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    Chungbuk National University

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    Chungbuk National University

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    Chungbuk National University

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    University of Warsaw

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    Osaka University

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    Ohio State University

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    Università degli Studi di Salerno

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    University of St Andrews

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    Université de Toulouse

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    University of St Andrews

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    University of Warsaw

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    University of Warsaw

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    University of Warsaw

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    University of Warsaw

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    University of Warsaw

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    University of Warsaw

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    University of Warsaw

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    University of Warsaw

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    Ohio State University

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    University of Warsaw

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    Chungbuk National University

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    Nagoya University

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    University of Notre Dame

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    Massey University

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    University of Auckland

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    Victoria University of Wellington

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    University of Auckland

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    Okayama Astrophys. Obs., NAOJ, Okayama, NAOJ, Okayama Astrophysical Observatory, Okayama 719-0232 Japan

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    Nagoya University

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    Nagoya University

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    Nagoya University

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    Massey University

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    Nagoya University

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    Nagoya University

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    Nagoya University

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    Nagoya University

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    Nagoya University

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    Nagano National College of Technology

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    University of Auckland

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    Tokyo Metropolitan College of Industrial Technology

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    Victoria University of Wellington

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    Osaka University

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    Nagoya University

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    Massey University

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    Nagoya University

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    Victoria University of Wellington

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    Osaka University

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    University of Auckland

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    Chungbuk National University

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    European Southern Observatory

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    Max Planck Institute

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    Liverpool John Moores University

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    Las Cumbres Obs. Global Telescope Network, Goleta, CA, Las Cumbres Observatory Global Telescope Network 6740B Cortona Drive, Goleta CA 93117 USA

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    Las Cumbres Obs. Global Telescope Network, Goleta, CA, Las Cumbres Observatory Global Telescope Network 6740B Cortona Drive, Goleta CA 93117 USA

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    Chungbuk National University

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    Qatar Found., Doha, Qatar Foundation P.O. Box 5825, Doha Qatar

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    University of St Andrews

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    Universität Stuttgart

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    Università degli Studi di Salerno

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    University of St Andrews

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    Inst. fur Astrophys., Georg-August-Univ., Go¨ttingen, Georg-August-Universita¨t, Institut fu¨r Astrophysik Friedrich-Hund-Platz 1, Go¨ttingen D-37077 Germany

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    Joint Lab. for Opt. Astron., Nat. Astron. Obs./Yunnan Obs., Kunming, National Astronomical Observatories/Yunnan Observatory, Joint Laboratory for Optical Astronomy, Kunming 650011 China

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    Aarhus University

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    Joint Lab. for Opt. Astron., Nat. Astron. Obs./Yunnan Obs., Kunming, National Astronomical Observatories/Yunnan Observatory, Joint Laboratory for Optical Astronomy, Kunming 650011 China

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    University of Copenhagen

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    University of Copenhagen

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    University of Copenhagen

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

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    University of St Andrews

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    Aarhus University

  • Author: Jørgensen, U. G.

    University of Copenhagen

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    ESO Headquarters, Garching, ESO Headquarters Karl-Schwarzschild-Str. 2, Garching D-85748 Germany

  • Author: Kerins, E.

    University of Manchester

  • Author: Liebig, C.

    University of St Andrews

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    Aarhus University

  • Author: Lunkkvist, M.

    Aarhus University

  • Author: Mancini, L.

    Max Planck Institute

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    University of Copenhagen

  • Author: Penny, M. T.

    University of Manchester

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    Sharif University of Technology

  • Author: Ricci, D.

    Inst. d'Astrophys. et de Geophys., Liege, Institut d'Astrophysique et de Ge´ophysique Alle´e du 6 Aou^t 17 Sart Tilman Ba^t. B5c, Liege B-4000 Belgium

  • Author: Scarpetta, G.

    Università degli Studi di Salerno

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    University of Copenhagen

  • Author: Southworth, J.

    Keele University

  • Author: Surdej, J.

    Inst. d'Astrophys. et de Geophys., Liege, Institut d'Astrophysique et de Ge´ophysique Alle´e du 6 Aou^t 17 Sart Tilman Ba^t. B5c, Liege B-4000 Belgium

  • Author: Tregloan-Reed, J.

    Keele University

  • Author: Wambsganss, J.

    Heidelberg University

  • Author: Wertz, O.

    Inst. d'Astrophys. et de Geophys., Liege, Institut d'Astrophysique et de Ge´ophysique Alle´e du 6 Aou^t 17 Sart Tilman Ba^t. B5c, Liege B-4000 Belgium

  • Author: Almeida, L. A.

