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arXiv 1909.04490astro-ph.HEastro-ph.SRgr-qc
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中子星双星中引力波驱动的潮汐长期不稳定性

Gravitational-wave-driven tidal secular instability in neutron star binaries

Pantelis Pnigouras

摘要:

我们报道了在中子星双星中存在引力波驱动的长期不稳定性,作用于平衡潮汐。这种不稳定性类似于经典的简正模不稳定性,当主星的自旋超过伴星的轨道频率时,这种不稳定性就会活跃。将中子星建模为牛顿n=1的多面体,我们计算了不稳定的时间尺度,在小的轨道间隔下可以低至几秒,但仍然大于螺旋时间尺度。对轨道和自旋演化的影响也进行了简要的探讨,发现不稳定性减缓了内旋,降低了恒星的自旋。

英文摘要:

We report the existence of a gravitational-wave-driven secular instability in neutron star binaries, acting on the equilibrium tide. The instability is similar to the classic Chandrasekhar-Friedman-Schutz (CFS) instability of normal modes and is active when the spin of the primary star exceeds the orbital frequency of the companion. Modeling the neutron star as a Newtonian n=1 polytrope, we calculate the instability time scale, which can be as low as a few seconds at small orbital separations but still larger than the inspiral time scale. The implications for orbital and spin evolution are also briefly explored, where it is found that the instability slows down the inspiral and decreases the stellar spin.

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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