Merger of Compact Stars in the Two-families Scenario

doi:10.3847/1538-4357/ab2fd0

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	Merger of Compact Stars in the Two-families Scenario
	Pietri,Roberto De 1,2; Drago,Alessandro 3,4; Feo,Alessandra 2,5; Pagliara,Giuseppe 3,4; Pasquali,Michele 1,2; Traversi,Silvia 3,4; Wiktorowicz,Grzegorz 6,7
刊名	The Astrophysical Journal
	2019-08-21
卷号	881 期号:2
关键词	equation of state gravitational waves stars: neutron
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab2fd0
英文摘要	Abstract We analyze the phenomenological implications of the two-families scenario on the merger of compact stars. That scenario is based on the coexistence of both hadronic stars and strange quark stars. After discussing the classification of the possible mergers, we turn to detailed numerical simulations of the merger of two hadronic stars, i.e., “first family” stars in which delta resonances and hyperons are present, and we show results for the threshold mass of such binaries for the mass dynamically ejected and the mass of the disk surrounding the post-merger object. We compare these results with those obtained within the one-family scenario, and we conclude that relevant signatures of the two-families scenario can be suggested, in particular the possibility of a rapid collapse to a black hole for masses even smaller than the ones associated with GW170817; during the first milliseconds, oscillations of the post-merger remnant at frequencies higher than the ones obtained in the one-family scenario; a large value of the mass dynamically ejected; and a small mass of the disk for binaries of low total mass. Finally, based on a population synthesis analysis, we present estimates of the number of mergers for two hadronic stars, a hadronic star–strange quark star, and two strange quark stars. We show that for unequal-mass systems and intermediate values of the total mass, the merger of a hadronic star and a strange quark star is very likely (GW170817 has a possible interpretation into this category of mergers). On the other hand, mergers of two strange quark stars are strongly suppressed.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-881-2-AB2FD0
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/27402]
专题	中国科学院国家天文台
作者单位	1.Parma University, Parco Area delle Scienze 7/A, I-43124 Parma, Italy 2.INFN Gruppo Collegato di Parma, Parco Area delle Scienze 7/A, I-43124 Parma, Italy 3.Dipartimento di Fisica e Scienze della Terra dell’Università di Ferrara, Via Saragat 1, I-44100 Ferrara, Italy 4.INFN Sez.?di Ferrara, Via Saragat 1, I-44100 Ferrara, Italy 5.Department of Chemistry, Life Sciences and Environmental Sustainability, Parma University, Parco Area delle Scienze, 157/A, I-43124 Parma (PR), Italy 6.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China 7.China and School of Astronomy and Space Science, University of the Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
推荐引用方式 GB/T 7714	Pietri,Roberto De,Drago,Alessandro,Feo,Alessandra,et al. Merger of Compact Stars in the Two-families Scenario[J]. The Astrophysical Journal,2019,881(2).
APA	Pietri,Roberto De.,Drago,Alessandro.,Feo,Alessandra.,Pagliara,Giuseppe.,Pasquali,Michele.,...&Wiktorowicz,Grzegorz.(2019).Merger of Compact Stars in the Two-families Scenario.The Astrophysical Journal,881(2).
MLA	Pietri,Roberto De,et al."Merger of Compact Stars in the Two-families Scenario".The Astrophysical Journal 881.2(2019).