Electromagnetic Precursors to Gravitational-wave Events: Numerical Simulations of Flaring in Pre-merger Binary Neutron Star Magnetospheres
Electromagnetic Precursors to Gravitational-wave Events: Numerical Simulations of Flaring in Pre-merger Binary Neutron Star Magnetospheres
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DOI：
10.3847/2041-8213/ab8196
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发表时间：
2020-01
期刊：
影响因子：
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通讯作者：
E. Most;A. Philippov
中科院分区：
文献类型：
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作者：
E. Most;A. Philippov
中子星星合并事件中引力波的探测开辟了多信使天文学的新领域，将引力波事件与短伽马射线爆发和千诺瓦余辉联系起来。另一个尚未被发现的电磁对应物是两颗中子星在合并前磁层的非平凡相互作用产生的前兆发射。通过执行特殊的相对论性无力模拟轨道中子星，我们讨论了不同的磁场方向的影响，并显示如何发射可以显着增强差分运动中存在的二进制，无论是由于恒星自旋或错位恒星磁层。我们发现，在连接两颗恒星的磁通量管的扭曲的积累，可以导致重复发射的强大耀斑的各种轨道配置。我们还讨论了耀斑过程中潜在的相干射电辐射机制。
The detection of gravitational waves from neutron star merger events has opened up a new field of multimessenger astronomy linking gravitational-wave events to short gamma-ray bursts and kilonova afterglows. A further—yet to be discovered—electromagnetic counterpart is a precursor emission produced by the nontrivial interaction of the magnetospheres of the two neutron stars prior to merger. By performing special-relativistic force-free simulations of orbiting neutron stars we discuss the effect of different magnetic field orientations and show how the emission can be significantly enhanced by differential motion present in the binary, either due to stellar spins or misaligned stellar magnetospheres. We find that the buildup of twist in the magnetic flux tube connecting the two stars can lead to the repeated emission of powerful flares for a variety of orbital configurations. We also discuss potential coherent radio emission mechanisms in the flaring process.