-
Dr Anais Möller (CNRS / LPC Clermont)14/09/2021 09:30
In this talk, I will present the Vera Rubin Observatory Legacy Survey of Space and Time (VRO LSST). During the next decade, VRO will obtain high-resolution optical images of the Southern Sky at unprecedented depths. LSST is designed to address four science areas: probing dark energy and dark matter, taking an inventory of the solar system, exploring the transient optical sky and mapping the...
Go to contribution page -
Edward Porter (APC/CNRS)14/09/2021 09:55
After a brief summary of results of LIGO-Virgo O3 observational run, I will present the future plans for the LIGO-Virgo-KAGRA network. I will then discuss the status and plans for the third generation detectors, Einstein Telescope and Cosmic Explorer. Finally, I will review the scientific potential of the upcoming detectors and the connections with the PNHE community.
Go to contribution page -
Antoine Petiteau (APC - Université Paris-Diderot)14/09/2021 10:20
The Laser Interferometer Space Antenna (LISA) is the large mission of ESA for observing gravitational waves (GW) from space. It has a huge science case and will observe a large number of GW sources making an important contribution to the multi-messenger astronomy. LISA is finishing its phase A and will be launched mid-2030s. In this talk, we will briefly describe the mission, give its current...
Go to contribution page -
Marta Volonteri14/09/2021 11:00
The joint detection of gravitational waves and an electromagnetic counterpart from a neutron star merger in 2017 has been a major breakthrough in astrophysics. Massive black holes, 1e4-1e10 Msun, which power quasar and inhabit the center of most galaxies, are also expected to merge and be very strong gravitational wave emitters, with various electromagnetic signatures accompanying the inspiral...
Go to contribution page -
Irina Dvorkin (Institut d'Astrophysique de Paris)14/09/2021 11:25
The gravitational-wave observatories LIGO and Virgo have so far detected several tens of stellar-mass compact binary mergers, but many more sources, too faint to be detected, lurk below the noise, creating a stochastic background. On the other end of the mass scale, super-massive binary black hole mergers are expected to create a stochastic background observable with pulsar timing arrays. I...
Go to contribution page -
Jérôme Guilet (CEA Saclay, Département d'Astrophysique)14/09/2021 11:50
L’effondrement du coeur de fer des étoiles massives donne naissance aux objets compacts et à une diversité d’explosions. Je décrirai des travaux théoriques et numériques développés pour comprendre les propriétés de l’objet compact et de l’explosion associée. Des instabilités hydrodynamiques telles que SASI ou la convection due aux neutrinos jouent un rôle important pour déclencher l’explosion...
Go to contribution page -
Micaela Oertel (LUTH, Observatoire de Paris)14/09/2021 12:15
The first detection of gravitational waves (GWs) from a binary neutron
Go to contribution page
star merger (GW170817) by the LIGO-Virgo collaboration together with
an electromagnetic counterpart has brilliantly given birth to
multi-messenger astronomy. In the coming years, the GW detector
network sensitivity will be further increased making this rapidly
evolving new astronomy challenge our understanding of hot... -
Prof. Frédéric Daigne (Institut d'Astrophysique de Paris - Sorbonne Université)14/09/2021 14:30
Dans cet exposé, je présenterai les enjeux scientifiques de l’étude des sursauts gamma et des sources astrophysiques d’ondes gravitationnelles qui produisent également de la lumière. L’accent sera mis dans ce second cas sur les coalescences de système binaires d’objets compacts. J’essaierai de résumer quelles sont les principales questions qui se posent sur la compréhension physique de ces...
Go to contribution page -
Bertrand Cordier (CEA)14/09/2021 14:55
A partir de 2023 la mission spatiale franco-chinoise SVOM sera opérationnelle. Elle sera suivie par la mission spatiale chinoise Einstein Probe à laquelle nous contribuons plus modestement. Dans cet exposé je vous présenterai rapidement ces deux missions dédiées au ciel transitoire, leurs caractéristiques principales et leurs complémentarités. Enfin dans le contexte du "time domain astronomy"...
Go to contribution page -
Damien Dornic (CPPM)14/09/2021 15:20
IceCube et ANTARES ont détectés le flux diffus de neutrinos de haute énergie et commencent à voir les premieres évidences des sources de ces neutrinos. Aprés avoir fait un petit panorama des principaux résultats actuels, je vous montrerais ce qu’on peut faire avec KM3NeT, la prochaine génération de télescope à neutrino dans la Méditerranée. A l’heure actuelle, 6 lignes de détection sont en...
