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arXiv 1509.00512gr-qcastro-ph.HE
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排列自旋中子星-黑洞合并:引力波振幅模型

Aligned spin neutron star-black hole mergers: a gravitational waveform amplitude model

Francesco Pannarale, Emanuele Berti, Koutarou Kyutoku, Benjamin D. Lackey, Masaru Shibata

摘要:

黑洞与中子星并合时发出的引力辐射与两个黑洞在中子星未被潮汐扰动时的辐射非常相似。当潮汐破裂发生时,重力波形可以大致分为两组,这取决于破裂物质的空间范围。扩展我们中的一些人以前的工作,在这里,我们提出了一个唯象模型的引力波振幅在频域中包含三种可能的结果合并:没有潮汐中断,“温和”和“强”潮汐中断。该模型被校准到134个广义相对论数值模拟的二进制的黑洞自旋是对齐或反对齐的轨道角动量。所有的模拟使用SACRA代码和分段多方中子星状态方程。本模型可用于确定黑洞的二元波形是足够的引力波探测,提取信息的状态方程从未来的引力波观测,以获得更准确的估计黑洞-中子星合并事件率,并确定这些系统的条件下,这些系统是可信的候选人作为中央引擎的伽马射线暴,macronovae和kilonovae。

英文摘要:

The gravitational radiation emitted during the merger of a black hole with a neutron star is rather similar to the radiation from the merger of two black holes when the neutron star is not tidally disrupted. When tidal disruption occurs, gravitational waveforms can be broadly classified in two groups, depending on the spatial extent of the disrupted material. Extending previous work by some of us, here we present a phenomenological model for the gravitational waveform amplitude in the frequency domain encompassing the three possible outcomes of the merger: no tidal disruption, "mild" and "strong" tidal disruption. The model is calibrated to 134 general-relativistic numerical simulations of binaries where the black hole spin is either aligned or antialigned with the orbital angular momentum. All simulations were produced using the SACRA code and piecewise polytropic neutron star equations of state. The present model can be used to determine when black-hole binary waveforms are sufficient for gravitational-wave detection, to extract information on the equation of state from future gravitational-wave observations, to obtain more accurate estimates of black hole-neutron star merger event rates, and to determine the conditions under which these systems are plausible candidates as central engines of gamma-ray bursts, macronovae and kilonovae.

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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