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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; Bozza, V; Abe, F; Bond, IA; Botzler, CS; Chote, P; Freeman, M; Fukui, A; Furusawa, K; Itow, Y; Ling, CH; Masuda, K; Matsubara, Y; Miyake, N; Muraki, Y; Ohnishi, K; Rattenbury, NJ; Saito, T; Sullivan, DJ; Suzuki, K; Sweatman, WL; Suzuki, D; Takino, S; Tristram, PJ; Wada, K; Yock, PCM; Szymanski, MK; Kubiak, M; Pietrzynski, G; Soszynski, I; Skowron, J; Kozlowski, S; Poleski, R; Ulaczyk, K; Wyrzykowski, L; Pietrukowicz, P; Almeida, LA; DePoy, DL; Dong, S; Gorbikov, E; Jablonski, F; Henderson, CB; Hwang, KH; Janczak, J; Jung, YK; Kaspi, S; Lee, CU; Malamud, U; Maoz, D; McGregor, D; Munoz, JA; Park, BG; Park, H; Pogge, RW; Shvartzvald, Y; Shin, IG; Yee, JC; Alsubai, KA; Browne, P; Burgdorf, MJ; Novati, SC; Dodds, P; Fang XS(房祥松); Finet, F; Glitrup, M; Grundahl, F; Gu SH(顾盛宏); Hardis, S; Harpsoe, K; Hinse, TC; Hornstrup, A; Hundertmark, M; Jessen-Hansen, J; Jrgensen, UG; Kains, N; Kerins, E; Liebig, C; Lund, MN; Lundkvist, M; Maier, G; Mancini, L; Mathiasen, M; Penny, MT; Rahvar, S; Ricci, D; Scarpetta, G; Skottfelt, J; Snodgrass, C; Southworth, J; Surdej, J; Tregloan-Reed, J; Wambsganss, J; Wertz, O; Zimmer, F; Albrow, MD; Bachelet, E; Batista, V; Brillant, S; Cassan, A; Cole, AA; Coutures, C; Dieters, S; Prester, DD; Donatowicz, J; Fouque, P; Greenhill, J; Kubas, D; Marquette, JB; Menzies, JW; Sahu, KC; Zub, M; Bramich, DM; Horne, K; Steele, IA; Street, RA; Han, C (reprint author), Chungbuk Natl Univ, Inst Astrophys, Dept Phys, Cheongju 371763, South Korea.
发表期刊ASTROPHYSICAL JOURNAL
2013-05-10
卷号768期号:2
DOI10.1088/0004-637X/768/2/129
产权排序第32完成单位
收录类别SCI
关键词Binaries: General Gravitational Lensing: Micro
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.
项目资助者Chungbuk National University ; European Research Council under the European Community [246678] ; Danish Natural Science Foundation (FNU) ; German Research Foundation (DFG) ; Communaute francaise de Belgique-Actions de recherche concertees-Academie universitaire Wallonie-Europe ; Qatar National Research Fund (QNRF), Qatar Foundation [NPRP 09-476-1-078] ; Royal Society Leverhulme Trust Senior Research Fellowship ; NSF [AST-1103471] ; NASA [NNX12AB99G] ; National Science Foundation Graduate Research Fellowship [2009068160] ; NASA through the Sagan Fellowship Program ; JSPS [JSPS23540339, JSPS19340058] ; KASI [2012-1-410-02] ; KRCF ; [JSPS22403003] ; [JSPS23340064] ; [268421] ; [JSPS23340044]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000318228400032
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]GRAVITATIONAL LENS ; EXTRASOLAR PLANETS ; GALACTIC BULGE ; SYSTEMS ; EVENTS ; SEARCH ; STARS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6794
专题系外行星研究组
中国科学院天体结构与演化重点实验室
通讯作者Han, C (reprint author), Chungbuk Natl Univ, Inst Astrophys, Dept Phys, Cheongju 371763, South Korea.
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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.,...&Han, C .(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).
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