Go to contribution page -
Pierre Duverne (IJClab)14/09/2021 15:45
The combination of electromagnetic and gravitational-wave data provides
Go to contribution page
a unique opportunity to study the evolution of compact binary systems.
Although the kilonova detection AT2017gfo in association with
gravitational waves led to groundbreaking results in our understanding
of the binary neutron star scenario, many open questions remain.
Answering these questions requires early... -
Sarah ANTIER (APC)14/09/2021 16:20
Les rencontres TS2020+ (financées par le PNHE) rassemblent de manière régulière les chercheurs et les chercheuses de la communauté française d’étude multi-longueurs d’onde et multi-messagers du ciel variable et transitoire. Les objectifs sont de faire le lien entre les grandes collaborations instrumentales concernées (CTA, GRANDMA, Ligo/Virgo, Rubin/LSST , SKA, SVOM, …) , de présenter les...
Go to contribution page -
Dr Jérôme Margueron (CNRS/IN2P3 - IP2I - Lyon)14/09/2021 16:45
This talk will give a brief summary of the activities of the GdR RESANET at the interface between nuclear physics and astrophysics. It will present activities in measurements of nuclear cross sections for astrophysical processes and in the modelling of neutron stars and associated phenomena, such as for instance gravitational wave physics.
Go to contribution page -
Chiara Caprini (APC)14/09/2021 17:05
Ce séminaire présentera le GdR Ondes Gravitationnelles, son rôle, sa structure, ses groupes de travails et ses actions récentes
Go to contribution page -
DIDIER BARRET (IRAP)15/09/2021 09:00
Athena is the second large mission of the Cosmic Vision science program of the European Space Agency. Dedicated to the study of the Hot and Energetic Universe, Athena will carry a large aperture X-ray telescope, and two complementary focal plane instruments: the Wide Field Imager (WFI) and the X-ray Integral Field Unit (X-IFU). In this talk, I will briefly recall the prime scientific...
Go to contribution page -
Dr Natalie Webb (IRAP)15/09/2021 09:25
The large European Space Agency (ESA) X-ray observatory, XMM-Newton, has been observing the X-ray, ultra-violet and optical sky for over 21 years, resulting in
Go to contribution page
almost a million X-ray detections and nearly 9 million detections in the UV and
optical. Many highly variable sources have been discovered in the data once it is made available in the catalogues put together by the XMM-Newton Survey... -
Fabio Acero (CEA/Saclay)15/09/2021 09:50
The Athena X-ray observatory is a L-class mission selected by ESA in its Cosmic Vision program to be launched in early 2030s. Successor of the XMM-Newton telescope, it will embark a revolutionary spectro-imager X-IFU using micro-calorimeter technologies allowing a breakthrough 2.5 eV spectral resolution compared to ~150 eV for XMM-Newton.
In this contribution I will review the science cases...
Go to contribution page -
Dr pierre-olivier petrucci (IPAG)15/09/2021 10:10
X-ray satellites like XRISM (to be launched in early 2023) and, in a more distant future, Athena (2030+), will revolutionize our spectral view of compact objects. Thanks to their onboard calorimeters, they will provide an energy resolution of a few eV in the broad band (~1-10 keV) X-ray range, a factor several tens of times better than present satellites, especially above 6 keV.
Go to contribution page
I will... -
Frédéric Marin (Observatoire astronomique de Strasbourg)15/09/2021 10:45
50 years after the pioneering experiments, X-ray spectroscopy and timing techniques can be considered as well established. Nonetheless, one prominent feature of X-ray light has not been explored as scrupulously as others: its polarization. Between 1980 and 2000, the instruments were not sensitive enough to go beyond the first X-ray polarimetric results acquired in the 70s but the development...
Go to contribution page -
15/09/2021 11:05
-
Stephane Corbel (University Paris Diderot & CEA Saclay)15/09/2021 11:30
La radio-astronomie vit actuellement une révolution majeure avec la mise en place de SKA au niveau mondial et le développement de précurseurs et éclaireurs à travers le monde. Depuis 2021, la France est officiellement rentrée dans SKA. Les précurseurs (e.g. MeerKAT) tournent à plein régime, et à très basses fréquences, un nouvel observatoire très sensible (NenuFAR) se met en place à la Station...
