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, Korea, Republic of

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

  • Author: Han, C., Korea, Republic of

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

  • Author: Choi, J.-Y, Korea, Republic of

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

  • Author: Udalski, A., Poland

    Warsaw University Observatory, Poland

  • Author: Sumi, T., Japan

    Department of Earth and Space Science, Osaka University, Japan

  • Author: Gould, A., United States

    xDepartment of Astronomy, Osaka University, United States

  • Author: Bozza, V., Italy

    Dipartimento di Fisica, Universita degli Studi di Salerno, Italy

  • Author: Dominik, M., United Kingdom

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

  • Author: Fouque´, P., France

    Universite de Toulouse, France

  • Author: Horne, K., United Kingdom

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

  • Author: Szyman´ski, M. K., Poland

    Warsaw University Observatory, Poland

  • Author: Kubiak, M., Poland

    Warsaw University Observatory, Poland

  • Author: Soszyn´ski, I., Poland

    Warsaw University Observatory, Poland

  • Author: Pietrzyn´ski, G., Poland

    Warsaw University Observatory, Poland

  • Author: Poleski, R., Poland

    Warsaw University Observatory, Poland

  • Author: Ulaczyk, K., Poland

    Warsaw University Observatory, Poland

  • Author: Pietrukowicz, P., Poland

    Warsaw University Observatory, Poland

  • Author: Kozłowski, S., Poland

    Warsaw University Observatory, Poland

  • Author: Skowron, J., United States

    Department of Astronomy, Ohio State University, United States

  • Author: Wyrzykowski, Ł., Poland

    Warsaw University Observatory, Poland

  • Author: Abe, F., Japan

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

  • Author: Bennett, D. P., United States

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

  • Author: Bond, I. A., New Zealand

    North Shore Mail Centre, Massey University, New Zealand

  • Author: Botzler, C. S., New Zealand

    Dept. of Phys., University of Auckland, New Zealand

  • Author: Chote, P., New Zealand

    Sch. of Chem. & Phys. Sci., Victoria University of Wellington, New Zealand

  • Author: Freeman, M., New Zealand

    Department of Physics, University of Auckland, New Zealand

  • Author: Fukui, A., Japan

    Okayama Astrophysical Observatory, Japan

  • Author: Furusawa, K., Japan

    Solar-Terrestrial Environment Laboratory, Nagoya University, Japan

  • Author: Itow, Y., Japan

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

  • Author: Kobara, S., Japan

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

  • Author: Ling, C. H., New Zealand

    North Shore Mail Centre, Massey University, New Zealand

  • Author: Masuda, K., Japan

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

  • Author: Matsubara, Y., Japan

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

  • Author: Miyake, N., Japan

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

  • Author: Muraki, Y., Japan

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

  • Author: Ohmori, K., Japan

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

  • Author: Ohnishi, K., Japan

    Nagano National College of Technology, Japan

  • Author: Rattenbury, N. J., New Zealand

    Dept. of Phys., University of Auckland, New Zealand

  • Author: Saito, To, Japan

    Tokyo Metropolitan College of Aeronautics, Japan

  • Author: Sullivan, D. J., New Zealand

    Sch. of Chem. & Phys. Sci., Victoria University of Wellington, New Zealand

  • Author: Suzuki, D., Japan

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

  • Author: Suzuki, K., Japan

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

  • Author: Sweatman, W. L., New Zealand

    North Shore Mail Centre, Massey University, New Zealand

  • Author: Takino, S., Japan

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

  • Author: Tristram, P. J., New Zealand

    Sch. of Chem. & Phys. Sci., Victoria University of Wellington, New Zealand

  • Author: Wada, K., Japan

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

  • Author: Yock, P. C. M., New Zealand

    Dept. of Phys., University of Auckland, New Zealand

  • Author: MOA Collaboration, Korea, Republic of

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

  • Author: Bramich, D. M., Germany

    European Southern Observatory, Germany

  • Author: Snodgrass, C., Germany

    Max Planck Institute for Solar System Research, Germany

  • Author: Steele, I. A., United Kingdom

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

  • Author: Street, R. A., United States

    Las Cumbres Observatory Global Telescope Network, United States

  • Author: Tsapras, Y., United States

    Las Cumbres Observatory Global Telescope Network, United States

  • Author: RoboNet Collaboration, Korea, Republic of

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

  • Author: Alsubai, K. A., Qatar

    Qatar Foundation, Qatar

  • Author: Browne, P., United Kingdom

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

  • Author: Burgdorf, M. J., Germany

    Universität Stuttgart, Germany

  • Author: Calchi Novati, S., Italy

    Dipt. di Fis. E.R. Caianiello, Universita degli Studi di Salerno, Italy

  • Author: Dodds, P., United Kingdom

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

  • Author: Dreizler, S., Germany

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

  • Author: Fang, X.-S, China

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

  • Author: Grundahl, Frank, Denmark

    Institut for Fysik og Astronomi, Aarhus Universitet, Denmark

  • Author: Gu, C.-H, China

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

