Core-collapse of fast rotators in the early universe

Abstract:

It is widely believed that the fast rotation of a massive star affects the dynamics of core-collapse and eventually results in the most luminous event in the present universe, the long gamma-ray burst (LGRB). Another important consequence of the fast rotation would be an energetic supernova explosion, which is often observed to be associated with LGRBs. However, the driving mechanisms for both LGRBs and energetic supernovae have not yet been clearly understood. The zero-metallicity environment in the early universe is considered to be favorable for the formation of such fast rotators. Moreover, zero-metallicity may also be a key condition to form very massive stars with initial masses of over 100 solar masses. We have investigated what are the outcomes of core-collapse of massive and very massive fast rotators using full-GR hydrodynamic simulations. I will present our latest results.