Exploring collapsar scenarios in numerical relativity

by Masaru Shibata (AEI Potsdam & Kyoto U)

Thursday 7 Sept 2023, 13:30 → 14:30 Europe/Copenhagen

Aud A

There will be a student session at 13:10 before the main talk.

The collapsar model is the widely accepted for explaining the central engine of long gamma-ray bursts. We performed neutrino-radiation viscous- and magneto-hydrodynamics simulations in full general relativity for collapses of massive rotating stars which was obtained by stellar evolution calculation of Aguilera-Dena et al. Viscous-hydrodynamics simulations show the explosion of entire stars by the energy injection from massive and compact torus around the formed black hole. For massive progenitor stars, the explostion energy can be ~ 10^{52} erg with the Ni prodiction larger than 0.15 solar mass, which may explain a class of high-energy supernovae (e.g., broad-lined type Ic supernovae).

Magneto-hydrodynamics simulations show the jet launches by the Blandford-Znajek mechanism if a poloidal magnetic field that penetrates a spinning black hole is present. It is also shown that magneto-centrifugal effects associated with the black-hole spin can be the source of the stellar explosion with high explosion energy of 10^{52} erg.