Colloquium on Jun. 21th, 2018: Double tidal disruption events with massive black hole binaries

Speaker: 袁业飞（中国科学技术大学）/ Yefei Yuan (USTC)

Venue: Gewu 4410

Time: 3:00 PM, Thursday, 21th June, 2018

Abstract:

The evolution of main-sequence binaries resided in the galactic centre is influenced a lot by the central supermassive black hole (SMBH). Due to this perturbation, the stars in a dense environment are likely to experience mergers or collisions through secular or non-secular interactions.

In this talk, I will discuss our recent study on the dynamics of the stellar binaries at galactic centre, perturbed by another distant SMBH. It is found that the event rate of the stellar tidal disruptions for a close SMBH binary is enhanced significantly than the one without the external SMBH.

We also discuss the event rate of double tidal disruption events (DTDEs) that two stars in binary are tidally disrupted in sequence by either supermassive black hole, and the time interval between two successive tidal disruption events. We suggest that DTDEs with large time interval (>150 days) could be a useful tool to find SMBHB candidates at galactic centers.

Personal Information:

袁业飞，教授，中国科学技术大学物理学院天文学系。1999年中国科学技术大学天体物理中心研究生毕业，获博士学位，并留校任教。2005年12月晋升为教授，并入选教育部“新世纪优秀人才支持计划”。曾任天文学系执行主任。2017年获国家杰出青年科学基金项目资助。主要从事相对论天体物理领域的教学和科研工作。曾应邀访问美国哈佛大学、康奈尔大学、加州大学欧文分校、香港大学物理系，并开展合作研究。目前担任中国天文学会空间天文和高能天体物理专业委员会主任、教育部高等学校天文学专业教学指导委员会委员。