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Brightening X-Ray/Optical/Radio Emission of GW170817/SGRB 170817A: Evidence for an Electron–Positron Wind from the Central Engine?
Geng,Jin-Jun1,2,3; Dai,Zi-Gao1,2; Huang,Yong-Feng1,2; Wu,Xue-Feng4; Li,Long-Biao1,2; Li,Bing1,2; Meng,Yan-Zhi4
2018-03-30
Source PublicationThe Astrophysical Journal Letters
ISSN2041-8205
Volume856Issue:2
AbstractAbstract Recent follow-up observations of the binary neutron star (NS) merging event GW170817/SGRB 170817A reveal that its X-ray/optical/radio emissions are brightening continuously up to ~100 days post-merger. This late-time brightening is unexpected from the kilonova model or the off-axis top-hat jet model for gamma-ray burst (SGRB) afterglows. In this Letter, by assuming that the merger remnant is a long-lived NS, we propose that the interaction between an electron–positron-pair (e+e?) wind from the central NS and the jet could produce a long-lived reverse shock, from which a new emission component would rise and can interpret current observations well. The magnetic-field-induced ellipticity of the NS is taken to be 4?×?10?5 in our modeling, so that the braking of the NS is mainly through the gravitational wave (GW) radiation rather than the magnetic dipole radiation, and the emission luminosity at early times would not exceed the observational limits. In our scenario, because the peak time of the brightening is roughly equal to the spin-down timescale of the NS, the accurate peak time may help constrain the ellipticity of the remnant NS. We suggest that radio polarization observations of the brightening would help to distinguish our scenario from other scenarios. Future observations on a large sample of short gamma-ray burst afterglows or detections of GW signals from merger remnants would test our scenario.
Keywordgamma-ray burst: general gravitational waves hydrodynamics radiation mechanisms: non-thermal
DOI10.3847/2041-8213/aab7f9
Language英语
WOS IDIOP:2041-8205-856-2-aab7f9
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23580
Collection中国科学院紫金山天文台
Affiliation1.School of Astronomy and Space Science, Nanjing University, Nanjing 210023, People’s Republic of China gengjinjun@nju.edu.cn, dzg@nju.edu.cn, hyf@nju.edu.cn
2.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210023, People’s Republic of China
3.Department of Physics, Nanjing University, Nanjing 210093, People’s Republic of China
4.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People’s Republic of China; xfwu@pmo.ac.cn
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GB/T 7714
Geng,Jin-Jun,Dai,Zi-Gao,Huang,Yong-Feng,等. Brightening X-Ray/Optical/Radio Emission of GW170817/SGRB 170817A: Evidence for an Electron–Positron Wind from the Central Engine?[J]. The Astrophysical Journal Letters,2018,856(2).
APA Geng,Jin-Jun.,Dai,Zi-Gao.,Huang,Yong-Feng.,Wu,Xue-Feng.,Li,Long-Biao.,...&Meng,Yan-Zhi.(2018).Brightening X-Ray/Optical/Radio Emission of GW170817/SGRB 170817A: Evidence for an Electron–Positron Wind from the Central Engine?.The Astrophysical Journal Letters,856(2).
MLA Geng,Jin-Jun,et al."Brightening X-Ray/Optical/Radio Emission of GW170817/SGRB 170817A: Evidence for an Electron–Positron Wind from the Central Engine?".The Astrophysical Journal Letters 856.2(2018).
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