学术报告第144期：Direct Collision of White Dwarfs as a Possible Major Channel for Type Ia Supernova Explosions

主讲人 (Speaker): 

东苏勃

主讲人单位 (Speaker's Institute): 

北京大学科维理天文与天体物理研究所

邀请人 (Invited by): 

申荣锋

时间 (Time): 

星期四, 2019/10/24 - 10:30 to 11:30

地点 (Location): 

珠海校区海滨红楼17栋107 (Rm 107, Red House 17)

摘要 (Abstract): 

       The explosion mechanism of type Ia supernovae (SN Ia) is unknown. We argue that the direct white dwarf-white dwarf collisions in the field multiple stellar systems is a promising major channel to explain SNe Ia. We show that the collision models reproduce several robust observational features across the SN Ia population. From the archival late-time spectra of some SNe Ia, we discovered the bi-modal velocity distributions of Ni56 in the ejecta, providing direct observational evidence for the collision models. Since March 2016, we have conducted the 100IAS survey to systematically obtain a large and volume-limited complete sample of late-time SN Ia spectra in order to test whether the SN Ia population can be explained by the collision models.

主讲人简介 (Speaker's CV): 

东苏勃: 2004年本科毕业于南京大学天文系；2009年获美国俄亥俄州立大学天文学博士学位；后获首届NASA Carl Sagan Exoplanet Fellowship资助，在美国普林斯顿高等研究院从事博士后研究；2013年起为北京大学科维理天文与天体物理研究所研究员，并入选青年千人项目；2018年入选科技部中青年科技创新领军人才。主要研究方向为系外行星，超新星，微引力透镜和动力学。在ApJ, MNRAS, Science, PNAS, PRL等期刊发表论文120余篇，引用5600余次。。