Multimessenger Signals from Black Hole–Neutron Star Mergers without Significant Tidal Disruption
Multimessenger Signals from Black Hole–Neutron Star Mergers without Significant Tidal Disruption
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DOI：
10.3847/2041-8213/abf566
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发表时间：
2021-01
期刊：
影响因子：
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通讯作者：
W. East;L. Lehner;S. Liebling;C. Palenzuela
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文献类型：
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作者：
W. East;L. Lehner;S. Liebling;C. Palenzuela
利用与完全广义相对论相耦合的阻性磁流体动力学模拟，研究了黑洞与磁化中子星合并产生的多信使信号。我们集中在一个质量比为5：1的情况下，合并后只有一小部分中子星物质保留，但我们仍然发现，中子星的磁层与黑洞的相互作用可以提供巨大的电磁辐射。在合并的过程中，磁力线的强烈扭曲导致等离子体发射，并导致光度超过预期的单极感应。我们发现，在合并后不久，最强的发射出现在磁环形成并逃离中心区的过渡时期。剩余磁场在消散之前围绕残存黑洞的自旋轴进行准直，这表明在更有利的情况下(较高的黑洞自转/较低的质量比)，具有较大的吸积盘，将形成喷流。
We study the multimessenger signals from the merger of a black hole with a magnetized neutron star using resistive magnetohydrodynamics simulations coupled to full general relativity. We focus on a case with a 5:1 mass ratio, where only a small amount of the neutron star matter remains post-merger, but we nevertheless find that significant electromagnetic radiation can be powered by the interaction of the neutron star’s magnetosphere with the black hole. In the lead-up to merger, strong twisting of magnetic field lines from the inspiral leads to plasmoid emission and results in a luminosity in excess of that expected from unipolar induction. We find that the strongest emission occurs shortly after merger during a transitory period in which magnetic loops form and escape the central region. The remaining magnetic field collimates around the spin axis of the remnant black hole before dissipating, an indication that, in more favorable scenarios (higher black hole spin/lower mass ratio) with larger accretion disks, a jet would form.