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The spin of the second-born black hole in coalescing binary black holes
Qin, Y.1; Fragos, T.1,2; Meynet, G.1; Andrews, J.3,4; Sorensen, M.1; Song, H. F.1,5,6
Source PublicationASTRONOMY & ASTROPHYSICS
2018-08-10
Volume616
DOI10.1051/0004-6361/201832839
Indexed BySCI ; EI
KeywordBinaries: Close Stars: Black Holes Stars: Evolution Sun: Rotation Gamma-ray Burst: General Stars: Wolf-rayet
Abstract

Context. Various binary black hole formation channels have been proposed since the first gravitational event GW150914 was discovered by the Advanced Laser Interferometer Gravitational-Wave Observatory (AdLIGO). The immediate progenitor of the binary black hole is a close binary system composed of a black hole and a helium star, which can be the outcome of the classical isolated binary evolution through the common envelope, or alternatively of the massive close evolution through chemically homogeneous channel. 

Aims. We study the spin angular momentum evolution of the helium star in order to constrain the spin of the second-born black hole. This work focuses on the common envelope formation channel, however, some of our conclusions are also relevant for the chemically homogeneous evolution channel. 

Methods. We perform detailed stellar structure and binary evolution calculations that take into account, mass-loss, internal differential rotation, and tidal interactions between the helium star and the black hole companion, where we also calculate the strength of the tidal interactions from first principles based on the structure of the helium stars. We systematically explore the parameter space of initial binary properties, including initial black hole and helium star masses, initial rotation of the helium star as well as metallicity. 

Results. We argue that the natal spin of the first-born black hole through the common envelope scenario is negligible (<0.1), and therefore the second-born black hole's spin dominates the measured effective spin,)(ell, from gravitational wave events of double black hole mergers. We find that tides can be only important when orbital periods are shorter than 2 days. Upon core collapse, the helium star produces a black hole (the second-born black hole in the system) with a spin that can span the entire range from zero to maximally spinning. We show that the bimodal distribution of the spin of the second-born black hole obtained in recent papers is mainly due to oversimplifying assumptions. We find an anti-correlation between the merging timescale of the two black holes, T-merger and the effective spin. Finally, we provide new prescriptions for the tidal coefficient E-2 for both H-rich and the He-rich stars. 

Conclusions. To understand the spin of the second-born black hole, careful treatment of both tides and stellar winds is needed. We predict that, with future improvements to AdLIGO's sensitivity, the sample of merging binary black hole systems will show an overdensity of sources with positive but small chi(eff) originating from lower-mass black hole mergers born at low redshift.

Funding ProjectChina Scholarship Council (CSC) ; Swiss National Science Foundation[200020-172505] ; Swiss National Science Foundation[PZ00P2_148123] ; European Unions Horizon 2020 research and innovation program under the Marie Sklodowska-Curie RISE action[691164] ; DNRF (Niels Bohr Professorship Program) ; Carlsberg Foundation ; VILLUM FONDEN[16599] ; European Research Council under the European Union's Seventh Framework Programme/ERC Grant[617001]
Funding OrganizationChina Scholarship Council (CSC) ; Swiss National Science Foundation[200020-172505, PZ00P2_148123] ; European Unions Horizon 2020 research and innovation program under the Marie Sklodowska-Curie RISE action[691164] ; DNRF (Niels Bohr Professorship Program) ; Carlsberg Foundation ; VILLUM FONDEN[16599] ; European Research Council under the European Union's Seventh Framework Programme/ERC Grant[617001]
Language英语
Subject Area天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherEDP SCIENCES S A
Publication Place17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN1432-0746
URL查看原文
WOS IDWOS:000441203300001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordGamma-ray Bursts ; Rotating Massive Stars ; Differential Rotation ; Gravitational-waves ; Tidal-evolution ; Magnetic-fields ; Main-sequence ; Neutron-star ; Stellar ; Progenitors
EI Accession Number20183705803714
EI KeywordsStars
EI Classification Number471.4Seawater, Tides and Waves - 657.2Extraterrestrial Physics and Stellar Phenomena - 802.3Chemical Operations - 804Chemical Products Generally - 921Mathematics - 931.3Atomic and Molecular Physics - 931.5Gravitation, Relativity and String Theory - 941.3Optical Instruments - 941.4Optical Variables Measurements
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/17389
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorQin, Y.
Affiliation1.Geneva Observatory, University of Geneva, 1290 Sauverny, Switzerland
2.DARK, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
3.Foundation for Research and Technology – Hellas, IESL, Voutes, 71110 Heraklion, Greece
4.Physics Department & Institute of Theoretical & Computational Physics, University of Crete, 71003 Heraklion, Crete, Greece
5.College of Physics, Guizhou University, Guiyang City, Guizhou Province, 550025, PR China
6.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, PR China
Recommended Citation
GB/T 7714
Qin, Y.,Fragos, T.,Meynet, G.,et al. The spin of the second-born black hole in coalescing binary black holes[J]. ASTRONOMY & ASTROPHYSICS,2018,616.
APA Qin, Y.,Fragos, T.,Meynet, G.,Andrews, J.,Sorensen, M.,&Song, H. F..(2018).The spin of the second-born black hole in coalescing binary black holes.ASTRONOMY & ASTROPHYSICS,616.
MLA Qin, Y.,et al."The spin of the second-born black hole in coalescing binary black holes".ASTRONOMY & ASTROPHYSICS 616(2018).
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