[en] We present the analysis of the light curves of nine high-magnification single-lens gravitational microlensing events with lenses passing over source stars, including OGLE-2004-BLG-254, MOA-2007-BLG-176, MOA-2007-BLG-233/OGLE-2007-BLG-302, MOA-2009-BLG-174, MOA-2010-BLG-436, MOA-2011-BLG-093, MOA-2011-BLG-274, OGLE-2011-BLG-0990/MOA-2011-BLG-300, and OGLE-2011-BLG-1101/MOA-2011-BLG-325. For all of the events, we measure the linear limb-darkening coefficients of the surface brightness profile of source stars by measuring the deviation of the light curves near the peak affected by the finite-source effect. For seven events, we measure the Einstein radii and the lens-source relative proper motions. Among them, five events are found to have Einstein radii of less than 0.2 mas, making the lenses very low mass star or brown dwarf candidates. For MOA-2011-BLG-274, especially, the small Einstein radius of θ[SUB]E[/SUB] ~ 0.08 mas combined with the short timescale of t [SUB]E[/SUB] ~ 2.7 days suggests the possibility that the lens is a free-floating planet. For MOA-2009-BLG-174, we measure the lens parallax and thus uniquely determine the physical parameters of the lens. We also find that the measured lens mass of ~0.84 M [SUB]&sun;[/SUB] is consistent with that of a star blended with the source, suggesting that the blend is likely to be the lens. Although we did not find planetary signals for any of the events, we provide exclusion diagrams showing the confidence levels excluding the existence of a planet as a function of the separation and mass ratio.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Choi, J.-Y.; Department of Physics, Institute for Astrophysics, Chungbuk National University, Cheongju 371-763, Republic of Korea
Shin, I.-G.; Department of Physics, Institute for Astrophysics, Chungbuk National University, Cheongju 371-763, Republic of Korea
Park, S.-Y.; Department of Physics, Institute for Astrophysics, Chungbuk National University, Cheongju 371-763, Republic of Korea
Han, C.; Department of Physics, Institute for Astrophysics, Chungbuk National University, Cheongju 371-763, Republic of Korea ; The μFUN Collaboration. ; Corresponding author.
Gould, A.; Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA ; The μFUN Collaboration.
Sumi, T.; Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan ; The MOA Collaboration.
Udalski, A.; Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland ; The OGLE Collaboration.
Beaulieu, J.-P.; Institut d'Astrophysique de Paris, UMR7095 CNRS-Université Pierre & Marie Curie, 98 bis boulevard Arago, 75014 Paris, France ; The PLANET Collaboration.
Street, R.; Las Cumbres Observatory Global Telescope Network, 6740B Cortona Dr, Suite 102, Goleta, CA 93117, USA ; The RoboNet Collaboration.
Dominik, M.; School of Physics & Astronomy, SUPA, University of St. Andrews, North Haugh, St. Andrews, KY16 9SS, UK ; The MiNDSTEp Consortium.
Allen, W.; Vintage Lane Observatory, Blenheim, New Zealand
Almeida, L. A.; Instituto Nacional de Pesquisas Espaciais/MCTI, São José dos Campos, São Paulo, Brazil
Bos, M.; Molehill Astronomical Observatory, North Shore, New Zealand
Christie, G. W.; Auckland Observatory, P.O. Box 24-180, Auckland, New Zealand
Depoy, D. L.; Department of Physics, Texas A&M University, College Station, TX, USA
Dong, S.; Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540, USA
Drummond, J.; Possum Observatory, Patutahi, New Zealand
Gal-Yam, A.; Benoziyo Center for Astrophysics, The Weizmann Institute, Israel
Gaudi, B. S.; Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
Henderson, C. B.; Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
Hung, L.-W.; Department of Physics & Astronomy, University of California Los Angeles, Los Angeles, CA 90095, USA
Jablonski, F.; Instituto Nacional de Pesquisas Espaciais/MCTI, São José dos Campos, São Paulo, Brazil
Janczak, J.; Department of Physics, Ohio State University, 191 W. Woodruff, Columbus, OH 43210, USA
Lee, C.-U.; Korea Astronomy and Space Science Institute, Daejeon 305-348, Republic of Korea
Mallia, F.; Campo Catino Austral Observatory, San Pedro de Atacama, Chile
Maury, A.; Campo Catino Austral Observatory, San Pedro de Atacama, Chile
McGregor, D.; Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
Monard, L. A. G.; Bronberg Observatory, Pretoria, South Africa
Moorhouse, D.; Kumeu Observatory, Kumeu, New Zealand
Muñoz, J. A.; Departamento de Astronomía y Astrofísica, Universidad de Valencia, E-46100 Burjassot, Valencia, Spain
Natusch, T.; Auckland Observatory, P.O. Box 24-180, Auckland, New Zealand
Nelson, C.; College of Optical Sciences, University of Arizona, 1630 E. University Blvd, Tucson, AZ 85721, USA
Park, B.-G.; Korea Astronomy and Space Science Institute, Daejeon 305-348, Republic of Korea
