报告题目:伽玛射线暴不同中心引擎释放引力波的对比研究
报告人:刘彤
摘要:黑洞与中子星、双中子星或双黑洞并合事件除了是强引力波源外,还可能伴随一系列电磁辐射,首当其冲的就是伽玛射线暴(GRB)及其多波段辐射。同时,并合之后形成的GRB中心引擎也是强引力波源的候选体。GRB中心引擎的模型主要包括中微子主导吸积流(NDAF)模型、黑洞超吸积下Blandford-Znajek(BZ)机制和毫秒磁星模型。三种主流模型在解释GRB纷繁复杂的观测现象上各有优势,但从这些观测入手并不容易鉴别哪类模型真实存在于GRB中心。为了进一步探索、验证和区分不同的GRB中心能源机制,继提出通过探测MeV中微子的方式辨别后,我们又进一步提出了通过对比中心引擎释放的引力波作为判定的方法。该报告将主要介绍这一工作。
报告题目:A Black Hole - White Dwarf Compact Binary Model for Long Gamma-ray Bursts without Supernova Association
报告人:顾为民
摘要:Gamma-ray bursts (GRBs) are luminous and violent phenomena in the universe. Traditionally, long GRBs are expected to be produced by the collapse of massive stars and associated with supernovae. However, some low-redshift long GRBs have no detection of supernova association, such as GRBs 060505, 060614 and 111005A. It is hard to classify these events convincingly according to usual classifications, and the lack of the supernova implies a non-massive star origin. We propose a new path to produce long GRBs without supernova association, the merger of a stellar-mass black hole and a white dwarf, which fills an important gap in compact binary evolution.
报告时间:12月15日上午9:30和10:30,
报告地点:3号楼302会议室
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紫金山天文台学术委员会