Gravitational-wave cutoff frequencies of tidally disruptive neutron star-black hole binary mergers
Gravitational-wave cutoff frequencies of tidally disruptive neutron star-black hole binary mergers
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DOI：
10.1103/physrevd.92.081504
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发表时间：
2015-09
影响因子：
5
通讯作者：
F. Pannarale;E. Berti;K. Kyutoku;B. Lackey;M. Shibata
中科院分区：
文献类型：
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作者：
F. Pannarale;E. Berti;K. Kyutoku;B. Lackey;M. Shibata
潮汐破裂对中子星-黑洞合并的结果有着巨大的影响。这些系统的现象学可以分为三类：非破坏性，轻度破坏性和破坏性。在合并过程中产生的引力辐射的截止频率（这是潜在的测量干涉探测器）是非常不同的，在每一个制度，当合并是破坏性的，它携带信息的中子星星状态方程。在这里，我们使用半分析工具，推导出一个公式的临界二进制质量比Q= MBH/M NS，低于该合并是破坏性的函数的恒星的紧凑性C=M NS /R NS和无量纲黑洞自旋χ。然后，我们采用了一个新的引力波振幅模型，校准到134个广义相对论数值模拟的二进制黑洞自旋（反）与轨道角动量对齐，以获得适合的引力波截止频率在分裂制度作为C，Q和χ的函数。我们的发现对于建立引力波模板库，确定中子星黑洞合并是否可以发射电磁辐射（从而帮助多信使搜索）以及改进这些系统的事件率计算非常重要。
Tidal disruption has a dramatic impact on the outcome of neutron star–black hole mergers. The phenomenology of these systems can be divided in three classes: nondisruptive, mildly disruptive, and disruptive. The cutoff frequency of the gravitational radiation produced during the merger (which is potentially measurable by interferometric detectors) is very different in each regime, and when the merger is disruptive it carries information on the neutron star equation of state. Here we use semianalytical tools to derive a formula for the critical binary mass ratio Q=M BH /M NS below which mergers are disruptive as a function of the stellar compactness C=M NS /R NS and the dimensionless black hole spin χ . We then employ a new gravitational waveform amplitude model, calibrated to 134 general relativistic numerical simulations of binaries with black hole spin (anti-)aligned with the orbital angular momentum, to obtain a fit to the gravitational-wave cutoff frequency in the disruptive regime as a function of C , Q , and χ . Our findings are important to build gravitational-wave template banks, to determine whether neutron star–black hole mergers can emit electromagnetic radiation (thus helping multimessenger searches), and to improve event rate calculations for these systems.