Pogge, R. W.; Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
"TG" Tan, T.-G.; Perth Exoplanet Survey Telescope, Perth, Australia
Thornley, G.; Kumeu Observatory, Kumeu, New Zealand
Yee, J. C.; Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
The μFUN Collaboration
Abe, F.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Barnard, E.; Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
Baudry, J.; Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
Bennett, D. P.; Department of Physics, University of Notre Damey, Notre Dame, IN 46556, USA
Bond, I. A.; Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
Botzler, C. S.; Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
Freeman, M.; Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
Fukui, A.; Okayama Astrophysical Observatory, NAOJ, Okayama 719-0232, Japan
Furusawa, K.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Hayashi, F.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Hearnshaw, J. B.; Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand
Hosaka, S.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Itow, Y.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Kamiya, K.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Kilmartin, P. M.; Mt. John Observatory, P.O. Box 56, Lake Tekapo 8770, New Zealand
Kobara, S.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Korpela, A.; School of Chemical and Physical Sciences, Victoria University, Wellington, New Zealand
Lin, W.; Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
Ling, C. H.; Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
Makita, S.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Masuda, K.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Matsubara, Y.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Miyake, N.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Muraki, Y.; Department of Physics, Konan University, Nishiokamoto 8-9-1, Kobe 658-8501, Japan
Nagaya, M.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Nishimoto, K.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Ohnishi, K.; Nagano National College of Technology, Nagano 381-8550, Japan
Okumura, T.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Omori, K.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Perrott, Y. C.; Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
Rattenbury, N.; Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
Saito, To; Tokyo Metropolitan College of Industrial Technology, Tokyo 116-8523, Japan
Skuljan, L.; Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
Sullivan, D. J.; School of Chemical and Physical Sciences, Victoria University, Wellington, New Zealand
Suzuki, D.; Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan
Suzuki, K.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Sweatman, W. L.; Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
Takino, S.; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Tristram, P. J.; Mt. John Observatory, P.O. Box 56, Lake Tekapo 8770, New Zealand
Wada, K.; Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan
Yock, P. C. M.; Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
The MOA Collaboration
Szymański, M. K.; Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
Kubiak, M.; Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
Pietrzyński, G.; Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland ; Departamento de Fisica, Universidad de Concepción, Casilla 160-C, Concepción, Chile
Cassan, A.; Institut d'Astrophysique de Paris, UMR7095 CNRS-Université Pierre & Marie Curie, 98 bis boulevard Arago, 75014 Paris, France
Cole, A.; School of Math and Physics, University of Tasmania, Private Bag 37, GPO Hobart, Tasmania 7001, Australia
Corrales, E.; Institut d'Astrophysique de Paris, UMR7095 CNRS-Université Pierre & Marie Curie, 98 bis boulevard Arago, 75014 Paris, France
Coutures, Ch; Institut d'Astrophysique de Paris, UMR7095 CNRS-Université Pierre & Marie Curie, 98 bis boulevard Arago, 75014 Paris, France
Dieters, S.; Institut d'Astrophysique de Paris, UMR7095 CNRS-Université Pierre & Marie Curie, 98 bis boulevard Arago, 75014 Paris, France ; LATT, Université de Toulouse, CNRS, 14 Avenue Edouard Belin, 31400 Toulouse, France
Dominis Prester, D.; Physics Department, Faculty of Arts and Sciences, University of Rijeka, Omladinska 14, 51000 Rijeka, Croatia
Donatowicz, J.; Department of Computing, Technical University of Vienna, Wiedner Hauptstrasse 10, Vienna, Austria
Fouqué, P.; LATT, Université de Toulouse, CNRS, 14 Avenue Edouard Belin, 31400 Toulouse, France
Greenhill, J.; School of Math and Physics, University of Tasmania, Private Bag 37, GPO Hobart, Tasmania 7001, Australia
Kane, S. R.; NASA Exoplanet Science Institute, Caltech, MS 100-22, 770 South Wilson Avenue, Pasadena, CA 91125, USA
