Pre-merger Electromagnetic Counterparts of Binary Compact Stars

被引：43

作者：

Wang, Jie-Shuang ^{[1
,2
]}

Peng, Fang-Kun ^{[3
,4
]}

Wu, Kinwah ^{[5
]}

Dai, Zi-Gao ^{[1
,6
]}

机构：

[1] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China

[2] Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 200240, Peoples R China

[3] Guizhou Normal Univ, Guizhou Prov Key Lab Radio Astron & Data Proc, Guiyang 550001, Guizhou, Peoples R China

[4] Guizhou Normal Univ, Sch Phys & Elect Sci, Guiyang 550001, Guizhou, Peoples R China

[5] Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

[6] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2018年 / 868卷 / 01期

基金：

中国国家自然科学基金;

关键词：

binaries: close; gravitational waves; stars: magnetic field; stars: neutron; white dwarfs; MAGNETIZED NEUTRON-STAR; GAMMA-RAY BURSTS; GRAVITATIONAL-WAVES; TEMPERATURE DISTRIBUTION; RADIO EMISSIONS; PRECURSORS; SIGNATURES; ELECTRON; PLANETS; SHOWERS;

D O I：

10.3847/1538-4357/aae531

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate emission signatures of binary compact star gravitational wave (GW) sources consisting of strongly magnetized neutron stars (NSs) and/or white dwarfs (WDs) in their late-time inspiral phase. Because of electromagnetic interactions between the magnetospheres of the two compact stars, a substantial amount of energy will be extracted, and the resultant power is expected to be similar to 10(38) - 10(44) erg s(-1) in the last few seconds before the two stars merge, when the binary system contains a NS with a surface magnetic field 10(12) G. The induced electric field in the process can accelerate charged particles up to the EeV energy range. Synchrotron radiation is emitted from energetic electrons, with radiative energies reaching the GeV energy for binary NSs and the MeV energy for NS-WD or double WD binaries. In addition, a blackbody component is also presented, and it peaks at several to hundreds keV for binary NSs and at several keV for NS-WD or double WD binaries. The strong angular dependence of the synchrotron radiation and the isotropic nature of the blackbody radiation lead to distinguishable modulation patterns between the two emission components. If coherent curvature radiation is presented, fast radio bursts could be produced. These components provide unique simultaneous electromagnetic signatures as precursors of GW events associated with magnetized compact star mergers and short gamma-ray bursts (e. g., GRB 100717).

引用

页数：9

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