2022-12-14 15:10  P5A-1/Online

[Journal Club] Non-Radial Neutrino Emission upon Black Hole Formation in Core Collapse Supernovae

Dr. Jia-Shian Wang

When a core-collapse supernova fails to explode or barely exploded, i.e., unable to unbind most of the stellar envelope, the associated proto-neutron star is expected to eventually implode into a black hole. In this scenario, the neutrino luminosity spectrum will then see an abrupt end as a result of the engulfment of the luminous core and the increasing gravitational redshift. The dynamics of this violent cut-off is, however, not fully explored and, as a result, is usually treated by considering only specific trajectories. In this study, a full ray-trace treatment is performed to give a more comprehensive account on the potential effects of the contributions from neutrino emissions over all possible angles. Furthermore, the case rotating black holes will also be investigated using the Kerr metric. It is discovered that the contribution of the non-radial geodesics results in a moderation of the sharp cut-off, where the introduction of rotation is found to further enhance such moderation. In addition, potential effects introduced by more realistic considerations are also discussed.