Title: Asymmetric supernovae explosions: theory and experiment  

　Speaker: Thierry Foglizzo (CEA Saclay, France)　　  

　Time: Tuesday,10:00am, Nov 25th　　  

　Location: the middle conference room　　  

　Abstract: The explosive death of massive stars starts with the collapse of their coreand the formation of a neutron star. Understanding the reversal of the collapse into an explosion is still a challenge despite decades of theoretical efforts.The breaking of spherical symmetry is triggered by the development of hydrodynamical instabilities, which affect the kick and spin of the neutron star and favour an asymmetric explosion. Neutrino driven convection and the Standing Accretion Shock Instability (SASI) are the dominant instabilities,depending on the structure of the progenitor. I will characterize the properties and consequences of these instabilities using simplified numerical simulations, and a shallow water experiment named SWASI. The first results from a new version of the SWASI experiment illustrate the dynamical effects of rotation in the collapsing core.