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CHARACTERIZING LOW-MASS BINARIES FROM OBSERVATION OF LONG-TIMESCALE CAUSTIC-CROSSING GRAVITATIONAL MICROLENSING EVENTS
Shin, IG; Han, C; Choi, JY; Udalski, A; Sumi, T; Gould, A; Bozza, V; Dominik, M; Fouque, P; Horne, K; Szymanski, MK; Kubiak, M; Soszynski, I; Pietrzynski, G; Poleski, R; Ulaczyk, K; Pietrukowicz, P; Kozllowski, S; Skowron, J; Wyrzykowski, L; Collaboration, O; Abe, F; Bennett, DP; Bond, IA; Botzler, CS; Chote, P; Freeman, M; Fukui, A; Furusawa, K; Itow, Y; Kobara, S; Ling, CH; Masuda, K; Matsubara, Y; Miyake, N; Muraki, Y; Ohmori, K; Ohnishi, K; Rattenbury, NJ; Saito, T; Sullivan, DJ; Suzuki, D; Suzuki, K; Sweatman, WL; Takino, S; Tristram, PJ; Wada, K; Yock, PCM; Bramich, DM; Snodgrass, C; Steele, IA; Street, RA; Tsapras, Y; Alsubai, KA; Browne, P; Burgdorf, MJ; Novati, SC; Dodds, P; Dreizler, S; Fang XS(房祥松); Grundahl, F; Gu SH(顾盛宏); Hardis, S; Harpsoe, K; Hinse, TC; Hornstrup, A; Hundertmark, M; Jessen-Hansen, J; Jorgensen, UG; Kains, N; Kerins, E; Liebig, C; Lund, M; Lunkkvist, M; Mancini, L; Mathiasen, M; Penny, MT; Rahvar, S; Ricci, D; Scarpetta, G; Skottfelt, J; Southworth, J; Surdej, J; Tregloan-Reed, J; Wambsganss, J; Wertz, O; Almeida, LA; Batista, V; Christie, G; Depoy, DL; Dong, S; Gaudi, BS; Henderson, C; Jablonski, F; Lee, CU; McCormick, J; McGregor, D; Moorhouse, D; Natusch, T; Ngan, H; Park, SY; Pogge, RW; Tan, TG; Thornley, G; Yee, JC; Albrow, MD; Bachelet, E; Beaulieu, JP; Brillant, S; Cassan, A; Cole, AA; Corrales, E; Coutures, C; Dieters, S; Prester, DD; Donatowicz, J; Greenhill, J; Kubas, D; Marquette, JB; Menzies, JW; Sahu, KC; Zub, M; Shin, IG (reprint author), Chungbuk Natl Univ, Inst Astrophys, Dept Phys, Cheongju 371763, South Korea.
发表期刊ASTROPHYSICAL JOURNAL
2012-08-20
卷号755期号:2
DOI10.1088/0004-637X/755/2/91
产权排序第29完成单位
收录类别SCI
关键词Binaries: General Gravitational Lensing: Micro
摘要Despite the astrophysical importance of binary star systems, detections are limited to those located in small ranges of separations, distances, and masses and thus it is necessary to use a variety of observational techniques for a complete view of stellar multiplicity across a broad range of physical parameters. In this paper, we report the detections and measurements of two binaries discovered from observations of microlensing events MOA-2011-BLG-090 and OGLE-2011-BLG-0417. Determinations of the binary masses are possible by simultaneously measuring the Einstein radius and the lens parallax. The measured masses of the binary components are 0.43M(circle dot) and 0.39M(circle dot) for MOA-2011-BLG-090 and 0.57M(circle dot) and 0.17M(circle dot) for OGLE-2011-BLG-0417 and thus both lens components of MOA-2011-BLG-090 and one component of OGLE-2011-BLG-0417 are M dwarfs, demonstrating the usefulness of microlensing in detecting binaries composed of low-mass components. From modeling of the light curves considering full Keplerian motion of the lens, we also measure the orbital parameters of the binaries. The blended light of OGLE-2011-BLG-0417 comes very likely from the lens itself, making it possible to check the microlensing orbital solution by follow-up radial-velocity observation. For both events, the caustic-crossing parts of the light curves, which are critical for determining the physical lens parameters, were resolved by high-cadence survey observations and thus it is expected that the number of microlensing binaries with measured physical parameters will increase in the future.
项目资助者Creative Research Initiative Program of National Research Foundation of Korea [2009-0081561] ; European Research Council under the European Community [246678] ; JSPS [JSPS23540339, JSPS19340058] ; German Research Foundation (DFG) ; Communaute francaise de Belgique Actions de recherche concertees-Academie universitaire Wallonie-Europe ; Qatar Foundation through QNRF [NPRP-09-476-1-78] ; European Union [268421] ; Danish Natural Science Foundation (FNU) ; NSF [AST-1103471] ; NASA [NNG04GL51G] ; National Science Foundation Graduate Research Fellowship [2009068160] ; California Institute of Technology (Caltech) ; KRCF Young Scientist Research Fellowship Program ; Korea Astronomy and Space Science Institute (KASI) [2012-1-410-02] ; [JSPS22403003] ; [JSPS23340064] ; [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:000307791400008
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SOLAR-TYPE STARS ; LENS ; PHOTOMETRY ; SYSTEMS ; MULTIPLICITY ; RESOLUTION ; ROTATION ; DISTANCE ; PLANETS ; SEARCH
引用统计
被引频次:22[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5218
专题恒星物理研究组
通讯作者Shin, IG (reprint author), Chungbuk Natl Univ, Inst Astrophys, Dept Phys, Cheongju 371763, South Korea.
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Shin, IG,Han, C,Choi, JY,et al. CHARACTERIZING LOW-MASS BINARIES FROM OBSERVATION OF LONG-TIMESCALE CAUSTIC-CROSSING GRAVITATIONAL MICROLENSING EVENTS[J]. ASTROPHYSICAL JOURNAL,2012,755(2).
APA Shin, IG.,Han, C.,Choi, JY.,Udalski, A.,Sumi, T.,...&Shin, IG .(2012).CHARACTERIZING LOW-MASS BINARIES FROM OBSERVATION OF LONG-TIMESCALE CAUSTIC-CROSSING GRAVITATIONAL MICROLENSING EVENTS.ASTROPHYSICAL JOURNAL,755(2).
MLA Shin, IG,et al."CHARACTERIZING LOW-MASS BINARIES FROM OBSERVATION OF LONG-TIMESCALE CAUSTIC-CROSSING GRAVITATIONAL MICROLENSING EVENTS".ASTROPHYSICAL JOURNAL 755.2(2012).
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