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arXiv 2205.09643astro-ph.HEgr-qc
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中子星双星旋涡晚期的电磁前兆耀斑

Electromagnetic precursor flares from the late inspiral of neutron star binaries

Elias R. Most, Alexander A. Philippov

摘要:

两颗中子星的合并伴随着引力波的发射,也可以具有由质量喷出物提供动力的电磁对应物,以及合并后形成的相对论性喷流。由于中子星可以具有强磁场,因此中子星磁层之间的非平凡相互作用可能会在合并之前引发潜在的强大电磁瞬变。为这些前兆瞬变提供动力的一个关键过程是在两颗恒星之间形成的强电流片中的相对论重联。在这项工作中,我们提供了一个详细的分析如何扭曲的共同磁层的二进制导致电磁耀斑的发射,类似于在太阳日冕中产生的。通过相对论性无力电动力学模拟,我们澄清了不同的磁场拓扑结构在这个过程中的作用。我们的结论是,耀斑总是会发生适当的磁场的路线,除非其中一个中子星有一个磁场明显弱于其他。

英文摘要:

The coalescence of two neutron stars is accompanied by the emission of gravitational waves, and can also feature electromagnetic counterparts powered by mass ejecta and the formation of a relativistic jet after the merger. Since neutron stars can feature strong magnetic fields, the non-trivial interaction of the neutron star magnetospheres might fuel potentially powerful electromagnetic transients prior to merger. A key process powering those precursor transients is relativistic reconnection in strong current sheets formed between the two stars. In this work, we provide a detailed analysis of how the twisting of the common magnetosphere of the binary leads to an emission of electromagnetic flares, akin to those produced in the solar corona. By means of relativistic force-free electrodynamics simulations, we clarify the role of different magnetic field topologies in the process. We conclude that flaring will always occur for suitable magnetic field alignments, unless one of the neutron stars has a magnetic field significantly weaker than the other.

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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