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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.
Source PublicationASTROPHYSICAL JOURNAL
2012-08-20
Volume755Issue:2
DOI10.1088/0004-637X/755/2/91
Contribution Rank第29完成单位
Indexed BySCI
KeywordBinaries: General Gravitational Lensing: Micro
AbstractDespite 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.
Funding OrganizationCreative 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]
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-637X
URL查看原文
WOS IDWOS:000307791400008
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSOLAR-TYPE STARS ; LENS ; PHOTOMETRY ; SYSTEMS ; MULTIPLICITY ; RESOLUTION ; ROTATION ; DISTANCE ; PLANETS ; SEARCH
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5218
Collection恒星物理研究组
Corresponding AuthorShin, IG (reprint author), Chungbuk Natl Univ, Inst Astrophys, Dept Phys, Cheongju 371763, South Korea.
Recommended Citation
GB/T 7714
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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