题目: Tidal disruption events (TDEs): an enigma, a laboratory, and a signpost
报告人: 申荣锋 副教授 中山大学珠海校区
报告时间: 2021年7月5日(周一)上午 10:30
报告地点: 理生楼A513
报告人简介:
申荣锋,中山大学副教授。主要研究爆发性的天文暂现源,例如伽马射线暴,大质量黑洞潮汐瓦解恒星事件,超高光度X射线源,超新星,黑洞吸积盘;致密星等。1999年本科毕业于武汉交通科技大学(现武汉理工大学),2003年硕士毕业于中国科学院高能物理研究所,2010年博士毕业于美国得克萨斯大学奥斯汀分校天文系 。2003至2004年在中科院高能物理所粒子天体物理实验室做客座研究人员,先后在加拿大多伦多大学天文与天体物理系、以色列耶路撒冷希伯来大学做博士后,2015至今为中山大学物理与天文学院副教授。
报告内容简介:
In a tidal disruption event (TDE), the star was torn apart by the tidal force of a massive black hole (BH). The fallback and accretion of the stellar debris toward the BH produce a bright flare. Most of TDEs are detected in the optical/UV band, but a handful events are also detected in X-rays. For the latter sample, the X-rays typically shows up later. I will describe our current understanding of this puzzling feature. Each TDE leads to a formation of a nascent disk. Therefore, it provides a laboratory for testing some physics of accretion disk (e.g., the radiation-pressure instability), and the General Relativity (e.g., the Lense-Thirring effect). Lastly, the disruption of a white dwarf (WD) by an intermediate-mass BH (IMBH) would be a dual-messenger (gravitational and electromagnetic waves) event, and could be a potential tool in hunting for the elusive class of IMBHs.
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