37cf800/d23c4cf9-9f24-480d-88a9-62f4edd540a8-master.m3u8https://astrotube.obspm.fr/videos/embed/h9TsB9aTjapzxe9tsfRmP329860152026-01-19T14:25:13.459ZYESECLATNOhttps://astrotube.obspm.fr/w/4d6QSZk99gFbepz1ESkbiXhttps://astrotube.obspm.fr/lazy-static/thumbnails/7afa7de1-2343-48b8-be6c-7da595fa1e7c.jpgWebinar ASNUM 26/01/26: Pixel-level analysis of weak lensing mapsNatalia Porqueres (CEA) Extracting the full information content of the weak lensing data requires analysis methods that are both highly precise and maximally informative. The standard analysis, based on correlation functions, discards information in the data and relies on simplifying assumptions in the physical and statistical modelling. In this talk, I will present a new approach for weak lensing analysis that employs a full physically-motivated model and field-level statistics. This approach analyses the lensing maps pixel by pixel, making optimal use of the data. As the proof of concept demonstrated, this method improves the cosmology constraints by up to a factor 5 and provides a digital copy of the Universe, mapping the dark matter density. I will discuss the current status and the techniques to meet the challenges of this approach for its first real data application.https://astrotube.obspm.fr/static/streaming-playlists/hls/19fbf122-e0f6-4700-8eb7-37e5b2326ed1/3608869e-ed42-4a2f-ab0e-98ca7d17beb1-master.m3u8https://astrotube.obspm.fr/videos/embed/4d6QSZk99gFbepz1ESkbiX22080162026-01-26T17:24:58.953ZYESASNUM webinarsNOhttps://astrotube.obspm.fr/w/ucEMr4fXL9sFRWChYs163shttps://astrotube.obspm.fr/lazy-static/thumbnails/12d71209-27ea-442b-9a15-1158bccfa37e.jpgTier list des domaines de la physique (la seule objective évidemment)Coucou les loulous ! Aujourd'hui, on se retrouve pour un concept un ptit peu spécial puisqu'on va faire la tierlist des domaines de la physique. N'hésitez pas à réagir en commentaire et sur Twitter ah ah xD Bref, cette description est déjà beaucoup trop longue donc je vous laisse regarder la vidéo et si vous souhaitez faire des retours, je n'accepte que les critiques positiveshttps://astrotube.obspm.fr/static/streaming-playlists/hls/e460f70b-2773-4653-beca-130130710ae2/d33c5a98-2a61-4590-8d43-72af7eb2c64d-master.m3u8https://astrotube.obspm.fr/videos/embed/ucEMr4fXL9sFRWChYs163s1590322026-02-13T21:44:00.653Zamusementtierlistphysiquevidéo spécialerigoladeYESMain epechevis channelNOhttps://astrotube.obspm.fr/w/kR9UDp64XDJmFbiXRLDCJkhttps://astrotube.obspm.fr/lazy-static/thumbnails/4a4771f8-1449-40b2-b59d-cb27683bf121.jpgODISSEE-Internal-Webinar5-InterLinkODISSEE-Internal-Webinar5-InterLinkhttps://astrotube.obspm.fr/static/streaming-playlists/hls/a0ba919d-e90c-43fc-86bf-f77cfc85c70f/ec4a2b75-b425-4c77-abf0-3c2f951f94af-master.m3u8https://astrotube.obspm.fr/videos/embed/kR9UDp64XDJmFbiXRLDCJk2684052026-02-23T09:43:11.031ZYESODISSEENOhttps://astrotube.obspm.fr/w/35dTv8mmaSdm36uEFtCnZzhttps://astrotube.obspm.fr/lazy-static/thumbnails/5628ff5f-d6ba-49bf-a9a3-4cb302b19c68.jpgECLAT-webinaire11-DDF-aaS-v3ECLAT-webinaire11-DDF-aaS-v3https://astrotube.obspm.fr/static/streaming-playlists/hls/10c931e4-803a-4b82-bdaf-a9ab8efc972f/68fae6a4-84b2-4941-8ab9-d6fdee378204-master.m3u8https://astrotube.obspm.fr/videos/embed/35dTv8mmaSdm36uEFtCnZz28840192026-02-26T06:12:51.350ZYESECLATNOhttps://astrotube.obspm.fr/c/rouan_channel/videoshttps://astrotube.obspm.fr/c/bcensier_channel/videoshttps://astrotube.obspm.fr/c/sevin_channel/videoshttps://astrotube.obspm.fr/c/lesidaner_channel/videoshttps://astrotube.obspm.fr/c/bsegret_channel/videoshttps://astrotube.obspm.fr/c/luth_seminar/videoshttps://astrotube.obspm.fr/c/mhosokawa_channel/videoshttps://astrotube.obspm.fr/c/yafits/videoshttps://astrotube.obspm.fr/c/leste_channel/videoshttps://astrotube.obspm.fr/c/mmontarges_channel/videoshttps://astrotube.obspm.fr/c/balbert_channel/videoshttps://astrotube.obspm.fr/c/salome_channel/videoshttps://astrotube.obspm.fr/c/imcce/videoshttps://astrotube.obspm.fr/c/brillet_channel/videoshttps://astrotube.obspm.fr/c/partemix_channel/videoshttps://astrotube.obspm.fr/c/comimcce_channel/videoshttps://astrotube.obspm.fr/c/adoussot_channel/videoshttps://astrotube.obspm.fr/c/escape_game/videoshttps://astrotube.obspm.fr/c/rsavalle_channel/videoshttps://astrotube.obspm.fr/c/gvoisin_channel/videoshttps://astrotube.obspm.fr/c/formation_galexy_utilisateurs_fonctionnalites/videoshttps://astrotube.obspm.fr/c/aschaaf_channel/videoshttps://astrotube.obspm.fr/c/atrentinella_channel/videoshttps://astrotube.obspm.fr/c/webinaires_asov/videoshttps://astrotube.obspm.fr/c/sno_ramses/videoshttps://astrotube.obspm.fr/c/vlapeyrere_channel/videoshttps://astrotube.obspm.fr/c/mss/videoshttps://astrotube.obspm.fr/c/obscast/videoshttps://astrotube.obspm.fr/c/eclat/videoshttps://astrotube.obspm.fr/c/epechevis_channel/videoshttps://astrotube.obspm.fr/c/odissee/videoshttps://astrotube.obspm.fr/a/rouan/video-channelshttps://astrotube.obspm.fr/a/bcensier/video-channelshttps://astrotube.obspm.fr/a/sevin/video-channelshttps://astrotube.obspm.fr/a/lesidaner/video-channelshttps://astrotube.obspm.fr/a/bsegret/video-channelshttps://astrotube.obspm.fr/a/meliani/video-channelshttps://astrotube.obspm.fr/a/mhosokawa/video-channelshttps://astrotube.obspm.fr/a/nmoreau/video-channelshttps://astrotube.obspm.fr/a/mbugnon_olano/video-channelshttps://astrotube.obspm.fr/a/leste/video-channelshttps://astrotube.obspm.fr/a/mmontarges/video-channelshttps://astrotube.obspm.fr/a/balbert/video-channelshttps://astrotube.obspm.fr/a/salome/video-channelshttps://astrotube.obspm.fr/a/brillet/video-channelshttps://astrotube.obspm.fr/a/partemix/video-channelshttps://astrotube.obspm.fr/a/comimcce/video-channelshttps://astrotube.obspm.fr/a/adoussot/video-channelshttps://astrotube.obspm.fr/a/rsavalle/video-channelshttps://astrotube.obspm.fr/a/gvoisin/video-channelshttps://astrotube.obspm.fr/a/thedroug/video-channelshttps://astrotube.obspm.fr/a/aschaaf/video-channelshttps://astrotube.obspm.fr/a/atrentinella/video-channelshttps://astrotube.obspm.fr/a/alebrun/video-channelshttps://astrotube.obspm.fr/a/vlapeyrere/video-channelshttps://astrotube.obspm.fr/a/dgratadour/video-channelshttps://astrotube.obspm.fr/a/epechevis/video-channels