The evolution of accretion disks in tidal disruption events

报告摘要

Modern picture of black hole accretion comprises a few separate accretion regimes (states), notably the canonical Shakura-Sunyaev thin disk and the `slim’ disk, which correspond to quite different mass feeding rates. Our past understanding of these states draws on different types of objects with drastically different mass scales, and each object may fall in one regime or the other. In a typical tidal disruption event (TDE), the fresh stellar debris mass feeding rate decays monotonically from being ~ >100x super-Eddington to sub-Eddington within one year or so, causing the nascent compact (~ 50 R_g) disk to completely transition from the `slim’ disk state to the thin disk state. Therefore, TDEs provide a rare chance and an unique venue to study the connection between separate accretion states. After describing the basic physical picture of TDEs, I will present our modelling of the disk evolution which enables us to predict the time of the state transition. The observational signature of the transition is identified in Swift J1644+57 and a few more jetted TDE candidates.

报告人

申荣峰 (中山大学)

报告人介绍

申荣峰,湖北襄阳人。中山大学物理与天文学院副教授(2015-),博士生导师。武汉交通科技大学(现武汉理工大学)学士,中科院高能物理物理所硕士。博士毕业于美国德克萨斯大学奥斯汀分校天文系(2010)。先后在加拿大多伦多大学天文与天体物理系(2010-2013)、以色列耶路撒冷希伯来大学(2013-2015)做博士后。研究方向为和黑洞相关的爆发性天文暂现源:伽马射线暴、TDE、超亮X射线源。

地点

物理学院新楼4楼阳光房会议室

时间

2018年10月12日下午4点

邀请人

游贝