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arXiv 1006.4584astro-ph.HE
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中子星质量双峰分布的进一步证据

Further Evidence for the Bimodal Distribution of Neutron Star Masses

Josiah Schwab, Philipp Podsiadlowski, Saul Rappaport

摘要:

我们使用14个测量良好的中子星质量的集合来加强这些中子星的相当大一部分是通过电子捕获超新星(SNe)而不是铁核塌缩SNe形成的情况。电子俘获中子星的特征是较低的合成引力质量和较小的出生反冲,导致较低的轨道偏心率时,电子俘获中子星导致形成的第二个中子星的双星系统。基于测量的质量和偏心率,我们确定了四个中子星,这有一个平均的后坍缩引力质量约1.25太阳质量,作为产品的电子捕获SNe。我们将剩下的10颗平均质量为1.35太阳质量的中子星与铁核坍缩SNe相关联。如果电子俘获超新星发生在第一颗中子星的形成过程中,那么这将大大增加双中子星的形成概率,因为更多的系统将保持与较小的反冲相结合。然而,这似乎不是任何观察到的系统的情况下,我们讨论了可能的原因。

英文摘要:

We use a collection of 14 well-measured neutron star masses to strengthen the case that a substantial fraction of these neutron stars was formed via electron-capture supernovae (SNe) as opposed to Fe-core collapse SNe. The e-capture SNe are characterized by lower resultant gravitational masses and smaller natal kicks, leading to lower orbital eccentricities when the e-capture SN has led to the formation of the second neutron star in a binary system. Based on the measured masses and eccentricities, we identify four neutron stars, which have a mean post-collapse gravitational mass of ~1.25 solar masses, as the product of e-capture SNe. We associate the remaining ten neutron stars, which have a mean mass of 1.35 solar masses, with Fe-core collapse SNe. If the e-capture supernova occurs during the formation of the first neutron star, then this should substantially increase the formation probability for double neutron stars, given that more systems will remain bound with the smaller kicks. However, this does not appear to be the case for any of the observed systems, and we discuss possible reasons for this.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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