Analytic properties of the electromagnetic field of binary compact stars and electromagnetic precursors to gravitational waves

被引：13
作者：
Wada, Tomoki [1 ]
Shibata, Masaru [1 ,2 ]
Ioka, Kunihito [1 ]
机构：
[1] Kyoto Univ, Ctr Gravitat Phys, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan
[2] Max Planck Inst Gravitat Phys, Albert Einstein Inst, Muhlenberg 1, D-14476 Potsdam, Germany
来源：
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS | 2020年 / 2020卷 / 10期
基金：
日本学术振兴会;
关键词：
HUBBLE CONSTANT; RADIO-BURST; GAMMA-RAYS; ELECTRODYNAMICS; SIGNATURES;
D O I：
10.1093/ptep/ptaa126
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We analytically study the properties of the electromagnetic field in the vacuum around close binary compact stars containing at least one neutron star. We show that the orbital motion of the neutron star induces high multipole modes of the electromagnetic field just before the merger. These modes are superimposed to form a spiral arm configuration, and its edge is found to be a likely site for magnetic reconnection. These modes also enhance the total Poynting flux from neutron star binaries by a factor of 2-4. We also indicate that the electric field induced by the orbital motion leads to a magnetosphere around binaries and estimate its plasma density, which has a different parameter dependence than the Goldreich-Julian density. With these properties, we discuss possible electromagnetic counterparts to gravitationalwave events, and identify radio precursors, such as fast radio bursts, as the most promising observational targets.
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页数：24
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