The Allowed Parameter Space of a Long-lived Neutron Star as the Merger Remnant of GW170817
Ai,Shunke1; Gao,He1; Dai,Zi-Gao2,3; Wu,Xue-Feng4; Li,Ang5; Zhang,Bing6,7,8; Li,Mu-Zi1
Source PublicationThe Astrophysical Journal
AbstractAbstract Due to the limited sensitivity of the current gravitational wave (GW) detectors, the central remnant of the binary neutron star (NS) merger associated with GW170817 remains an open question. In view of the relatively large total mass, it is generally proposed that the merger of GW170817 would lead to a short-lived hypermassive NS or directly produce a black hole (BH). There is no clear evidence to support or rule out a long-lived NS as the merger remnant. Here, we utilize the GW and electromagnetic (EM) signals to comprehensively investigate the parameter space that allows a long-lived NS to survive as the merger remnant of GW170817. We find that for some stiff equations of state, the merger of GW170817 could, in principle, lead to a massive NS, which has a millisecond spin period. The post-merger GW signal could hardly constrain the ellipticity of the NS. If the ellipticity reaches 10?3, in order to be compatible with the multi-band EM observations, the dipole magnetic field of the NS (Bp) is constrained to the magnetar level of ~1014 G. If the ellipticity is smaller than 10?4, Bp is constrained to the level of ~109–1011 G. These conclusions weakly depend on the adoption of the NS equation of state.
Keywordgamma-ray burst: general gravitational waves
WOS IDIOP:0004-637X-860-1-aac2b7
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Department of Astronomy, Beijing Normal University, Beijing 100875, People's Republic of China;
2.School of Astronomy and Space Science, Nanjing University, Nanjing 210093, People's Republic of China;
3.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, People's Republic of China
4.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China;
5.Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, People's Republic of China;
6.Department of Physics and Astronomy, University of Nevada Las Vegas, Las Vegas, NV 89154, USA;
7.Department of Astronomy, School of Physics, Peking University, Beijing 100871, People's Republic of China
8.Kavli Institute of Astronomy and Astrophysics, Peking University, Beijing 100871, People's Republic of China
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GB/T 7714
Ai,Shunke,Gao,He,Dai,Zi-Gao,et al. The Allowed Parameter Space of a Long-lived Neutron Star as the Merger Remnant of GW170817[J]. The Astrophysical Journal,2018,860(1).
APA Ai,Shunke.,Gao,He.,Dai,Zi-Gao.,Wu,Xue-Feng.,Li,Ang.,...&Li,Mu-Zi.(2018).The Allowed Parameter Space of a Long-lived Neutron Star as the Merger Remnant of GW170817.The Astrophysical Journal,860(1).
MLA Ai,Shunke,et al."The Allowed Parameter Space of a Long-lived Neutron Star as the Merger Remnant of GW170817".The Astrophysical Journal 860.1(2018).
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