伽玛射线暴和潮汐瓦解事件的中心引擎类比研究

伽玛射线暴中心引擎的物理机制仍然是个谜，普遍认为它与双中子星合并、中子星-黑洞合并或大质量恒星塌缩有关，黑洞吸积盘成为可能的中心引擎模型。Swift和Fermi的观测对中心引擎提出了新的限制，比如中心引擎活动时标更长、喷流可能是磁主导的，这就要求我们对黑洞吸积和喷流产生过程进行更深入的研究。最近，Swift卫星探测到一超大质量黑洞潮汐瓦解恒星事件的候选体Sw J1644+57，该类事件正好成为研究黑洞吸积和喷流产生物理的实验室。本项目将二者结合起来研究，内容包括：伽玛暴与潮汐瓦解事件中心引擎物理过程的研究与类比；从伽玛暴样本中寻找隐藏的潮汐瓦解事件；伽玛暴和潮汐瓦解事件中的多信使信号的研究。这些研究有助于我们理解伽玛暴的起源以及中心引擎的物理机制。

The nature of the central engine of gamma-ray bursts (GRBs) has been one of the main puzzles of astrophysics, which is widely believed to be related to the merger of two neutron stars, the merger of neutron star and black hole, or the collapse of a supermassive star. All of these scenarios involve a system of black hole accretion disk. The observations of Swift and Fermi challenge the understanding of GRB central engine: the activity of the accretion process may be much longer; the jet may be launched magnetically. Recently, the X-ray transient source Sw J1644+57 discovered by Swift is believed to be a tidal disruption event candidate (TDE, tidal disruption of a star by a supermassive black hole), which also involves black hole accretion and jet production. In this project, we intend to: do a comparative study of the central engines in GRBs and TDEs; find the hiding TDEs in GRB samples; study the multi-messenger signal from GRBs and TDEs. These studies may be helpful for understanding the physics of the GRB central engine.