Daniel Price (Monash U.) Our solar system makes it seem like the planets were formed in a nice, ordered disc. But dig a little deeper and there are hints that things are not quite as neat as they seem — spins do not align, dust appears to have been violently melted and the planetesimal disc […]
Soutenance de thèse de Jonathan Oers (Salle de Conférence) Résumé de la thèse : L’objecf de la thèse est d’étudier l’orientation du champ magnétique en direction des cœurs denses détectés avec Planck et Herschel et de leur structure environnante (filaments). Cette analyse sera basée sur les observations de l’émission polarisée des grains de poussière avec […]
Soutenance de thèse de Trung Tin DINH (Salle Coriolis) Résumé de la thèse :L’imagerie hyperspectrale enregistre simultanément l’information spatiale et spectrale d’une scène, chaque pixel étant décrit par un spectre de quelques dizaines à quelques centaines de bandes. Cette richesse spectrale ouvre la voie à de nombreuses applications, dont certaines reposent sur la classification spectrale pour différencier et identifier […]
Soutenance de thèse de Paul Charpentier (Salle Coriolis) Résumé de la thèse : Depuis la découverte des premières exoplanètes à l'aide de la méthode de la vitesse radiale (RV) il y a 30 ans, les techniques de détection ont été continuellement perfectionnées. À l'heure actuelle, les spectromètres optiques les plus récents offrent une précision 10 […]
Federica Bradascio (IJCLab) For more than a decade, multi-messenger astrophysics has opened new windows onto the most energetic phenomena in the Universe. This field combines complementary messengers such as electromagnetic radiation ranging from radio waves to gamma rays, neutrinos, and gravitational waves, in order to probe the physical processes powering cosmic accelerators. In this presentation, […]
Soutenance de HDR d'Agnès Cousin (Salle Lyot, OMP) Composition du jury
Ian Hothi (OBSPM, LPENS) The Epoch of Reionization corresponds to the times during which the first stars and galaxies formed in the Universe. In radio astronomy, the so-called "21cm line" is the most direct probe of this epoch, offering a true 3D view of how the intergalactic medium is heated and ionised. Current telescopes (LOFAR, […]
Aurélie Astoul (IRAP) Tidal interactions are a key driver of the orbital and rotational evolution of close stellar and (exo-)planetary systems. In stars and gaseous planets, the tidal response can manifest as tidal waves, whose energy is expected to be significantly dissipated and allows for an efficient redistribution of angular momentum within the system. In […]
Alexis Rouillard (IRAP, Leibniz IAP) On Christmas Eve 2024, after seven Venus flybys to adjust its orbits closer to the Sun, the Parker Solar Probe reached its closest approach to the solar surface, at a distance of just under nine solar radii. The first seven years of this incredible mission have provided in situ measurements […]
Katarina Kraljic (ObAS) The strikingly anisotropic large-scale distribution of matter, the so-called cosmic web, is made of an extended network of voids delimited by sheets, themselves segmented by high-density filaments, within which matter flows towards compact nodes where they intersect. Do the properties of galaxies, such as their mass, star formation rate or morphology, retain […]