Colloquium on Nov. 26, 2020

Impact of supernova explosions on binary companions and its diverse implications

Speaker: Ryosuke Hirai (Monash Univ.)

Venue: Video Conference

Time: 16:00 PM, Thursday, Nov. 26, 2020

Abstract:

Stripped-envelope supernovae are a subclass of core-collapse supernova explosions that lack hydrogen in their spectra. The current prevailing theory is that the outer hydrogen layer of the supernova progenitor was removed through interactions with a binary companion. If this is the case, the binary companion should still remain in the aftermath of the supernova, with possible traces of it being impacted by the explosion. Many attempts have been made to confirm the existence of a remaining companion in the remnants of stripped-envelope supernovae. Some cases have led to a successful detection such as SN2006jc. On the other hand, some cases such as Cassiopeia A have strong constraints on any remaining companion posing a serious problem for the binary hypothesis. In this talk, I will discuss the outcomes of supernova explosions in binary systems and what we can learn from post-supernova companion detections and non-detections. In particular, I will present a new scenario for the formation of single stripped-envelope supernova progenitors, that can explain the origin of the Cassiopeia A progenitor.

Report PPT:  SWIFAR_Ryosuke Hirai.pdf