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arXiv 2101.07313astro-ph.HEastro-ph.GA
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黑洞-中子星并合中中子星半径的限制

Constraining neutron star radii in black hole-neutron star mergers from their electromagnetic counterparts

Giacomo Fragione, Abraham Loeb

摘要:

黑洞(BH)和中子星(NS)双星的合并是令人感兴趣的,因为引力波(GW)的发射可以被电磁(EM)对应物所跟随,这可以为短的伽马射线暴提供动力。到目前为止,LIGO/Virgo只观察到一个候选的BH-NS事件,GW190426\_152155,它没有被任何EM对应事件跟随。我们讨论了如何存在(不存在)的残余磁盘,这权力的EM对应,可以与自旋测量LIGO/室女座一起使用,推导出NS的半径的下限(上限)。对于GW190426\_152155的情况,自旋和质量比上的大测量误差阻止对NS半径设置上限。当BH自旋的对齐分量(相对于轨道角动量)最大时,我们提出的方法效果最好,并且可以用于补充可以从GW信号中提取的信息,以获得关于NS状态方程的有价值的信息。

英文摘要:

Mergers of black hole (BH) and neutron star (NS) binaries are of interest since the emission of gravitational waves (GWs) can be followed by an electromagnetic (EM) counterpart, which could power short gamma-ray bursts. Until now, LIGO/Virgo has only observed a candidate BH-NS event, GW190426\_152155, which was not followed by any EM counterpart. We discuss how the presence (absence) of a remnant disk, which powers the EM counterpart, can be used along with spin measurements by LIGO/Virgo to derive a lower (upper) limit on the radius of the NS. For the case of GW190426\_152155, large measurement errors on the spin and mass ratio prevent from placing an upper limit on the NS radius. Our proposed method works best when the aligned component of the BH spin (with respect to the orbital angular momentum) is the largest, and can be used to complement the information that can be extracted from the GW signal to derive valuable information on the NS equation of state.

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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