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Frank Grundahl

Microlensing Binaries with Candidate Brown Dwarf Companions

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  • I.-G. Shin, Department of Physics, Institute for Astrophysics, Chungbuk National University, Cheongju 371-763, Republic of Korea
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  • C. Han, Department of Physics, Institute for Astrophysics, Chungbuk National University, Cheongju 371-763, Republic of Korea
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  • A. Gould, Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
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  • A. Udalski, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
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  • T. Sumi, Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan
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  • M. Dominik, SUPA, University of St. Andrews, School of Physics & Astronomy, North Haugh, St. Andrews KY16 9SS, UK
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  • J.-P. Beaulieu, Institut d'Astrophysique de Paris, UMR7095 CNRS-Université Pierre & Marie Curie, 98 bis boulevard Arago, F-75014 Paris, France
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  • Y. Tsapras, Las Cumbres Observatory Global Telescope Network, 6740B Cortona Dr., Suite 102, Goleta, CA 93117, USA
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  • V. Bozza, Dipartimento di Fisica "E. R. Caianiello," Università degli Studi di Salerno, Via S. Allende, I-84081 Baronissi (SA), Italy
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  • M. K. Szymański, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
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  • M. Kubiak, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
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  • I. Soszyński, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
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  • G. Pietrzyński, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
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  • R. Poleski, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
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  • K. Ulaczyk, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
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  • P. Pietrukowicz, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
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  • S. Kozłowski, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
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  • J. Skowron, Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
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  • Ł. Wyrzykowski, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
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  • The OGLE Collaboration
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  • F. Abe, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • D. P. Bennett, University of Notre Dame
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  • I. A. Bond, Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
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  • C. S. Botzler, Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
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  • M. Freeman, Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
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  • A. Fukui, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • K. Furusawa, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • F. Hayashi, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • J. B. Hearnshaw, Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand
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  • S. Hosaka, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • Y. Itow, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • K. Kamiya, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • P. M. Kilmartin, Mt. John Observatory, P.O. Box 56, Lake Tekapo 8770, New Zealand
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  • S. Kobara, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • A. Korpela, School of Chemical and Physical Sciences, Victoria University, Wellington, New Zealand
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  • W. Lin, Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
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  • C. H. Ling, Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
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  • S. Makita, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • K. Masuda, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • Y. Matsubara, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • N. Miyake, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • Y. Muraki, Department of Physics, Konan University, Nishiokamoto 8-9-1, Kobe 658-8501, Japan
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  • M. Nagaya, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • K. Nishimoto, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • K. Ohnishi, Nagano National College of Technology, Nagano 381-8550, Japan
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  • T. Okumura, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • K. Omori, Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
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  • Y. C. Perrott, Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
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  • N. Rattenbury, Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
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  • To. Saito, Tokyo Metropolitan College of Industrial Technology, Tokyo 116-8523, Japan
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  • L. Skuljan, Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
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  • D. J. Sullivan, School of Chemical and Physical Sciences, Victoria University, Wellington, New Zealand
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  • D. Suzuki, Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan
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  • W. L. Sweatman, Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
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  • P. J. Tristram, Mt. John Observatory, P.O. Box 56, Lake Tekapo 8770, New Zealand
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  • K. Wada, Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan
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  • P. C. M. Yock, Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
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  • The MOA Collaboration
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  • G. W. Christie, Auckland Observatory, P.O. Box 24-180, Auckland, New Zealand
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  • D. L. Depoy, Department of Physics, Texas A&M University, College Station, TX 77843-4242, USA
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  • S. Dong, Institute for Advanced Study, Einstein Dr., Princeton, NJ 08540, USA
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  • A. Gal-Yam, Benoziyo Center for Astrophysics, The Weizmann Institute, Rehovot 76100, Israel
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  • B. S. Gaudi, Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
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  • L.-W. Hung, Department of Physics & Astronomy, University of California, Los Angeles, CA 90095, USA
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  • J. Janczak, Department of Physics, Ohio State University, 191 W. Woodruff, Columbus, OH 43210, USA
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  • S. Kaspi, School of Physics and Astronomy, Tel-Aviv University, Tel Aviv 69978, Israel
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  • D. Maoz, School of Physics and Astronomy, Tel-Aviv University, Tel Aviv 69978, Israel
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  • J. McCormick, Farm Cove Observatory, Pakuranga, Auckland
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  • D. McGregor, Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
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  • D. Moorhouse, Kumeu Observatory, Kumeu, New Zealand
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  • J. A. Muñoz, Departamento de Astronomìa y Astrofìsica, Universidad de Valencia, E-46100 Burjassot, Valencia, Spain
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  • T. Natusch, Auckland Observatory, P.O. Box 24-180, Auckland, New Zealand
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  • C. Nelson, College of Optical Sciences, University of Arizona, 1630 E. University Blvd., Tucson, AZ 85721, USA
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  • R. W. Pogge, Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
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  • T.-G. Tan, Perth Exoplanet Survey Telescope, Perth, Australia
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  • D. Polishook, School of Physics and Astronomy, Tel-Aviv University, Tel Aviv 69978, Israel
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  • Y. Shvartzvald, School of Physics and Astronomy, Tel-Aviv University, Tel Aviv 69978, Israel
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  • A. Shporer, Las Cumbres Observatory Global Telescope Network, 6740B Cortona Dr., Suite 102, Goleta, CA 93117, USA
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  • G. Thornley, Kumeu Observatory, Kumeu, New Zealand
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  • U. Malamud, School of Physics and Astronomy, Tel-Aviv University, Tel Aviv 69978, Israel
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  • J. C. Yee, Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
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  • J.-Y. Choi, Department of Physics, Institute for Astrophysics, Chungbuk National University, Cheongju 371-763, Republic of Korea
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  • Y.-K. Jung, Department of Physics, Institute for Astrophysics, Chungbuk National University, Cheongju 371-763, Republic of Korea
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  • H. Park, Department of Physics, Institute for Astrophysics, Chungbuk National University, Cheongju 371-763, Republic of Korea
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  • C.-U. Lee, Korea Astronomy and Space Science Institute, 776 Daedukdae-ro, Yuseong-gu, Daejeon 305-348, Republic of Korea
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  • B.-G. Park, Korea Astronomy and Space Science Institute, 776 Daedukdae-ro, Yuseong-gu, Daejeon 305-348, Republic of Korea
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  • J.-R. Koo, Korea Astronomy and Space Science Institute, 776 Daedukdae-ro, Yuseong-gu, Daejeon 305-348, Republic of Korea
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  • The μFUN Collaboration
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  • D. Bajek, SUPA, University of St. Andrews, School of Physics & Astronomy, North Haugh, St. Andrews KY16 9SS, UK
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  • D. M. Bramich, European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany
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  • P. Browne, SUPA, University of St. Andrews, School of Physics & Astronomy, North Haugh, St. Andrews KY16 9SS, UK
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  • K. Horne, SUPA, University of St. Andrews, School of Physics & Astronomy, North Haugh, St. Andrews KY16 9SS, UK
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  • S. Ipatov, Qatar Foundation, P.O. Box 5825, Doha, Qatar
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  • C. Snodgrass, Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Strasse 2, D-37191 Katlenburg-Lindau, Germany
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  • I. Steele, Liverpool John Moores University
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  • R. Street, Las Cumbres Observatory Global Telescope Network, 6740B Cortona Dr., Suite 102, Goleta, CA 93117, USA
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  • K. A. Alsubai, Qatar Foundation, P.O. Box 5825, Doha, Qatar
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  • M. J. Burgdorf, HE Space Operations GmbH, Flughafenallee 24, D-28199 Bremen, Germany
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  • S. Calchi Novati, Dipartimento di Fisica "E. R. Caianiello," Università degli Studi di Salerno, Via S. Allende, I-84081 Baronissi (SA), Italy
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  • P. Dodds, SUPA, University of St. Andrews, School of Physics & Astronomy, North Haugh, St. Andrews KY16 9SS, UK
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  • S. Dreizler, Institut für Astrophysik, Georg-August-Universität, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
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  • X.-S. Fang, National Astronomical Observatories/Yunnan Observatory, Joint laboratory for Optical Astronomy, Chinese Academy of Sciences, Kunming 650011, China
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  • F. Grundahl
  • C.-H. Gu, National Astronomical Observatories/Yunnan Observatory, Joint laboratory for Optical Astronomy, Chinese Academy of Sciences, Kunming 650011, China
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  • S. Hardis, Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark
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  • Kennet Bomann West Harpsøe, Niels Bohr Institutet - Afd., Denmark
  • T. C. Hinse, Korea Astronomy and Space Science Institute, 776 Daedukdae-ro, Yuseong-gu, Daejeon 305-348, Republic of Korea
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  • M. Hundertmark, SUPA, University of St. Andrews, School of Physics & Astronomy, North Haugh, St. Andrews KY16 9SS, UK
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  • J. Jessen-Hansen
  • U. G. Jørgensen, Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark
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  • N. Kains, SUPA, University of St. Andrews, School of Physics & Astronomy, North Haugh, St. Andrews KY16 9SS, UK
