Characterizing low-mass binaries from observation of long-timescale caustic-crossing gravitational microlensing events

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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DOI

  • Author: Shin, I.-G

    Department of Physics, Chungbuk National University, Korea, Republic of

  • Author: Han, C.

    Department of Physics, Chungbuk National University, Korea, Republic of

  • Author: Choi, J.-Y

    Department of Physics, Chungbuk National University, Korea, Republic of

  • Author: Udalski, A.

    Warsaw University Observatory, Poland

  • Author: Sumi, T.

    Department of Earth and Space Science, Osaka University, Japan

  • Author: Gould, A.

    xDepartment of Astronomy, Osaka University, United States

  • Author: Bozza, V.

    Università degli Studi di Salerno, Italy

  • Author: Dominik, M.

    School of Physics & Astronomy , University of St. Andrews, United Kingdom

  • Author: Fouque´, P.

    Universite de Toulouse, France

  • Author: Horne, K.

    School of Physics & Astronomy , University of St. Andrews, United Kingdom

  • Author: Szyman´ski, M. K.

    Warsaw University Observatory, Poland

  • Author: Kubiak, M.

    Warsaw University Observatory, Poland

  • Author: Soszyn´ski, I.

    Warsaw University Observatory, Poland

  • Author: Pietrzyn´ski, G.

    Warsaw University Observatory, Poland

  • Author: Poleski, R.

    Warsaw University Observatory, Poland

  • Author: Ulaczyk, K.

    Warsaw University Observatory, Poland

  • Author: Pietrukowicz, P.

    Warsaw University Observatory, Poland

  • Author: Kozłowski, S.

    Warsaw University Observatory, Poland

  • Author: Skowron, J.

    Department of Astronomy, Ohio State University, United States

  • Author: Wyrzykowski, Ł.

    Warsaw University Observatory, Poland

  • Author: Abe, F.

    Solar-Terrestrial Environ. Lab., Nagoya University, Japan

  • Author: Bennett, D. P.

    Dept. of Phys., University of Notre Dame, United States

  • Author: Bond, I. A.

    Massey University, New Zealand

  • Author: Botzler, C. S.

    University of Auckland, New Zealand

  • Author: Chote, P.

    Victoria University of Wellington, New Zealand

  • Author: Freeman, M.

    University of Auckland, New Zealand

  • Author: Fukui, A.

    Okayama Astrophysical Observatory, Japan

  • Author: Furusawa, K.

    Solar-Terrestrial Environment Laboratory, Nagoya University, Japan

  • Author: Itow, Y.

    Solar-Terrestrial Environ. Lab., Nagoya University, Japan

  • Author: Kobara, S.

    Solar-Terrestrial Environ. Lab., Nagoya University, Japan

  • Author: Ling, C. H.

    Massey University, New Zealand

  • Author: Masuda, K.

    Solar-Terrestrial Environ. Lab., Nagoya University, Japan

  • Author: Matsubara, Y.

    Solar-Terrestrial Environ. Lab., Nagoya University, Japan

  • Author: Miyake, N.

    Solar-Terrestrial Environ. Lab., Nagoya University, Japan

  • Author: Muraki, Y.

    Solar-Terrestrial Environ. Lab., Nagoya University, Japan

  • Author: Ohmori, K.

    Solar-Terrestrial Environ. Lab., Nagoya University, Japan

  • Author: Ohnishi, K.

    Nagano National College of Technology, Japan

  • Author: Rattenbury, N. J.

    University of Auckland, New Zealand

  • Author: Saito, To

    Tokyo Metropolitan College of Aeronautics, Japan

  • Author: Sullivan, D. J.

    Victoria University of Wellington, New Zealand

  • Author: Suzuki, D.

    Dept. of Earth & Space Sci., Osaka University, Japan

  • Author: Suzuki, K.

    Solar-Terrestrial Environ. Lab., Nagoya University, Japan

  • Author: Sweatman, W. L.

    Massey University, New Zealand

  • Author: Takino, S.

    Solar-Terrestrial Environ. Lab., Nagoya University, Japan

  • Author: Tristram, P. J.

    Victoria University of Wellington, New Zealand

  • Author: Wada, K.

    Dept. of Earth & Space Sci., Osaka University, Japan

  • Author: Yock, P. C. M.

    University of Auckland, New Zealand

  • Author: MOA Collaboration

    ,

    Dept. of Phys., Chungbuk National University, Korea, Republic of

  • Author: Bramich, D. M.

    European Southern Observatory, Germany

  • Author: Snodgrass, C.

    Max Planck Institute, Germany

  • Author: Steele, I. A.

    Astrophys. Res. Inst., Liverpool John Moores University, United Kingdom

  • Author: Street, R. A.

    Las Cumbres Observatory Global Telescope Network, United States

  • Author: Tsapras, Y.

    Las Cumbres Observatory Global Telescope Network, United States

  • Author: RoboNet Collaboration

    ,

    Dept. of Phys., Chungbuk National University, Korea, Republic of

  • Author: Alsubai, K. A.

    Qatar Foundation, Qatar

  • Author: Browne, P.

    Sch. of Phys. & Astron., University of St. Andrews, United Kingdom

  • Author: Burgdorf, M. J.

    Universität Stuttgart, Germany

  • Author: Calchi Novati, S.

    Università degli Studi di Salerno, Italy

  • Author: Dodds, P.

    Sch. of Phys. & Astron., University of St. Andrews, United Kingdom

  • Author: Dreizler, S.

    Inst. fur Astrophys., Georg-August-Universität, Germany

  • Author: Fang, X.-S

    Joint Lab. for Opt. Astron., National Astronomical Observatories, China

  • Author: Grundahl, Frank

    Aarhus University, Denmark

  • Author: Gu, C.-H

    Joint Lab. for Opt. Astron., National Astronomical Observatories, China

  • Author: Hardis, S.

