双中子星的极踢和自旋周期-偏心率关系
Polar kicks and the spin period - eccentricity relation in double neutron stars
摘要：
我们目前的人口合成研究的结果，旨在检查自旋踢对齐的作用，在生产的第一个出生的中子星的自旋周期和观测到的双中子星双星在银河系盘的轨道偏心率之间的相关性。我们发现自旋踢对齐与所观察到的相关性是兼容的，但不能减轻在以前的人口合成研究中提出的低踢速度的要求。我们的研究结果进一步表明，低和高偏心率系统可能会形成通过两个不同的形成通道区分的存在或不存在的稳定的质量转移阶段之前，形成的第二个中子星。在观测到的双中子星样本中存在的高偏心系统可能进一步支持这样的观点，即中子星在穿过巨大伴星的包层时会吸积物质。
英文摘要：
We present results of a population synthesis study aimed at examining the role of spin-kick alignment in producing a correlation between the spin period of the first-born neutron star and the orbital eccentricity of observed double neutron star binaries in the Galactic disk. We find spin-kick alignment to be compatible with the observed correlation, but not to alleviate the requirements for low kick velocities suggested in previous population synthesis studies. Our results furthermore suggest low- and high-eccentricity systems may form through two distinct formation channels distinguished by the presence or absence of a stable mass transfer phase before the formation of the second neutron star. The presence of highly eccentric systems in the observed sample of double neutron stars may furthermore support the notion that neutron stars accrete matter when moving through the envelope of a giant companion.
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