MICROLENSING DISCOVERY OF A POPULATION OF VERY TIGHT, VERY LOW MASS BINARY BROWN DWARFS

	MICROLENSING DISCOVERY OF A POPULATION OF VERY TIGHT, VERY LOW MASS BINARY BROWN DWARFS
	Choi, JY; Han, C; Udalski, A; Sumi, T; Gaudi, BS; Gould, A; Bennett, DP; Dominik, M; Beaulieu, JP; Tsapras, Y
刊名	ASTROPHYSICAL JOURNAL
	2013-05-10
卷号	768 期号:2
关键词	binaries: general gravitational lensing: micro
ISSN号	0004-637X
通讯作者	Han, C (reprint author), Chungbuk Natl Univ, Inst Astrophys, Dept Phys, Cheongju 371763, South Korea.
产权排序	第三十二完成单位
英文摘要	Although many models have been proposed, the physical mechanisms responsible for the formation of low-mass brown dwarfs (BDs) are poorly understood. The multiplicity properties and minimum mass of the BD mass function provide critical empirical diagnostics of these mechanisms. We present the discovery via gravitational microlensing of two very low mass, very tight binary systems. These binaries have directly and precisely measured total system masses of 0.025 M-circle dot and 0.034 M-circle dot, and projected separations of 0.31 AU and 0.19 AU, making them the lowest-mass and tightest field BD binaries known. The discovery of a population of such binaries indicates that BD binaries can robustly form at least down to masses of similar to 0.02 M-circle dot. Future microlensing surveys will measure a mass-selected sample of BD binary systems, which can then be directly compared to similar samples of stellar binaries.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	GRAVITATIONAL LENS ; EXTRASOLAR PLANETS ; GALACTIC BULGE ; SYSTEMS ; EVENTS ; SEARCH ; STARS
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-637X/768/2/129/meta;jsessionid=D8734B27DCE238BEAC56FD2B5D5C546D.c1
语种	英语
WOS记录号	WOS:000318228400032
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6794]
专题	云南天文台_系外行星研究组云南天文台_中国科学院天体结构与演化重点实验室
推荐引用方式 GB/T 7714	Choi, JY,Han, C,Udalski, A,et al. MICROLENSING DISCOVERY OF A POPULATION OF VERY TIGHT, VERY LOW MASS BINARY BROWN DWARFS[J]. ASTROPHYSICAL JOURNAL,2013,768(2).
APA	Choi, JY.,Han, C.,Udalski, A.,Sumi, T.,Gaudi, BS.,...&Gu SH.(2013).MICROLENSING DISCOVERY OF A POPULATION OF VERY TIGHT, VERY LOW MASS BINARY BROWN DWARFS.ASTROPHYSICAL JOURNAL,768(2).
MLA	Choi, JY,et al."MICROLENSING DISCOVERY OF A POPULATION OF VERY TIGHT, VERY LOW MASS BINARY BROWN DWARFS".ASTROPHYSICAL JOURNAL 768.2(2013).