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MICROLENSING DISCOVERY OF A POPULATION OF VERY TIGHT, VERY LOW MASS BINARY BROWN DWARFS
Choi, JY1; Han, C1,60; Udalski, A2,61; Sumi, T3,62; Gaudi, BS4,60; Gould, A4,60; Bennett, DP5,62; Dominik, M6,63,64,65; Beaulieu, JP7,66; Tsapras, Y8,9,64; Bozza, V10,11,63; Abe, F12; Bond, IA13; Botzler, CS14; Chote, P15; Freeman, M14; Fukui, A16; Furusawa, K12; Itow, Y12; Ling, CH13; Masuda, K12; Matsubara, Y12; Miyake, N12; Muraki, Y12; Ohnishi, K17; Rattenbury, NJ14; Saito, T18; Sullivan, DJ15; Suzuki, K12; Sweatman, WL13; Suzuki, D3; Takino, S12; Tristram, PJ19; Wada, K3; Yock, PCM14; Szymanski, MK2; Kubiak, M2; Pietrzynski, G2,20; Soszynski, I2; Skowron, J4; Kozlowski, S2; Poleski, R2; Ulaczyk, K2; Wyrzykowski, L2,21; Pietrukowicz, P2; Almeida, LA22; DePoy, DL23; Dong, S24; Gorbikov, E25; Jablonski, F22; Henderson, CB4; Hwang, KH1; Janczak, J26; Jung, YK1; Kaspi, S25; Lee, CU27; Malamud, U25; Maoz, D25; McGregor, D4; Munoz, JA28; Park, BG27; Park, H1; Pogge, RW4; Shvartzvald, Y25; Shin, IG1; Yee, JC4; Alsubai, KA29; Browne, P6; Burgdorf, MJ30; Novati, SC31; Dodds, P6; Fang XS(房祥松)32; Finet, F33; Glitrup, M34; Grundahl, F34; Gu SH(顾盛宏)32; Hardis, S35; Harpsoe, K35,36; Hinse, TC27,35; Hornstrup, A37; Hundertmark, M6,38; Jessen-Hansen, J34,39; Jrgensen, UG35,36; Kains, N6,40; Kerins, E41; Liebig, C6,42; Lund, MN34; Lundkvist, M34; Maier, G42; Mancini, L11,43; Mathiasen, M35; Penny, MT4,41; Rahvar, S44,45; Ricci, D33,46; Scarpetta, G10,31; Skottfelt, J35; Snodgrass, C47,48; Southworth, J49; Surdej, J33; Tregloan-Reed, J49; Wambsganss, J42; Wertz, O33; Zimmer, F42; Albrow, MD50; Bachelet, E51; Batista, V4; Brillant, S48; Cassan, A52; Cole, AA53; Coutures, C52; Dieters, S53; Prester, DD54; Donatowicz, J55; Fouque, P51; Greenhill, J53; Kubas, D48,52; Marquette, JB52; Menzies, JW56; Sahu, KC57; Zub, M42; Bramich, DM58; Horne, K6; Steele, IA59; Street, RA8
Source PublicationASTROPHYSICAL JOURNAL
2013-05-10
Volume768Issue:2
DOI10.1088/0004-637X/768/2/129
Contribution Rank第32完成单位
Indexed BySCI
KeywordBinaries: General Gravitational Lensing: Micro
Abstract

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.