    University of Copenhagen, Denmark

  • Author: Harpsøe, Kennet Bomann West

    Centre for Star and Planet Formation, Geological Museum, Denmark

  • Author: Hinse, T. C.

    University of Copenhagen, Denmark

  • Author: Hornstrup, Allan

    Astrophysics, National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Hundertmark, M.

    Sch. of Phys. & Astron., University of St. Andrews, United Kingdom

  • Author: Jessen-Hansen, Jens

    Aarhus University, Denmark

  • Author: Jørgensen, U. G.

    University of Copenhagen, Denmark

  • Author: Kains, N.

    ESO Headquarters, Germany

  • Author: Kerins, E.

    University of Manchester, United Kingdom

  • Author: Liebig, C.

    Sch. of Phys. & Astron., University of St. Andrews, United Kingdom

  • Author: Lund, M.

    Aarhus University, Denmark

  • Author: Lunkkvist, M.

    Aarhus University, Denmark

  • Author: Mancini, L.

    Max Planck Institute, Germany

  • Author: Mathiasen, M.

    University of Copenhagen, Denmark

  • Author: Penny, M. T.

    Dept. of Astron., Ohio State University, United States

  • Author: Rahvar, S.

    Dept. of Phys., Sharif University of Technology, Iran, Islamic Republic of

  • Author: Ricci, D.

    Institut d'Astrophysique et de Geophysique, Belgium

  • Author: Scarpetta, G.

    Università degli Studi di Salerno, Italy

  • Author: Skottfelt, J.

    University of Copenhagen, Denmark

  • Author: Southworth, J.

    Astrophys. Group, Keele University, United Kingdom

  • Author: Surdej, J.

    Institut d'Astrophysique et de Geophysique, Belgium

  • Author: Tregloan-Reed, J.

    Astrophys. Group, Keele University, United Kingdom

  • Author: Wambsganss, J.

    Zentrum für Astronomie der Universität Heidelberg, Germany

  • Author: Wertz, O.

    Institut d'Astrophysique et de Geophysique, Belgium

  • Author: Almeida, L. A.

    Instituto Nacional de Pesquisas Espaciais, Brazil

  • Author: Batista, V.

    Dept. of Astron., Ohio State University, United States

  • Author: Christie, G.

    Auckland Observatory, New Zealand

  • Author: DePoy, D. L.

    Dept. of Phys., Texas A&M University, United States

  • Author: Dong, Subo

    Institute for Advanced Study, United States

  • Author: Gaudi, B. S.

    Dept. of Astron., Ohio State University, United States

  • Author: Henderson, C.

    Dept. of Astron., Ohio State University, United States

  • Author: Jablonski, F.

    Instituto Nacional de Pesquisas Espaciais, Brazil

  • Author: Lee, C.-U

    Korea Astronomy and Space Science Institute, Korea, Republic of

  • Author: McCormick, J.

    Centre for Backyard Astrophys., Farm Cove Observatory, New Zealand

  • Author: McGregor, D.

    Dept. of Astron., Ohio State University, United States

  • Author: Moorhouse, D.

    Kumeu Observatory, New Zealand

  • Author: Natusch, T.

    Auckland Observatory, New Zealand

  • Author: Ngan, H.

    Auckland Observatory, New Zealand

  • Author: Park, S.-Y.

    Institute for Astrophysics, Chungbuk National University, Korea, Republic of

  • Author: Pogge, R. W.

    Dept. of Astron., Ohio State University, United States

  • Author: Tan, T.-G

    Perth Exoplanet Survey Telescope, Australia

  • Author: Thornley, G.

    Kumeu Observatory, New Zealand

  • Author: Yee, J. C.

    Department of Astronomy, Ohio State University, United States

  • Author: Albrow, M. D.

    University of Canterbury, New Zealand

  • Author: Bachelet, E.

    IRAP, Universite de Toulouse, France

  • Author: Beaulieu, J.-P

    Institut d'Astrophysique de Paris, UPMC, France

  • Author: Brillant, S.

    European Southern Observatory, Chile

  • Author: Cassan, A.

    Inst. d'Astrophys. de Paris, UPMC, France

  • Author: Cole, A. A.

    Sch. of Math. & Phys., University of Tasmania, Australia

  • Author: Corrales, E.

    Inst. d'Astrophys. de Paris, UPMC, France

  • Author: Coutures, C.

    Inst. d'Astrophys. de Paris, UPMC, France

  • Author: Dieters, S.

    Sch. of Math. & Phys., University of Tasmania, Australia

  • Author: Dominis Prester, D.

    Dept. of Phys., University of Rijeka, Croatia

  • Author: Donatowicz, J.

    Vienna University of Technology, Austria

  • Author: Greenhill, J.

    Sch. of Math. & Phys., University of Tasmania, Australia

  • Author: Kubas, D.

    Inst. d'Astrophys. de Paris, UPMC, France

  • Author: Marquette, J.-B

    Inst. d'Astrophys. de Paris, UPMC, France

  • Author: Menzies, J. W.

    South African Astronomical Observatory, South Africa

  • Author: Sahu, K. C.

    Space Telescope Science Institute, United States

  • Author: Zub, M.

    Astron. Rechen-Inst., Zentrum für Astronomie der Universität Heidelberg (ZAH), Germany

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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 0.43 M⊙ and 0.39 M⊙ for MOA-2011-BLG-090 and 0.57 M⊙ and 0.17 M⊙ 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.
Original languageEnglish
JournalAstrophysical Journal
Publication date2012
Volume755
Issue2
Pages91
Number of pages10
ISSN0004-637X
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 4

Keywords

  • Binaries: general, Gravitational lensing: micro
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