  • Author: Hardis, S., Denmark

    Niels Bohr Inst., University of Copenhagen, Denmark

  • Author: Harpsøe, Kennet Bomann West, Denmark

    Centre for Star and Planet Formation, Geological Museum, Denmark

  • Author: Hinse, T. C., Denmark

    Niels Bohr Inst., University of Copenhagen, Denmark

  • Author: Hornstrup, Allan

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

  • Author: Hundertmark, M., United Kingdom

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

  • Author: Jessen-Hansen, Jens, Denmark

    Department of Physics and Astronomy, Aarhus University, Denmark

  • Author: Jørgensen, U. G., Denmark

    Niels Bohr Inst., University of Copenhagen, Denmark

  • Author: Kains, N., Germany

    ESO Headquarters, Germany

  • Author: Kerins, E., United Kingdom

    University of Manchester, United Kingdom

  • Author: Liebig, C., United Kingdom

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

  • Author: Lund, M., Denmark

    Department of Physics and Astronomy, Aarhus University, Denmark

  • Author: Lunkkvist, M., Denmark

    Department of Physics and Astronomy, Aarhus University, Denmark

  • Author: Mancini, L., Germany

    Max Planck Institute for Astronomy, Germany

  • Author: Mathiasen, M., Denmark

    Niels Bohr Institute, University of Copenhagen, Denmark

  • Author: Penny, M. T., United States

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

  • Author: Rahvar, S., Iran, Islamic Republic of

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

  • Author: Ricci, D., Belgium

    Institut d'Astrophysique et de Geophysique, Belgium

  • Author: Scarpetta, G., Italy

    Dipt. di Fis. E.R. Caianiello, Universita degli Studi di Salerno, Italy

  • Author: Skottfelt, J., Denmark

    Niels Bohr Institute, University of Copenhagen, Denmark

  • Author: Southworth, J., United Kingdom

    Astrophys. Group, Keele University, United Kingdom

  • Author: Surdej, J., Belgium

    Institut d'Astrophysique et de Geophysique, Belgium

  • Author: Tregloan-Reed, J., United Kingdom

    Astrophys. Group, Keele University, United Kingdom

  • Author: Wambsganss, J., Germany

    Zentrum für Astronomie der Universität Heidelberg, Germany

  • Author: Wertz, O., Belgium

    Institut d'Astrophysique et de Geophysique, Belgium

  • Author: Almeida, L. A., Brazil

    Instituto Nacional de Pesquisas Espaciais, Brazil

  • Author: Batista, V., United States

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

  • Author: Christie, G., New Zealand

    Auckland Observatory, New Zealand

  • Author: DePoy, D. L., United States

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

  • Author: Dong, Subo, United States

    Institute for Advanced Study, United States

  • Author: Gaudi, B. S., United States

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

  • Author: Henderson, C., United States

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

  • Author: Jablonski, F., Brazil

    Instituto Nacional de Pesquisas Espaciais, Brazil

  • Author: Lee, C.-U, Korea, Republic of

    Korea Astronomy and Space Science Institute, Korea, Republic of

  • Author: McCormick, J., New Zealand

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

  • Author: McGregor, D., United States

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

  • Author: Moorhouse, D., New Zealand

    Kumeu Observatory, New Zealand

  • Author: Natusch, T., New Zealand

    Auckland Observatory, New Zealand

  • Author: Ngan, H., New Zealand

    Auckland Observatory, New Zealand

  • Author: Park, S.-Y., Korea, Republic of

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

  • Author: Pogge, R. W., United States

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

  • Author: Tan, T.-G, Australia

    Perth Exoplanet Survey Telescope, Australia

  • Author: Thornley, G., New Zealand

    Kumeu Observatory, New Zealand

  • Author: Yee, J. C., United States

    Department of Astronomy, Ohio State University, United States

  • Author: Albrow, M. D., New Zealand

    Dept. of Phys. & Astron., University of Canterbury, New Zealand

  • Author: Bachelet, E., France

    IRAP, Universite de Toulouse, France

  • Author: Beaulieu, J.-P, France

    Institut d'Astrophysique de Paris, UPMC, France

  • Author: Brillant, S., Chile

    European Southern Observatory, Chile

  • Author: Cassan, A., France

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

  • Author: Cole, A. A., Australia

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

  • Author: Corrales, E., France

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

  • Author: Coutures, C., France

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

  • Author: Dieters, S., Australia

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

  • Author: Dominis Prester, D., Croatia

    Dept. of Phys., University of Rijeka, Croatia

  • Author: Donatowicz, J., Austria

    Dept. of Comput., Technical University of Vienna, Austria

  • Author: Greenhill, J., Australia

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

  • Author: Kubas, D., France

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

  • Author: Marquette, J.-B, France

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

  • Author: Menzies, J. W., South Africa

    South African Astronomical Observatory, South Africa

  • Author: Sahu, K. C., United States

    Space Telescope Science Institute, United States

  • Author: Zub, M., Germany

    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
Journal number2
Pages91
Number of pages10
ISSN0004-637X
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 3

Keywords

  • Binaries: general, Gravitational lensing: micro
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