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arXiv 2006.10328astro-ph.HEastro-ph.SR
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什么样的双星系统最有可能产生周期性重复的FRB?

What binary systems are the most likely sources for periodically repeating FRBs?

Xianfei Zhang, He Gao

摘要:

新发现的FRB 180916.J0158+65的周期为16.35天,为理解FRB的来源和发射机制提供了重要线索。许多模型认为周期性重复的FRB可能与至少包含一颗中子星的双星系统(NSC-FRB系统)有关。有人认为,被伴星强风“梳理”的NS可能提供一个解决方案。在“双星梳”模型的基础上,我们利用星族合成方法详细研究了伴星的性质和NSC-FRB系统的性质。我们的主要发现是:2)FRB 180916的16天周期恰好落在最可能周期范围内,这可以解释为什么FRB 180916是第一个被发现的周期性重复FRB,并且我们预计将观察到更多周期在10-30天左右的周期性重复FRB; 3)NSC-FRB系统的出生率足够大,以满足FRB 180916观测所设定的事件率要求,这支持了NSC-FRB可以为产生周期性重复的FRB提供一个重要通道的提议。

英文摘要:

The newly discovered 16.35 days period for repeating FRB 180916.J0158+65 provides an essential clue for understanding the sources and emission mechanism of repeating FRBs. Many models propose that the periodically repeating FRBs might be related to binary star systems that contain at least one neutron star (NSC-FRB system). It has been suggested that the NS "combed" by the strong wind from a companion star might provide a solution. Following the "Binary Comb" model, we use the population synthesis method to study in detail the properties of the companion stars and the nature of NSC-FRB systems. Our main findings are: 1) the companion star is most likely to be a B-type star; 2) the period of 16 days of FRB 180916 happens to fall in the most probable period range, which may explain why FRB 180916 was the first detected periodically repeating FRB, and we expect to observe more periodically repeating FRBs with periods around 10-30 days; 3) the birth rate for NSC-FRB system is large enough to fulfill the event rate requirement set by the observation of FRB 180916, which supports the proposal that NSC-FRB can provide one significant channel for producing periodically repeating FRBs.

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