Menzies, J.; South African Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa
Sahu, K. C.; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Wambsganss, J.; Astronomisches Rechen-Institut (ARI), Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstrasse 12-14, 69120 Heidelberg, Germany
Williams, A.; Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia
Zub, M.; Astronomisches Rechen-Institut (ARI), Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstrasse 12-14, 69120 Heidelberg, Germany
The PLANET Collaboration
Allan, A.; School of Physics, University of Exeter, Stocker Road, Exeter, Devon, EX4 4QL, UK
Bramich, D. M.; European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching bei München, Germany
Browne, P.; School of Physics & Astronomy, SUPA, University of St. Andrews, North Haugh, St. Andrews, KY16 9SS, UK
Clay, N.; Astrophysics Research Institute, Liverpool John Moores University, Egerton Wharf, Birkenhead, CH41 1LD, UK
Fraser, S.; Astrophysics Research Institute, Liverpool John Moores University, Egerton Wharf, Birkenhead, CH41 1LD, UK
Horne, K.; School of Physics & Astronomy, SUPA, University of St. Andrews, North Haugh, St. Andrews, KY16 9SS, UK
Kains, N.; European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching bei München, Germany
Mottram, C.; Astrophysics Research Institute, Liverpool John Moores University, Egerton Wharf, Birkenhead, CH41 1LD, UK
Snodgrass, C.; European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile ; Max-Planck-Institut för Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
Steele, I.; Astrophysics Research Institute, Liverpool John Moores University, Egerton Wharf, Birkenhead, CH41 1LD, UK
Tsapras, Y.; Las Cumbres Observatory Global Telescope Network, 6740B Cortona Dr, Suite 102, Goleta, CA 93117, USA
The RoboNet Collaboration
Alsubai, K. A.; Qatar Foundation, P.O. Box 5825, Doha, Qatar
Bozza, V.; Department of Physics, University of Salerno, Via Ponte Don Melillo, 84084 Fisciano (SA), Italy
Burgdorf, M. J.; Deutsches SOFIA Institut, Universität Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germany
Calchi Novati, S.; Department of Physics, University of Salerno, Via Ponte Don Melillo, 84084 Fisciano (SA), Italy
Dodds, P.; School of Physics & Astronomy, SUPA, University of St. Andrews, North Haugh, St. Andrews, KY16 9SS, UK
Finet, François ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Gerner, T.; Astronomisches Rechen-Institut (ARI), Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstrasse 12-14, 69120 Heidelberg, Germany
Glitrup, M.; Department of Physics & Astronomy, Aarhus University, Ny Munkegade 120, 8000 Århus C, Denmark
Grundahl, F.; Department of Physics & Astronomy, Aarhus University, Ny Munkegade 120, 8000 Århus C, Denmark
Hardis, S.; Niels Bohr Institutet, Københavns Universitet, Juliane Maries Vej 30, 2100 København Ø, Denmark
Harpsøe, K.; Niels Bohr Institutet, Københavns Universitet, Juliane Maries Vej 30, 2100 København Ø, Denmark ; Centre for Star and Planet Formation, Geological Museum, Øster Voldgade 5, 1350 Copenhagen, Denmark
Hinse, T. C.; Korea Astronomy and Space Science Institute, Daejeon 305-348, Republic of Korea ; Niels Bohr Institutet, Københavns Universitet, Juliane Maries Vej 30, 2100 København Ø, Denmark
Hundertmark, M.; School of Physics & Astronomy, SUPA, University of St. Andrews, North Haugh, St. Andrews, KY16 9SS, UK ; Institut für Astrophysik, Georg-August-Universität, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
Jørgensen, U. G.; Niels Bohr Institutet, Københavns Universitet, Juliane Maries Vej 30, 2100 København Ø, Denmark
Kerins, E.; Jodrell Bank Centre for Astrophysics, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
Liebig, C.; Astronomisches Rechen-Institut (ARI), Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstrasse 12-14, 69120 Heidelberg, Germany
Maier, G.; Astronomisches Rechen-Institut (ARI), Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstrasse 12-14, 69120 Heidelberg, Germany
Mancini, L.; Department of Physics, University of Salerno, Via Ponte Don Melillo, 84084 Fisciano (SA), Italy ; Max Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany
Mathiasen, M.; Niels Bohr Institutet, Københavns Universitet, Juliane Maries Vej 30, 2100 København Ø, Denmark
Penny, M. T.; Jodrell Bank Centre for Astrophysics, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
Proft, S.; Astronomisches Rechen-Institut (ARI), Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstrasse 12-14, 69120 Heidelberg, Germany
Rahvar, S.; Department of Physics, Sharif University of Technology, P.O. Box 11365-9161, Tehran, Iran ; Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario N2L 2Y5, Canada
Ricci, Davide ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
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