干旱区生态环境知识资源中心(Arid): Formation of close binaries by disc fragmentation and migration, and its statistical modelling

Arid

DOI	10.1093/mnras/stz3299
	Formation of close binaries by disc fragmentation and migration, and its statistical modelling
	Tokovinin, Andrei 1; Moe, Maxwell 2
通讯作者	Tokovinin, Andrei ; Moe, Maxwell
来源期刊	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN	0035-8711
EISSN	1365-2966
出版年	2020
卷号	491 期号:4 页码:5158-5171
英文摘要	Joint statistics of periods and mass ratios of close binaries and its dependence on primary mass can be explained by assuming that seed binary companions are formed by disc fragmentation at random intervals during assemblage of stellar mass and migrate inwards as they accrete from the circumbinary disc. A toy model based on simple prescriptions for the companion growth and migration reproduces such aspects of close solar-mass binaries as the distribution of binary periods P, the brown dwarf desert at short P, the nearly uniform distribution of mass ratios, and a population of equal-mass binaries (twins) that decreases linearly in frequency with log P. For massive stars, the model predicts a large fraction of early mergers, a distribution of log P with a negative slope, and a mass-ratio distribution that is also uniform but with a substantially reduced twin fraction. By treating disc fragmentation as a stochastic process, we also reproduce the observed properties of compact triples. Success of our toy model suggests that most close binaries and compact triples indeed formed by disc fragmentation followed by accretion-driven inward migration.
英文关键词	binaries: close binaries: general binaries: spectroscopic stars: formation
类型	Article
语种	英语
国家	Chile ; USA
开放获取类型	Green Submitted, Bronze, Green Published
收录类别	SCI-E
WOS记录号	WOS:000512310600042
WOS关键词	BLACK-HOLE BINARIES ; SELF-GRAVITATING DISCS ; BROWN DWARF DESERT ; STAR-FORMATION ; MASSIVE STARS ; MISALIGNED ACCRETION ; GLOBULAR-CLUSTERS ; STELLAR-SYSTEMS ; GAS TEMPERATURE ; EVOLUTION
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
来源机构	University of Arizona
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315194
作者单位	1.Cerro Tololo Interamer Observ, Casilla 603, La Serena, Chile; 2.Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA
推荐引用方式 GB/T 7714	Tokovinin, Andrei,Moe, Maxwell. Formation of close binaries by disc fragmentation and migration, and its statistical modelling[J]. University of Arizona,2020,491(4):5158-5171.
APA	Tokovinin, Andrei,&Moe, Maxwell.(2020).Formation of close binaries by disc fragmentation and migration, and its statistical modelling.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,491(4),5158-5171.
MLA	Tokovinin, Andrei,et al."Formation of close binaries by disc fragmentation and migration, and its statistical modelling".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 491.4(2020):5158-5171.