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Frank Grundahl

A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251

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  • N. Kains, European Southern Observatory
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  • R.A. Street, Las Cumbres Observatory Global Telescope Network
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  • Jeong-Heon Choi, Risø National Laboratory for Sustainable Energy, Denmark
  • C. Han, Chungbuk National University
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  • A. Udalski, Warsaw University Observatory
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  • L.A. Almeida, Instituto Nacional de Pesquisas Espeaciais
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  • F. Jablonski, Instituto Nacional de Pesquisas Espeaciais
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  • P.J. Tristram, Victoria University
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  • U.G. Jørgensen, University of Copenhagen
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  • M.K. Szymański, Warsaw University Observatory
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  • M. Kubiak, Warsaw University Observatory
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  • G. Pietrzyński, Warsaw University Observatory
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  • I. Soszyński, Warsaw University Observatory
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  • R. Poleski, Warsaw University Observatory
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  • S. Kozłowski, Warsaw University Observatory
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  • P. Pietrukowicz, Warsaw University Observatory
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  • K. Ulaczyk, Warsaw University Observatory
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  • Ł. Wyrzykowski, Warsaw University Observatory
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  • J. Skowron, Warsaw University Observatory
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  • K.A. Alsubai, Qatar Foundation
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  • V. Bozza, Università di Salerno
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  • P. Browne, University of St Andrews
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  • M.J. Burgdorf, Universität Stuttgart
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  • S. Calchi Novati, Università di Salerno
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  • P. Dodds, University of St Andrews
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  • M. Dominik, University of St Andrews
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  • S. Dreizler, Georg-August Universität
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  • X.-S. Fang, Chinese Academy of Sciences
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  • F. Grundahl
  • C.-H. Gu, Chinese Academy of Sciences
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  • S. Hardis, University of Copenhagen
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  • Kennet Bomann West Harpsøe, Niels Bohr Institutet - Afd., Denmark
  • F.V. Hessman, Georg-August Universität
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  • T.C. Hinse, University of Copenhagen
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  • Allan Hornstrup, IT-Department, Denmark
  • M. Hundertmark, University of St Andrews
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  • J. Jessen-Hansen
  • E. Kerins, University of Manchester
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  • C. Liebig, University of St Andrews
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  • Mikkel Nørup Lund
  • M. Lundkvist
  • L. Mancini, Max Planck Institute for Astronomy
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  • M. Mathiasen, University of Copenhagen, Denmark
  • M.T. Penny, University of Manchester
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  • S. Rahvar, Sharif University of Technology
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  • D. Ricci, Institut d'Astrophysique et de Géophysique
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  • K.C. Sahu, Space Telescope Science Institute
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  • G. Scarpetta, Università di Salerno
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  • Jesper Mirsa Skottfelt, Astrofysik og Planetforskning, Denmark
  • C. Snodgrass, Max Planck Institute for Solar System Research
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  • J. Southworth, Keele University
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  • J. Surdej, Institut d'Astrophysique et de Géophysique
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  • J. Tregloan-Reed, Keele University
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  • J. Wambsganss, Zentrum für Astronomie der Universität Heidelberg (ZAH)
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  • O. Wertz, Institut d'Astrophysique et de Géophysique
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  • D. Bajek, University of St Andrews
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  • D.M. Bramich, European Southern Observatory
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  • K. Horne, University of St Andrews
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  • S. Ipatov, Doha
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  • I.A. Steele, Twelve Quays House
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  • Y. Tsapras, Las Cumbres Observatory Global Telescope Network
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  • F. Abe, Nagoya University
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  • D.P. Bennett, University of Notre Dame
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  • I.A. Bond, North Shore Mail Centre
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  • C.S. Botzler, University of Auckland
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  • P. Chote, Victoria University
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  • M. Freeman, University of Auckland, United States
  • A. Fukui, National Astronomical Observatory of Japan
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  • K. Furusawa, Nagoya University
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  • Y. Itow, Nagoya University
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  • C.H. Ling, North Shore Mail Centre
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  • K. Masuda, Nagoya University
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  • Y. Matsubara, Nagoya University
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  • N. Miyake, Nagoya University
