le 27 octobre 2023, 10h45 à 12h45, Victor Réville, salle Jules Verne, OMP, site Belin Resumé: Magnetic reconnection is a fundamental process in astrophysics. It allows converting magnetic into thermal and kinetic energy in astrophysical plasmas. In the solar atmosphere, it has been associated with solar storms, flares, and the release of energetic particles and […]
le 15 décembre 2023, 10h45 à 12h45, Fernando Cruz, salle Jules Verne, OMP, site Belin Resumé: Accretion is among the most important physical processes during the formation of stars. Eruptive young stars are young stellar objects (YSOs) that experience sudden and dramatic accretion outbursts, where the mass accretion rate can increase by up to 5 […]
le 8 décembre 2023, 10h45 à 12h45, Pierre Marchand, salle Jules Verne, OMP, site Belin Resumé: Magnetic fields play a major role during the formation of stars. From the interstellar medium where they act on the formation on pre-stellar cores, to protoplanetary disks in which they regulate angular momentum and create outflows, an accurate description […]
le 1 décembre 2023, 10h45 à 12h45, Guillaume Loizelet, salle Jules Verne, OMP, site Belin Resumé: In this session, I will review the results obtained by historians of astronomy over the last fifty years, which have led to a complete rethinking of the idea of a scientific revolution developed in the mid-twentieth century.I will first […]
le 24 novembre 2023, 10h45 à 12h45, Guillaume Loizelet, salle Jules Verne, OMP, site Belin Resumé: Using the available databases, it was possible for ancient « astronomers » to propose models to account for observable celestial movements. The climax of these attempts is undoubtedly the great mathematical synthesis (known as the Almagest) written in Greek by the […]
le 17 novembre 2023, 10h45 à 12h45, Guillaume Loizelet, salle Jules Verne, OMP, site Belin Resumé: It is not possible to develop a mathematical model without a reliable and consistent database.In this session, I will first detail the cultural context that led the Babylonian « astronomers » to establish formidable data collections in the form of clay tablets. […]
le 10 novembre 2023, 10h45 à 12h45, David Tsang, salle Jules Verne, OMP, site Belin Resumé: I will discuss the basic structure of Neutron stars, including the Tolman-Oppenheimer-Volkoff equations, the dense matter equation of state, and the properties of the neutron star crust and core. I will then discuss how asteroseismic modes of a neutron star […]
le 20 octobre 2023, 10h45 à 12h45, Katia Ferrière, salle Jules Verne, OMP, site Belin Resumé: Magnetic fields are ubiquitous in the Universe. Most celestial bodies, from planets to stars to galaxies, appear to be magnetized. Even intergalactic space could be threaded by a magnetic field. Cosmic magnetic fields generally play an important role. They […]
le 13 octobre 2023, 10h45 à 12h45, Sylvestre Maurice, salle Jules Verne, OMP, site Belin Resumé: