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Merging strangeon stars
Lai, Xiao-Yu1,2; Yu, Yun-Wei3; Zhou, En-Ping4,5; Li, Yun-Yang4; Xu, Ren-Xin4,5
Contribution Rank2

The state of supranuclear matter in compact stars remains puzzling, and it is argued that pulsars could be strangeon stars. What would happen if binary strangeon stars merge? This kind of merger could result in the formation of a hyper-massive strangeon star, accompanied by bursts of gravitational waves and electromagnetic radiation (and even a strangeon kilonova explained in the paper). The tidal polarizability of binary strangeon stars is different from that of binary neutron stars, because a strangeon star is self-bound on the surface by the fundamental strong force while a neutron star by the gravity, and their equations of state are different. Our calculation shows that the tidal polarizability of merging binary strangeon stars is favored by GW170817. Three kinds of kilonovae (i.e., of neutron, quark and strangeon) are discussed, and the light curve of the kilonova AT 2017gfo following GW170817 could be explained by considering the decaying strangeon nuggets and remnant star spin-down. Additionally, the energy ejected to the fireball around the nascent remnant strangeon star, being manifested as a gamma-ray burst, is calculated. It is found that, after a prompt burst, an X-ray plateau could follow in a timescale of 10(2) - 10(3) s. Certainly, the results could be tested also by further observational synergies between gravitational wave detectors (e.g., Advanced LIGO) and X-ray telescopes (e.g., the Chinese HXMT satellite and eXTP mission), and especially if the detected gravitational wave form is checked by peculiar equations of state provided by the numerical relativistical simulation.

KeywordStars: Neutron Pulsars: General X-rays: Stars Gravitational Waves
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS KeywordQuark Matter ; Mergers ; Events
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000428267600012
Funding OrganizationNational Key R&D Program of China(2017YFA0402602) ; West Light Foundation(XBBS-2014-23) ; National Natural Science Foundation of China(11203018, 11673002, U1531243)
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Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorLai, Xiao-Yu
Affiliation1.Hubei Univ Educ, Sch Phys & Mech & Elect Engn, Wuhan 430205, Hubei, Peoples R China
2.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China
3.Cent China Normal Univ, Inst Astrophys, Wuhan 430079, Hubei, Peoples R China
4.Peking Univ, Sch Phys, Beijing 100871, Peoples R China
5.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
First Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Corresponding Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Lai, Xiao-Yu,Yu, Yun-Wei,Zhou, En-Ping,et al. Merging strangeon stars[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(2):24.
APA Lai, Xiao-Yu,Yu, Yun-Wei,Zhou, En-Ping,Li, Yun-Yang,&Xu, Ren-Xin.(2018).Merging strangeon stars.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(2),24.
MLA Lai, Xiao-Yu,et al."Merging strangeon stars".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.2(2018):24.
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