干旱区生态环境知识资源中心(Arid): Study of the mass-ratio distribution of spectroscopic binaries II. The boundaries of the brown-dwarf desert as seen with the APOGEE spectroscopic binaries

Arid

DOI	10.1093/mnras/stz1517
	Study of the mass-ratio distribution of spectroscopic binaries II. The boundaries of the brown-dwarf desert as seen with the APOGEE spectroscopic binaries
	Shahaf, S.; Mazeh, T.
通讯作者	Shahaf, S.
来源期刊	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN	0035-8711
EISSN	1365-2966
出版年	2019
卷号	487 期号:3 页码:3356-3362
英文摘要	Analysis of APOGEE DR12 stellar radial velocities by Troup et al. affirmed the existence of the well-known brown-dwarf desert (BDD). They detected a dearth of spectroscopic binaries (SB) with periods shorter than 10-30 d and secondaries with masses in the range of 0.010.1 Mo. We reconsider here their sample 01' binaries, focusing on 116 systems on the main sequence of the Gelid colour magnitude diagram, with mostly K-dwarf primaries. Using our recently devised algorithm to analyse the mass-ratio distribution of a sample of Slis we confirm the BM existence and delineate its boundaries. For the K-dwarf APOGEE 1-25 d binaries, the companion-mass range of the BD]) is 0,02-0.2M(:), The mass-ratio distribution of the long-period (25-500 d) binaries does not show any dearth at the q range studied, Instead, their distribution displays a linear increase in log q, implying a tendency towards low-q values. The limits of the liDD do not coincide with the frequently used mass limits of the brown-dwarf population, sometimes defined as 0,013 and 0.08 Me, based on theoretically derived stellar minimum masses for burning deuterium and hydrogen in their cores. Trying to draw the boundaries of the desert, we suggest either a wedged or trapezoidal shape. We discuss briefly different scenarios that can account for the formation of the BDD, in terms of differentiating between stellar secondaries and planets in particular, and compare this desert to the Neptunian desert that can distinguish between Jovian planets and super-Earths of short periods.
英文关键词	methods: data analysis methods: statistical binaries: spectroscopic
类型	Article
语种	英语
国家	Israel
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000478053200031
WOS关键词	EXTRA-SOLAR PLANETS ; STAR-FORMATION ; GIANT PLANETS ; EVOLUTION ; ECCENTRICITY ; COMPANIONS ; ACCRETION ; SEARCH ; I.
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217691
作者单位	Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel
推荐引用方式 GB/T 7714	Shahaf, S.,Mazeh, T.. Study of the mass-ratio distribution of spectroscopic binaries II. The boundaries of the brown-dwarf desert as seen with the APOGEE spectroscopic binaries[J],2019,487(3):3356-3362.
APA	Shahaf, S.,&Mazeh, T..(2019).Study of the mass-ratio distribution of spectroscopic binaries II. The boundaries of the brown-dwarf desert as seen with the APOGEE spectroscopic binaries.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,487(3),3356-3362.
MLA	Shahaf, S.,et al."Study of the mass-ratio distribution of spectroscopic binaries II. The boundaries of the brown-dwarf desert as seen with the APOGEE spectroscopic binaries".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 487.3(2019):3356-3362.