Enhanced black hole mergers in binary-binary interactions

doi:10.1093/mnras/sty3432

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	Enhanced black hole mergers in binary-binary interactions
	Liu, Bin 1,2; Lai, Dong 1,2,3
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2019-03-01
卷号	483 期号:3 页码:4060-4069
关键词	black hole physics gravitational waves binaries: general stars: kinematics and dynamics
ISSN号	0035-8711
DOI	10.1093/mnras/sty3432
英文摘要	We study the orbital evolution of black hole (BH) binaries in quadruple systems, where the tertiary binary excites large eccentricity in the BH binary through Lidov-Kozai (LK) oscillations, causing the binary BHs to merge via gravitational radiation. For typical BH binaries with masses m(1,2) similar or equal to 20-30M(circle dot) and initial semimajor axis a(0) similar to 100 au (such that the binaries have no chance of merging by themselves within similar to 10(10) yr), we show that binary-binary interactions can significantly increase the LK window for mergers (the range of companion inclinations that allows the BH binary to merge within 10 Gyr). This increase arises from a secular resonance between the LK oscillation of the BH binary and the nodal precession of the outer (binary-binary) orbit driven by the tertiary binary. Therefore, in the presence of tertiary binary, the BH merger fraction is increased to 10-30 per cent, an order of magnitude larger than the merger fraction found in similar triple systems. Our analysis (with appropriate scalings) can be easily adapted to other configurations of systems, such as relatively compact BH binaries and moderately hierarchical triples, which may generate even higher merger fractions. Since the occurrence rate of stellar quadruples in the galactic fields is not much smaller than that of stellar triples, our result suggests that dynamically induced BH mergers in quadruple systems may be an important channel of producing BH mergers observed by LIGO/VIRGO.
资助项目	NSF[AST-1715246] ; NASA[NNX14AP31G] ; NSFC[11703068] ; NSFC[11661161012]
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000462280000082
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/31869]
专题	中国科学院上海天文台
通讯作者	Liu, Bin
作者单位	1.Cornell Univ, Cornell Ctr Astrophys & Planetary Sci, Ithaca, NY 14853 USA 2.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 3.Tsung Dao Lee Inst, Shanghai 200240, Peoples R China
推荐引用方式 GB/T 7714	Liu, Bin,Lai, Dong. Enhanced black hole mergers in binary-binary interactions[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,483(3):4060-4069.
APA	Liu, Bin,&Lai, Dong.(2019).Enhanced black hole mergers in binary-binary interactions.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,483(3),4060-4069.
MLA	Liu, Bin,et al."Enhanced black hole mergers in binary-binary interactions".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 483.3(2019):4060-4069.