MICROLENSING BINARIES WITH CANDIDATE BROWN DWARF COMPANIONS

	MICROLENSING BINARIES WITH CANDIDATE BROWN DWARF COMPANIONS
	Shin, IG; Han, C; Gould, A; Udalski, A; Sumi, T; Dominik, M; Beaulieu, JP; Tsapras, Y; Bozza, V; Szymanski, MK
刊名	ASTROPHYSICAL JOURNAL
	2012-12-01
卷号	760 期号:2
关键词	binaries: general brown dwarfs gravitational lensing: micro
ISSN号	0004-637X
通讯作者	Han, C (reprint author), Chungbuk Natl Univ, Inst Astrophys, Dept Phys, Chonju 371763, South Korea.
产权排序	第四十五完成单位
英文摘要	Brown dwarfs are important objects because they may provide a missing link between stars and planets, two populations that have dramatically different formation histories. In this paper, we present the candidate binaries with brown dwarf companions that are found by analyzing binary microlensing events discovered during the 2004-2011 observation seasons. Based on the low mass ratio criterion of q < 0.2, we found seven candidate events: OGLE-2004-BLG-035, OGLE-2004-BLG-039, OGLE-2007-BLG-006, OGLE-2007-BLG-399/MOA-2007-BLG-334, MOA-2011-BLG-104/OGLE-2011-BLG-0172, MOA-2011-BLG-149, and MOA-201-BLG-278/OGLE-2011-BLG-012N. Among them, we are able to confirm that the companions of the lenses of MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149 are brown dwarfs by determining the mass of the lens based on the simultaneous measurement of the Einstein radius and the lens parallax. The measured masses of the brown dwarf companions are 0.02 +/- 0.01 M-circle dot and 0.019 +/- 0.002 M-circle dot for MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149, respectively, and both companions are orbiting low-mass M dwarf host stars. More microlensing brown dwarfs are expected to be detected as the number of lensing events with well-covered light curves increases with new-generation searches.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	DIFFERENCE IMAGE-ANALYSIS ; III EWS DATABASE ; GALACTIC BULGE ; GRAVITATIONAL LENS ; OPTICAL DEPTH ; LIGHT CURVES ; STARS ; DISCOVERY ; PLANETS ; SEARCH
收录类别	SCI
原文出处	http://iopscience.iop.org/0004-637X/760/2/116/
语种	英语
WOS记录号	WOS:000311217000020
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5214]
专题	云南天文台_恒星物理研究组
推荐引用方式 GB/T 7714	Shin, IG,Han, C,Gould, A,et al. MICROLENSING BINARIES WITH CANDIDATE BROWN DWARF COMPANIONS[J]. ASTROPHYSICAL JOURNAL,2012,760(2).
APA	Shin, IG.,Han, C.,Gould, A.,Udalski, A.,Sumi, T.,...&Zub, M.(2012).MICROLENSING BINARIES WITH CANDIDATE BROWN DWARF COMPANIONS.ASTROPHYSICAL JOURNAL,760(2).
MLA	Shin, IG,et al."MICROLENSING BINARIES WITH CANDIDATE BROWN DWARF COMPANIONS".ASTROPHYSICAL JOURNAL 760.2(2012).