题目：Probe of Supernova Progenitors with Gamma-ray Observations

　　报告人：王伟教授，武汉大学

　　摘要：Supernovae (SNe) have the subclasses of core-collapse supernovae (Type II, Type Ib/Ic) and thermonuclear explosions (Type Ia). However, the central explosion mechanisms for the different types of SNe are not well understood. The radioactivity isotopes, i.e., 44Ti and 56Ni, are produced in the central explosion region of SNe. Detection of the gamma-rays emitted by these isotopes are unique tools to constrain the mechanism of supernova explosions and supernova progenitors. I will introduce the recent results of gamma-ray observations: constraining explosion mechanism of core-collapse SNe by detecting 44Ti in CAS A and SN 1987A; progenitors of Type Ia SNe probed by 44Ti in Tycho and 56Ni in SN 2014J. In addition, the diffuse 60Fe gamma-ray emission in the Galaxy can constrain nuclear reactions, nucleosynthesis models and final products in SNe. Future possible development of gamma-ray detectors is also discussed.

　　时间：2020年11月4日星期三15:00

　　地点：紫台仙林3-402 教室

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紫金山天文台学术委员会