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  • Y. Muraki, Konan University
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  • K. Ohnishi, Nagano National College of Technology
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  • N. Rattenbury, University of Auckland
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  • T. Saito, Tokyo Metropolitan College of Industrial Technology
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  • D.J. Sullivan, Victoria University
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  • T. Sumi, Osaka University
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  • D. Suzuki, Osaka University
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  • K. Suzuki, Nagoya University
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  • W.L. Sweatman, North Shore Mail Centre
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  • S. Takino, Nagoya University
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  • K. Wada, Osaka University
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  • P.C.M. Yock, University of Auckland
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  • W. Allen, Vintage Lane Observatory
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  • V. Batista, Ohio State University
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  • S.-J. Chung, Korea Astronomy and Space Science Institute
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  • G. Christie, Auckland Observatory
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  • D.L. Depoy, Texas AandM University
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  • J. Drummond, Possum Observatory
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  • B.S. Gaudi, Ohio State University
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  • A. Gould, Ohio State University
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  • C. Henderson, Ohio State University
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  • Yoon-Suk Jung, Risø National Laboratory for Sustainable Energy, Denmark
  • J.-R. Koo, Korea Astronomy and Space Science Institute
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  • C.-U. Lee, Korea Astronomy and Space Science Institute, Denmark
  • J. McCormick, Centre for Backyard Astrophysics
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  • D. McGregor, Ohio State University
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  • J.A. Muñoz, Universidad de Valencia
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  • T. Natusch, Auckland Observatory
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  • H. Ngan, Auckland Observatory
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  • H. Park, Chungbuk National University
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  • R.W. Pogge, Ohio State University
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  • I.-G. Shin, Chungbuk National University
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  • Jung-Tay Yee, Center for Biological Sequence Analysis, Denmark
  • M.D. Albrow, Dept. of Physics and Astronomy
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  • E. Bachelet, IRAP
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  • J.-P. Beaulieu, Institut d'Astrophysique de Paris
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  • S. Brillant, European Southern Observatory (ESO)
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  • J.A.R. Caldwell, McDonald Observatory
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  • A. Cassan, Institut d'Astrophysique de Paris
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  • Anne Jodon Cole, Centre for Design, Learning & Innovation, Denmark
  • E. Corrales, Institut d'Astrophysique de Paris
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  • Ch. Coutures, Institut d'Astrophysique de Paris
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  • S. Dieters, IRAP
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  • D. Dominis Prester, University of Rijeka
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  • J. Donatowicz, Department of Computing
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  • P. Fouqué, IRAP
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  • J. Greenhill, University of Tasmania
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  • S.R. Kane, MS 100-22
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  • D. Kubas, European Southern Observatory (ESO)
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  • J.-B. Marquette, Institut d'Astrophysique de Paris
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  • R. Martin, Perth Observatory
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  • P. Meintjes, Dept. of Physics
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  • J. Menzies, South African Astronomical Observatory
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  • K.R. Pollard, Dept. of Physics and Astronomy
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  • A. Williams, Universität Heidelberg
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  • D. Wouters, Institut d'Astrophysique de Paris
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  • M. Zub, Zentrum für Astronomie der Universität Heidelberg (ZAH)
Aims. We present the analysis of the gravitational microlensing event OGLE-2011-BLG-0251. This anomalous event was observed by several survey and follow-up collaborations conducting microlensing observations towards the Galactic bulge. Methods. Based on detailed modelling of the observed light curve, we find that the lens is composed of two masses with a mass ratio q = 1.9 × 10. Thanks to our detection of higher-order effects on the light curve due to the Earth's orbital motion and the finite size of source, we are able to measure the mass and distance to the lens unambiguously. Results. We find that the lens is made up of a planet of mass 0.53 ± 0.21 M orbiting an M dwarf host star with a mass of 0.26 ± 0.11 M. The planetary system is located at a distance of 2.57 ± 0.61 kpc towards the Galactic centre. The projected separation of the planet from its host star is d = 1.408 ± 0.019, in units of the Einstein radius, which corresponds to 2.72 ± 0.75 AU in physical units. We also identified a competitive model with similar planet and host star masses, but with a smaller orbital radius of 1.50 ± 0.50 AU. The planet is therefore located beyond the snow line of its host star, which we estimate to be around ~1-1.5 AU.
Original languageEnglish
Article numberA70
JournalAstronomy & Astrophysics
Volume552
Number of pages10
ISSN0004-6361
DOIs
Publication statusPublished - 1 Jan 2013

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