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  • E. Kerins, Jodrell Bank Centre for Astrophysics, University of Manchester, Oxford Road, Manchester M13 9PL, UK
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  • C. Liebig, SUPA, University of St. Andrews, School of Physics & Astronomy, North Haugh, St. Andrews KY16 9SS, UK
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  • Mikkel Nørup Lund
  • M. Lundkvist
  • L. Mancini, Dipartimento di Fisica "E. R. Caianiello," Università degli Studi di Salerno, Via S. Allende, I-84081 Baronissi (SA), Italy
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  • M. Mathiasen, Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark
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  • A. Hornstrup, Technical University of Denmark
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  • M. T. Penny, Jodrell Bank Centre for Astrophysics, University of Manchester, Oxford Road, Manchester M13 9PL, UK
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  • S. Proft, Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstrasse 12-14, D-69120 Heidelberg, Germany
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  • S. Rahvar, Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran
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  • D. Ricci, Institut d'Astrophysique et de Géophysique, Allée du 6 Août 17, Sart Tilman, Bât. B5c, B-4000 Liège, Belgium
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  • G. Scarpetta, Dipartimento di Fisica "E. R. Caianiello," Università degli Studi di Salerno, Via S. Allende, I-84081 Baronissi (SA), Italy
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  • Jesper Fælling Skottfelt, Astrofysik og Planetforskning, Denmark
  • J. Southworth, Astrophysics Group, Keele University, Newcastle-under-Lyme ST5 5BG, UK
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  • J. Surdej, Institut d'Astrophysique et de Géophysique, Allée du 6 Août 17, Sart Tilman, Bât. B5c, B-4000 Liège, Belgium
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  • J. Tregloan-Reed, Astrophysics Group, Keele University, Newcastle-under-Lyme ST5 5BG, UK
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  • O. Wertz, Institut d'Astrophysique et de Géophysique, Allée du 6 Août 17, Sart Tilman, Bât. B5c, B-4000 Liège, Belgium
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  • F. Zimmer, Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstrasse 12-14, D-69120 Heidelberg, Germany
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  • M. D. Albrow, Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand
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  • V. Batista, Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
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  • S. Brillant, European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile
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  • J. A. R. Caldwell, McDonald Observatory, 16120 State Hwy Spur 78 #2, Fort Davis, TX 79334, USA
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  • J. J. Calitz, Faculty of Natural and Agricultural Sciences, Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa
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  • A. Cassan, Institut d'Astrophysique de Paris, UMR7095 CNRS-Université Pierre & Marie Curie, 98 bis boulevard Arago, F-75014 Paris, France
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  • A. Cole, School of Math and Physics, University of Tasmania, Private Bag 37, GPO Hobart, Tasmania 7001, Australia
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  • K. H. Cook, Institute of Geophysics and Planetary Physics (IGPP), L-413, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94451, USA
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  • E. Corrales, Institut d'Astrophysique de Paris, UMR7095 CNRS-Université Pierre & Marie Curie, 98 bis boulevard Arago, F-75014 Paris, France
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  • Ch. Coutures, Institut d'Astrophysique de Paris, UMR7095 CNRS-Université Pierre & Marie Curie, 98 bis boulevard Arago, F-75014 Paris, France
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  • S. Dieters, Institut d'Astrophysique de Paris, UMR7095 CNRS-Université Pierre & Marie Curie, 98 bis boulevard Arago, F-75014 Paris, France
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  • D. Dominis Prester, Faculty of Arts and Sciences, Physics Department, University of Rijeka, Omladinska 14, 51000 Rijeka, Croatia
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  • J. Donatowicz, Department of Computing, Technical University of Vienna, Wiedner Hauptstrasse 10, A-1040 Vienna, Austria
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  • P. Fouqué, LATT, Université de Toulouse, CNRS, 14 Avenue Edouard Belin, F-31400 Toulouse, France
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  • S. R. Kane, NASA Exoplanet Science Institute, Caltech, MS 100-22, 770 South Wilson Avenue, Pasadena, CA 91125, USA
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  • D. Kubas, Institut d'Astrophysique de Paris, UMR7095 CNRS-Université Pierre & Marie Curie, 98 bis boulevard Arago, F-75014 Paris, France
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  • R. Martin, Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia
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  • A. Williams, Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia
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  • Christian Vinter, Niels Bohr Institutet, Denmark
  • M. Zub, Astronomisches Rechen-Institut (ARI), Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstrasse 12-14, D-69120 Heidelberg, Germany
Brown dwarfs are important objects because they may provide a missing link between stars and planets, two populations that have dramatically different formation histories. In this paper, we present the candidate binaries with brown dwarf companions that are found by analyzing binary microlensing events discovered during the 2004-2011 observation seasons. Based on the low mass ratio criterion of q <0.2, we found seven candidate events: OGLE-2004-BLG-035, OGLE-2004-BLG-039, OGLE-2007-BLG-006, OGLE-2007-BLG-399/MOA-2007-BLG-334, MOA-2011-BLG-104/OGLE-2011-BLG-0172, MOA-2011-BLG-149, and MOA-201-BLG-278/OGLE-2011-BLG-012N. Among them, we are able to confirm that the companions of the lenses of MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149 are brown dwarfs by determining the mass of the lens based on the simultaneous measurement of the Einstein radius and the lens parallax. The measured masses of the brown dwarf companions are 0.02 ± 0.01 M ☉ and 0.019 ± 0.002 M ☉ for MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149, respectively, and both companions are orbiting low-mass M dwarf host stars. More microlensing brown dwarfs are expected to be detected as the number of lensing events with well-covered light curves increases with new-generation searches.
Original languageEnglish
JournalAstrophysical Journal
Volume760
Issue2
Pages (from-to)116
Number of pages10
ISSN0004-637X
DOIs
Publication statusPublished - 1 Dec 2012

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