Funding ProjectChungbuk 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] ; SPS[JSPS19340058] ; KASI[2012-1-410-02] ; KRCF ; [JSPS22403003] ; [JSPS23340064] ; [268421] ; [JSPS23340044]
Funding OrganizationChungbuk 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]
Language英语
Subject Area天文学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000318228400032
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordGRAVITATIONAL LENS ; EXTRASOLAR PLANETS ; GALACTIC BULGE ; SYSTEMS ; EVENTS ; SEARCH ; STARS
Citation statistics
Cited Times:26[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6794
Collection系外行星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorHan, C
Affiliation1.Department of Physics, Institute for Astrophysics, Chungbuk National University, Cheongju 371-763, Republic of Korea
2.Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
3.Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan
4.Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
5.Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556-5670, USA
6.SUPA, School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
7.Institut dAstrophysique de Paris, UMR7095 CNRS-Université Pierre & Marie Curie, 98 bis boulevard Arago, F-75014 Paris, France
8.Las Cumbres Observatory Global Telescope Network, 6740B Cortona Drive, Goleta, CA 93117, USA
9.School of Physics and Astronomy, Queen Mary University of London, Mile End Road, London E1 4NS, UK
10.INFN, Sezione di Napoli, I-80126 Napoli, Italy
11.Dipartimento di Fisica E.R. Caianiello¡, Università di Salerno, Via Ponte Don Melillo, I-84084 Fisciano (SA), Italy
12.Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
13.Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland 0745, New Zealand
14.Department of Physics, University of Auckland, Private Bag 92-019, Auckland 1001, New Zealand
15.School of Chemical and Physical Sciences, Victoria University, Wellington 6140, New Zealand
16.Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, Asakuchi, Okayama 719-0232, Japan
17.Nagano National College of Technology, Nagano 381-8550, Japan
18.Tokyo Metropolitan College of Aeronautics, Tokyo 116-8523, Japan
19.Mt. John University Observatory, P.O. Box 56, Lake Tekapo 8770, New Zealand
20.Departamento de Astronomia, Universidad de Concepci'on, Casilla 160-C, Concepción, Chile
21.Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
22.Instituto Nacional de Pesquisas Espaciais, São José dos Campos, SP, Brazil
23.Department of Physics, Texas A&M University, College Station, TX 77843, USA
24.Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540, USA
25.School of Physics and Astronomy and Wise Observatory, Tel-Aviv University, Tel-Aviv 69978, Israel
26.Department of Physics, Ohio State University, 191 W. Woodruff, Columbus, OH 43210, US
27.Korea Astronomy and Space Science Institute, Daejeon 305-348, Republic of Korea
28.Departamento de Astronomìa y Astrofìsica, Universidad de Valencia, E-46100 Burjassot, Valencia, Spain
29.Qatar Foundation, P.O. Box 5825, Doha, Qatar
30.HE Space Operations, Flughafenallee 24, D-28199 Bremen, Germany
31.Istituto Internazionale per gli Alti Studi Scientifici (IIASS), I-84019 Vietri Sul Mare (SA), Italy
32.National Astronomical Observatories/Yunnan Observatory, Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
33.Institut dAstrophysique et de Géophysique, Allé du 6 Aohat ut 17, Sart Tilman, Bât. B5c, B-4000 Liége, Belgium
34.Stellar Astrophysics Center (SAC), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Århus C, Denmark
35.Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark
36.Centre for Star and Planet Formation, Geological Museum, ster Voldgade 5, DK-1350 Copenhagen, Denmark
37.Institut for Rumforskning og-teknologi, Danmarks Tekniske Universitet, Juliane Maries Vej 30, DK-2100 København, Denmark
38.Institut für Astrophysik, Georg-August-Universität, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
39.Nordic Optical Telescope, Apartado 474, E-38700 Santa Cruz de La Palma, Spain
40.SO Headquarters, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany
41.Jodrell Bank Centre for Astrophysics, University of Manchester, Oxford Road, Manchester M13 9PL, UK
42.Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstr. 12-14, D-69120 Heidelberg, Germany
43.Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
44.Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran
45.Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, ON N2L2Y5, Canada
46.INAF/Istituto di Astrofisica Spaziale e Fisica Cosmica-Bologna, Via Gobetti 101, I-40129 Bologna, Italy
47.Max Planck Institute for Solar System Research, Max-Planck-Str. 2, D-37191 Katlenburg-Lindau, Germany
48.European Southern Observatory (ESO), Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
49.Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK
50.Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand
51.IRAP, Université de Toulouse, CNRS, 14 Avenue Edouard Belin, F-31400 Toulouse, France
52.UPMC-CNRS, UMR 7095, Institut dAstrophysique de Paris, 98bis boulevard Arago, F-75014 Paris, France
53.School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, TAS 7001, Australia
54.Department of Physics, University of Rijeka, Omladinska 14, 51000 Rijeka, Croatia
55.Department of Computing, Technical University of Vienna, Wiedner Hauptstrasse, A-1040 Vienna, Austria
56.South African Astronomical Observatory, P.O. Box 9, Observatory 7925, South Africa
57.Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
58.European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany
59.Astrophysics Research Institute, Liverpool John Moores University, Liverpool CH41 1LD, UK
60.The μFUN Collaboration.
61.The OGLE Collaboration.
62.The MOA Collaboration.
63.The MiNDSTEp Consortium.
64.The RoboNet Collaboration.
65.Royal Society University Research Fellow.
66.The PLANET Collaboration.
Recommended Citation
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.,...&Street, RA.(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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