Go to contribution page -
Gilles THEUREAU (GEPI, Paris Observatory and LPC2E, CNRS-Orléans)15/09/2021 11:55
The study of pulsars started at the Nançay Observatory in the mid-1980s, after the discovery of the first millisecond pulsar. Since then, several generations of instruments have been developed as well as a wide spectrum of projects ranging from the characterisation of emission processes or the production of precise ephemerides for high energy observatories to the use of pulsars as natural...
Go to contribution page -
15/09/2021 12:20
-
Etienne Parizot (APC - University Paris 7)15/09/2021 14:00
L'étude des rayons cosmiques d'ultra-haute énergie (UHECRs) s'inscrit dans un effort global d'élucidation des phénomènes cosmiques de très haute énergie. La dernière décennie d'observation des UHECRs a permis d'affiner considérablement les mesures et d'accroître le volume de données disponibles. Si ces progrès n'ont pas encore conduit à l'identification des sources, ni éclairé autant qu'il...
Go to contribution page -
Luigi Tibaldo (IRAP)15/09/2021 14:30
The Cherenkov Telescope Array (CTA) will soon observe the sky in the energy range from a few tens of GeV to 300 TeV with unprecedented sensitivity and improved angular and energy resolution with respect to current-generation instruments. The science case for CTA covers a broad range of topics: the origin and role of cosmic rays, extreme astrophysical objects, and exploring the frontiers of...
Go to contribution page -
Philippe Laurent (CEA/SAp & APC)15/09/2021 14:55
L'astronomie gamma de basse énergie explore de nombreux domaines de recherche en astrophysique (pulsars, trous noirs, noyaux actifs de galaxie, nucléosynthèse, ...). Elle garde un grand potentiel de découvertes, tout particulièrement en lien avec l'astronomie des phénomènes rapides et l'astronomie multi-messagers. Pendant cette présentation , je ferai un état des lieux rapide des thèmes les...
Go to contribution page -
Jean Ballet (AIM, CEA Saclay)15/09/2021 15:20
The bulk of the cosmic rays we see at Earth are at a few GeV. Most of them are expected to be accelerated in old supernova remnants (10 000 yrs and more). Indeed many old SNRs are readily observed in GeV gamma rays, and those interacting with interstellar clouds are particularly bright.
Go to contribution page
The GeV emission is essentially pio0-decay, but can be due to two acceleration mechanisms:
-... -
M. Antonin Pierron (SYRTE - Observatoire de Paris)15/09/2021 15:40
With the advent of the European Gaia astrometry mission and the constantly improving geodetic VLBI program who now provide both optical and radio reference frames with precisions better than 0.1 mas, challenging questions arise about the location of the optical centroid with respect to the radio one in extragalactic radio sources. We propose a study aiming at identifying which mechanisms are...
Go to contribution page -
15/09/2021 16:00
-
Olivier Martineau (IN2P3)15/09/2021 16:45
Nosu présentons ici le status du projet "Giant Radio Array for Neutrino detection" qui vise à déployer à travers le monde un réseau de détecteurs radio constitués chacun de 10'000 antennes environ, afin de rechercher des neutrinos cosmisques d'ultra haute énergie.
Go to contribution page
Nous présenterons en particulier le status du prototype GRANDProto300, qui vise à démontrer le principe de détection de GRAND au... -
15/09/2021 17:05
-
Benoît Cerutti (Institut de Planétologie et d'Astrophysique de Grenoble / Université Grenoble Alpes)16/09/2021 09:30
Les simulations PIC ont révolutionné notre compréhension des phénomènes dissipatifs et d'accélération de particules dans les plasmas spatiaux et astrophysiques. Au cours de la dernière décennie, ces véritables observatoires et microscopes numériques ont rencontré de nombreux succès dans la communauté française, comme l'étude des chocs non-collisionnels, la reconnexion magnétique, ou encore...
Go to contribution page -
Arno Vanthieghem (SLAC National Accelerator Laboratory)16/09/2021 09:55
Microturbulence produced by plasma instabilities plays an important role in the dynamics and dissipation mechanisms of relativistic astrophysical collisionless shocks, such as those associated with gamma-ray bursts and blazar environments. We present the tenets of an analytical model that describes the dynamics of the precursor of relativistic unmagnetized collisionless shock waves in...
