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arXiv 2108.02554astro-ph.HEastro-ph.SR
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回收垃圾的最大吸积质量

The maximum accreted mass of recycled pulsars

Zhenwei Li, Xuefei Chen, Hai-Liang Chen, Zhanwen Han

摘要:

中子星的最大质量对于约束中子星的物态方程和理解中子星与恒星质量黑洞之间的质量差具有重要意义。X射线双星中的NS会通过吸积来自同伴的物质而增加质量(称为再循环过程),吸积过程中的不确定性给研究NS出生时的质量带来了挑战。{In本文研究了考虑NS自旋演化效应的NS吸积质量,给出了NS在再循环过程中的最大吸积质量。通过探索一系列的二元演化计算,我们得到了NS的最终质量和最大吸积质量,对于给定的NS的出生质量和传质效率。结果表明,对于供体质量在$1.8\sim 2.4M_\odot$范围内的二元系统,NS可以吸积相对较多的物质,当残余WD质量在$\sim 0.25-0.30M_\odot$范围内时,NS吸积相对较多的质量,并且最大吸积质量与NS初始质量正相关。对于出生时质量传递效率为0.3的$1.4M_\odot$ NS,最大吸积质量可能为$0.27M_\odot$。所得结果可用于估计观测值中含有大质量NS的系统的最小出生质量。

英文摘要:

The maximum mass of neutron stars (NSs) is of great importance for constraining equations of state of NSs and understanding the mass gap between NSs and stellar-mass black holes. NSs in X-ray binaries would increase in mass by accreting material from their companions (known as recycling process), and the uncertainties in the accretion process give challenge to study the NS mass at birth. {In this work, we investigate the NS accreted mass with considering the effect of NS spin evolution and give the maximum accreted mass for NSs in the recycling process. By exploring a series of binary evolution calculations, we obtain the final NS mass and the maximum accreted mass for a given birth mass of NS and a mass transfer efficiency. Our results show that the NSs can accrete relatively more material for binary systems with the donor masses in the range of $1.8\sim 2.4M_\odot$, the NSs accrete relatively more mass when the remnant WD mass is in the range of $\sim 0.25-0.30M_\odot$, and the maximum accreted mass is positively correlated with the initial NS mass. For a $1.4M_\odot$ NS at birth with a moderate mass transfer efficiency of 0.3, the maximum accreted mass could be $0.27M_\odot$. The results can be used to estimate the minimum birth mass for systems with massive NSs in observations.

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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