Lunch talk on Sep. 25, 2023

The progenitors of hydrogen-poor core-collapse supernovae

Speaker:Ning-Chen Sun (UCAS)

Venue:Video Conference

Time:12:30 PM, Monday, Sep. 25, 2023

Abstract:

Core-collapse supernovae (SNe) are the spectacular explosions of dying massive stars. Understanding the progenitors of different SN types is a key topic in the era of time-domain astronomy. Although ~30 direct progenitor detections have been made from pre-explosion images, many outstanding questions still remain unresolved. In particular, it is very difficult to detect the progenitors of hydrogen-poor SNe, and it is still unknown whether they arise from very massive Wolf-Rayet stars stripped by stellar wind or from moderately massive stars stripped by binary evolution. In order to overcome this difficulty, we use alternative tracers to probe the SN progenitors, such as their companion stars, host star clusters, and the surrounding environments. In this talk, I will introduce our recent work on the progenitors of various types of hydrogen-poor SNe (IIb, Ib, Ic, Ibn, and those with spectral transformation from Ib to IIn). Our work shows that binary interaction plays a dominant role in stripping the hydrogen envelope while stellar wind mass loss may be important in removing the helium envelope. In the future, the CSST high-resolution survey and the high-cadence transient surveys will further promote our understanding of SN progenitors.

Report PPT:SWIFAR_Ning-Chen Sun.pdf