Go to contribution page -
Virginia Bresci16/09/2021 10:15
Pulsar Wind Nebulae (PWNe) are complex astrophysical environments where an highly magnetized wind made of electron-positron pairs interacts with the surrounding SN remnant through a relativistic shock wave. While MHD modelling can reproduce the large-scale morphology of PWNe, a refined description of the underpinning kinetic-scale processes is still missing. One open question in this regard is...
Go to contribution page -
Alexis Marret (LERMA)16/09/2021 10:35
The non-resonant streaming instability leads to the generation of large amplitude magnetic field fluctuations, and may play an essential role in the acceleration of cosmic rays. We present a study of the non-resonant streaming instability in non-ideal plasma environments with finite temperature and collisionality. We have extended the existing kinetic theory to the case of large plasma...
Go to contribution page -
Dr Alexandre Marcowith (LUPM)16/09/2021 11:05
Cosmic Rays with energies below a fraction of EeV are coming from our galaxy but the way they are produced and they propagate to the Earth is still widely unknown. I will address recent progresses made in our understanding of Cosmic Ray acceleration and propagation on the point of view of microphysics and phenomenological studies. Then, I will shortly discuss why Cosmic Rays feed back are...
Go to contribution page -
Vincent Tatischeff (CSNSM)16/09/2021 11:30
Galactic cosmic-rays (GCRs) are thought to be accelerated in strong shocks induced by massive star winds and supernova explosions sweeping across the interstellar medium. But the phase of the interstellar medium from which the CRs are extracted has remained elusive up to now. We have studied in detail the GCR source composition deduced from recent measurements by the AMS-02, Voyager 1 and...
Go to contribution page -
16/09/2021 11:50
-
Julien Lavalle (Lab. Univers et Particules de Montpellier (LUPM))16/09/2021 14:00
Unsuccessful searches for new physics in the TeV domain at the LHC so far cast some doubt about the predictivity level of some theoretical frameworks beyond the standard model of particle physics that lead to dark matter candidates. Hierarchies among scenarios have been reshuffled and are now more and more ruled according to the plausibility of dark matter production in the early universe....
Go to contribution page -
Gernot Heißel (Observatoire de Paris / LESIA)16/09/2021 14:25
Context. The Schwarzschild precession of the star S2 which orbits the massive black hole at the centre of the milky way could recently be detected with $\sim12\,\text{arc-minutes}$ per orbit by GRAVITY Collab. et al. (2020). The result also improved the $1\sigma$ upper bound on a possibly present dark continuous extended mass distribution (e.g. faint stars, stellar remnants, stellar mass...
Go to contribution page -
Joanna Berteaud (LAPTh CNRS)16/09/2021 14:45
The Fermi GeV excess has kept physicists busy for the past decade. First attributed to dark matter annihilation, the favored explanation to date is an unresolved population of millisecond pulsars (MSPs), hiding in the Galactic Bulge. In order to prove this hypothesis, a multi-wavelength study is now needed. In a recent work [arXiv:2012.03580], we demonstrated that if the GeV excess is caused...
Go to contribution page -
Frederic Vincent (Observatoire de Paris / LESIA)16/09/2021 15:05
The planet-size network of millimeter antennas Event Horizon Telescope (EHT) has recently deliv-ered images of the surroundings of the supermassive compact object M87* at the center of the galaxy Messier 87. Such images are crucial to better understand the physics at play in a strong gravitational field environment. They might also allow to probe the extreme relativistic effects on the...
Go to contribution page -
Frédéric Marin (Observatoire astronomique de Strasbourg)16/09/2021 15:25
Polarimetry has proven to be one of the most resourceful observational methods in astronomy, but it is probably in the field of quasars that polarimetry contributed the most. And what better waveband to observe quasars than in the ultraviolet? This is both where the quasar's central engine (a supermassive black hole and its accretion disk) emit the most, and where the polluting starlight...
Go to contribution page -
Virginia Bresci
-
Jean Ballet (AIM, CEA Saclay)
-
Olivier Martineau (IN2P3)
-
Olivier Martineau (IN2P3)
-
Antonin Pierron (SYRTE - Observatoire de Paris)
-
-
Fabio Acero (CEA/Saclay)
-
Frédéric Marin (Observatoire astronomique de Strasbourg)
-
Gernot Heißel (Observatoire de Paris / LESIA)
-
Alexis Marret (LERMA)
-
Vincent Tatischeff (CSNSM)
-
Frédéric Marin (Observatoire astronomique de Strasbourg)
-
pierre-olivier petrucci (IPAG)
Choisissez le fuseau horaire
Le fuseau horaire de votre profil: