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arXiv 2207.14435astro-ph.HEgr-qc
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中子星并合驱动的快速射电暂现源

Reconnection-powered fast radio transients from coalescing neutron star binaries

Elias R. Most, Alexander A. Philippov

AI总结:

本研究通过全局无力电动力学模拟证明,磁场远低于磁星水平的中子星双星并合可产生毫秒级快速射电暴样暂现源,其机制为磁重联增强导致电流片碎裂成等离子体团并碰撞发射相干辐射。

摘要:

中子星参与的引力波事件是否以及如何伴随电磁对应体,仍是一个悬而未决的问题。本研究证明,两颗磁场强度远低于磁星水平的中子星碰撞,可以产生类似快速射电暴的毫秒级暂现源。通过全局无力电动力学模拟,我们展示了双星磁层中过度扭转的公共磁通管产生的电磁耀发,与轨道电流片碰撞并压缩它,导致磁重联增强。结果,电流片碎裂成一系列等离子体团,它们相互碰撞并发射相干电磁波。产生的毫秒级辐射暴频率范围应为$10-20\\,\rm GHz$,对应恒星表面磁场$B^{\ast}=10^{11}\\,\rm G$。

英文摘要:

It is an open question whether and how gravitational wave events involving neutron stars can be preceded by electromagnetic counterparts. This work shows that the collision of two neutron stars with magnetic fields well below magnetar-level strengths can produce millisecond Fast-Radio-Burst-like transients. Using global force-free electrodynamics simulations, we demonstrate that electromagnetic flares, produced by overtwisted common flux tubes in the binary magnetosphere, collide with the orbital current sheet and compress it, resulting in enhanced magnetic reconnection. As a result, the current sheet fragments into a sequence of plasmoids, which collide with each other leading to the emission of coherent electromagnetic waves. The resulting millisecond-long burst of radiation should have frequencies in the range of $10-20\,\rm GHz$ for magnetic fields of $B^{\ast}=10^{11}\, \rm G$ at the stellar surfaces.

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