An observationally derived kick distribution for neutron stars in binary systems
An observationally derived kick distribution for neutron stars in binary systems
复制标题
双星系统中中子星的观测推导的冲击分布
DOI：
10.1093/mnras/stad680
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发表时间：
2023
影响因子：
4.8
通讯作者：
Strader, Jay
中科院分区：
文献类型：
--
作者：
O’Doherty, Tyrone N.;Bahramian, Arash;Miller-Jones, James C. A.;Goodwin, Adelle J.;Mandel, Ilya;Willcox, Reinhold;Atri, Pikky;Strader, Jay
了解中子星（NS）在形成过程中接收的纳塔尔踢是模拟大质量双星演化的关键组成部分。纳塔尔踢是一个不可分割的输入参数的人口合成代码，并有影响双NS系统的形成和随后的合并率。然而，所使用的许多标准观测反冲分布是从仅从孤立NS创建的样本中获得的。以这种方式导出的反冲分布高估了固有的NS反冲分布。对于双星中的NS，我们只能直接估计纳塔尔反冲对双星系统的影响，而不能直接估计NS本身所受到的纳塔尔反冲。在这里，我们第一次提出了一个二元踢分布与低质量的同伴的NS。我们编制了一个目录的145个NS在低质量的双星最好的约束自行，距离和系统的径向速度。对于每个二进制，我们使用三维的方法来估计其二进制踢。我们讨论了这些踢系统形成的影响，并提供了一个参数模型的整体二进制踢分布，用于在未来的理论建模工作。我们比较我们的结果与其他工作孤立的NS和NS的二进制文件，发现NS踢分布适合只使用孤立的双头低估了分数的NS，收到低踢。我们讨论了我们的研究结果对双NS系统建模的影响，并就如何在未来的理论工作中使用我们的结果提供了建议。
Understanding the natal kicks received by neutron stars (NSs) during formation is a critical component of modelling the evolution of massive binaries. Natal kicks are an integral input parameter for population synthesis codes, and have implications for the formation of double NS systems and their subsequent merger rates. However, many of the standard observational kick distributions that are used are obtained from samples created only from isolated NSs. Kick distributions derived in this way overestimate the intrinsic NS kick distribution. For NSs in binaries, we can only directly estimate the effect of the natal kick on the binary system, instead of the natal kick received by the NS itself. Here, for the first time, we present a binary kick distribution for NSs with low-mass companions. We compile a catalogue of 145 NSs in low-mass binaries with the best available constraints on proper motion, distance, and systemic radial velocity. For each binary, we use a three-dimensional approach to estimate its binary kick. We discuss the implications of these kicks on system formation, and provide a parametric model for the overall binary kick distribution, for use in future theoretical modelling work. We compare our results with other work on isolated NSs and NSs in binaries, finding that the NS kick distributions fit using only isolated pulsars underestimate the fraction of NSs that receive low kicks. We discuss the implications of our results on modelling double NS systems, and provide suggestions on how to use our results in future theoretical works.