    Inst. Nac. de Pesquisas Espaciais, Sa˜o Jose´ dos Campos, Instituto Nacional de Pesquisas Espaciais SP, Sa˜o Jose´ dos Campos Brazil

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    Ohio State University

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    Auckland Observatory

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    Texas A&M University

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    Inst. for Adv. Study, Princeton, NJ, Institute for Advanced Study Einstein Drive, Princeton NJ 08540 USA

  • Author: Gaudi, B. S.

    Ohio State University

  • Author: Henderson, C.

    Ohio State University

  • Author: Jablonski, F.

    Inst. Nac. de Pesquisas Espaciais, Sa˜o Jose´ dos Campos, Instituto Nacional de Pesquisas Espaciais SP, Sa˜o Jose´ dos Campos Brazil

  • Author: Lee, C.-U

    Korea Astron. & Space Sci. Inst., Daejeon, Korea Astronomy and Space Science Institute Yuseong-gu, Daejeon 305-348 South Korea

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    Farm Cove Obs., Centre for Backyard Astrophys., Auckland, Centre for Backyard Astrophysics, Farm Cove Observatory Pakuranga, Auckland New Zealand

  • Author: McGregor, D.

    Ohio State University

  • Author: Moorhouse, D.

    Kumeu Obs., Kumeu, Kumeu Observatory, Kumeu New Zealand

  • Author: Natusch, T.

    Auckland Observatory

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    Auckland Observatory

  • Author: Pogge, R. W.

    Ohio State University

  • Author: Tan, T.-G

    Perth Exoplanet Survey Telescope, Perth, WA, Perth Exoplanet Survey Telescope, Perth WA Australia

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    Kumeu Obs., Kumeu, Kumeu Observatory, Kumeu New Zealand

  • Author: Yee, J. C.

    Ohio State University

  • Author: Albrow, M. D.

    University of Canterbury

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    Université de Toulouse

  • Author: Beaulieu, J.-P

    Université Pierre-et-Marie-Curie - Université Paris VI

  • Author: Brillant, S.

    European Southern Observatory

  • Author: Cassan, A.

    Université Pierre-et-Marie-Curie - Université Paris VI

  • Author: Cole, A. A.

    University of Tasmania

  • Author: Corrales, E.

    Université Pierre-et-Marie-Curie - Université Paris VI

  • Author: Coutures, C.

    Université Pierre-et-Marie-Curie - Université Paris VI

  • Author: Dieters, S.

    University of Tasmania

  • Author: Dominis Prester, D.

    University of Rijeka

  • Author: Donatowicz, J.

    Technische Universität Wien

  • Author: Greenhill, J.

    University of Tasmania

  • Author: Kubas, D.

    European Southern Observatory

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    Université Pierre-et-Marie-Curie - Université Paris VI

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    South African Astron. Obs., South African Astronomical Observatory P.O. Box 9 Observatory South Africa

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    Space Telescope Sci. Inst., Baltimore, MD, Space Telescope Science Institute 3700 San Martin Drive, Baltimore MD 21218 USA

  • Author: Zub, M.

    Heidelberg University

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High-magnification microlensing events provide an important channel to detect planets. Perturbations near the peak of a high-magnification event can be produced either by a planet or a binary companion. It is known that central perturbations induced by both types of companions can be generally distinguished due to the essentially different magnification pattern around caustics. In this paper, we present a case of central perturbations for which it is difficult to distinguish the planetary and binary interpretations. The peak of a lensing light curve affected by this perturbation appears to be blunt and flat. For a planetary case, this perturbation occurs when the source trajectory passes the negative perturbation region behind the back end of an arrowhead-shaped central caustic. For a binary case, a similar perturbation occurs for a source trajectory passing through the negative perturbation region between two cusps of an astroid-shaped caustic. We demonstrate the degeneracy for two high-magnification events of OGLE-2011-BLG-0526 and OGLE-2011-BLG-0950/MOA-2011-BLG-336. For OGLE-2011-BLG-0526, the χ2 difference between the planetary and binary model is ~3, implying that the degeneracy is very severe. For OGLE-2011-BLG-0950/MOA-2011-BLG-336, the stellar binary model is formally excluded with Δχ2 ~ 105 and the planetary model is preferred. However, it is difficult to claim a planet discovery because systematic residuals of data from the planetary model are larger than the difference between the planetary and binary models. Considering that two events observed during a single season suffer from such a degeneracy, it is expected that central perturbations experiencing this type of degeneracy is common.
Original languageEnglish
JournalAstrophysical Journal
Publication date2012
Volume756
Issue1
Pages48
Number of pages9
ISSN0004-637X
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 5
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