• Author: Choi, J.-Y

    Chungbuk National University

  • Author: Shin, I.-G

    Chungbuk National University

  • Author: Han, C.

    Chungbuk National University

  • Author: Udalski, A.

    Warsaw Univ. Obs., Warsaw, Warsaw University Observatory Al. Ujazdowskie 4, Warsaw 00-478 Poland

  • Author: Sumi, T.

    Osaka University

  • Author: Gould, A.

    Ohio State University

  • Author: Bozza, V.

    Università degli Studi di Salerno

  • Author: Dominik, M.

    University of St Andrews

  • Author: Fouque´, P.

    IRAP, Univ. de Toulouse, Toulouse, Universite´ de Toulouse, IRAP 14 Avenue Edouard Belin, Toulouse F-31400 France

  • Author: Horne, K.

    University of St Andrews

  • Author: Szyman´ski, M. K.

    Warsaw Univ. Obs., Warsaw, Warsaw University Observatory Al. Ujazdowskie 4, Warsaw 00-478 Poland

  • Author: Kubiak, M.

    Warsaw Univ. Obs., Warsaw, Warsaw University Observatory Al. Ujazdowskie 4, Warsaw 00-478 Poland

  • Author: Soszyn´ski, I.

    Warsaw Univ. Obs., Warsaw, Warsaw University Observatory Al. Ujazdowskie 4, Warsaw 00-478 Poland

  • Author: Pietrzyn´ski, G.

    Warsaw Univ. Obs., Warsaw, Warsaw University Observatory Al. Ujazdowskie 4, Warsaw 00-478 Poland

  • Author: Poleski, R.

    Warsaw Univ. Obs., Warsaw, Warsaw University Observatory Al. Ujazdowskie 4, Warsaw 00-478 Poland

  • Author: Ulaczyk, K.

    Warsaw Univ. Obs., Warsaw, Warsaw University Observatory Al. Ujazdowskie 4, Warsaw 00-478 Poland

  • Author: Pietrukowicz, P.

    Warsaw Univ. Obs., Warsaw, Warsaw University Observatory Al. Ujazdowskie 4, Warsaw 00-478 Poland

  • Author: Kozłowski, S.

    Warsaw Univ. Obs., Warsaw, Warsaw University Observatory Al. Ujazdowskie 4, Warsaw 00-478 Poland

  • Author: Skowron, J.

    Ohio State University

  • Author: Wyrzykowski, Ł.

    Warsaw Univ. Obs., Warsaw, Warsaw University Observatory Al. Ujazdowskie 4, Warsaw 00-478 Poland

  • Author: OGLE Collaboration

    ,

    Chungbuk National University

  • Author: Abe, F.

    Nagoya University

  • Author: Bennett, D. P.

    Dept. of Phys., Univ. of Notre Dame, Notre Dame, IN, University of Notre Dame, Department of Physics 225 Nieuwland Science Hall, Notre Dame IN 46556-5670 USA

  • Author: Bond, I. A.

    Massey University

  • Author: Botzler, C. S.

    University of Auckland

  • Author: Chote, P.

    Victoria University of Wellington

  • Author: Freeman, M.

    University of Auckland

  • Author: Fukui, A.

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

  • Author: Furusawa, K.

    Nagoya University

  • Author: Itow, Y.

    Nagoya University

  • Author: Kobara, S.

    Nagoya University

  • Author: Ling, C. H.

    Massey University

  • Author: Masuda, K.

    Nagoya University

  • Author: Matsubara, Y.

    Nagoya University

  • Author: Miyake, N.

    Nagoya University

  • Author: Muraki, Y.

    Nagoya University

  • Author: Ohmori, K.

    Nagoya University

  • Author: Ohnishi, K.

    Nagano Nat. Coll. of Technol., Nagano, Nagano National College of Technology, Nagano 381-8550 Japan

  • Author: Rattenbury, N. J.

    University of Auckland

  • Author: Saito, To

    Tokyo Metropolitan Coll. of Aeronaut., Tokyo, Tokyo Metropolitan College of Aeronautics, Tokyo 116-8523 Japan

  • Author: Sullivan, D. J.

    Victoria University of Wellington

  • Author: Suzuki, D.

    Osaka University

  • Author: Suzuki, K.

    Nagoya University

  • Author: Sweatman, W. L.

    Massey University

  • Author: Takino, S.

    Nagoya University

  • Author: Tristram, P. J.

    Victoria University of Wellington

  • Author: Wada, K.

    Osaka University

  • Author: Yock, P. C. M.

    University of Auckland

  • Author: MOA Collaboration

    ,

    Chungbuk National University

  • Author: Bramich, D. M.

    European Southern Observatory

  • Author: Snodgrass, C.

    Max Planck Institute

  • Author: Steele, I. A.

    Astrophys. Res. Inst., Liverpool John Moores Univ., Liverpool, Liverpool John Moores University, Astrophysics Research Institute, Liverpool CH41 1LD UK

  • Author: Street, R. A.

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

  • Author: Tsapras, Y.

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

  • Author: RoboNet Collaboration

    ,

    Chungbuk National University

  • Author: Alsubai, K. A.

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

  • Author: Browne, P.

    University of St Andrews

  • Author: Burgdorf, M. J.

    Deutsches SOFIA Inst., Univ. Stuttgart, Stuttgart, Universita¨t Stuttgart, Deutsches SOFIA Institut Pfaffenwaldring 31, Stuttgart D-70569 Germany

  • Author: Calchi Novati, S.

    Università degli Studi di Salerno

  • Author: Dodds, P.

    University of St Andrews

  • Author: Dreizler, S.

    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

  • Author: Fang, X.-S

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

  • Author: Grundahl, F.

    Aarhus University

  • Author: Gu, C.-H

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

  • Author: Hardis, S.

    University of Copenhagen

  • Author: Harpsøe, K.

    University of Copenhagen

  • Author: Hinse, T. C.

    University of Copenhagen

  • Author: Hornstrup, Allan

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

  • Author: Hundertmark, M.

    University of St Andrews

  • Author: Jessen-Hansen, J.

    Aarhus University

  • Author: Jørgensen, U. G.

    University of Copenhagen

  • Author: Kains, N.

    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

  • Author: Lund, M.

    Aarhus University

  • Author: Lunkkvist, M.

    Aarhus University

  • Author: Mancini, L.

    Max Planck Institute

  • Author: Mathiasen, M.

    University of Copenhagen

  • Author: Penny, M. T.

    University of Manchester

  • Author: Rahvar, S.

    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

  • Author: Skottfelt, J.

    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

  • Author: Batista, V.

    Ohio State University

  • Author: Christie, G.

    Auckland Obs., Auckland, Auckland Observatory, Auckland New Zealand

  • Author: DePoy, D. L.

    Texas A&M University

  • Author: Dong, Subo

    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

  • Author: McCormick, J.

    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 Obs., Auckland, Auckland Observatory, Auckland New Zealand

  • Author: Ngan, H.

    Auckland Obs., Auckland, Auckland Observatory, Auckland New Zealand

  • Author: Pogge, R. W.

    Ohio State University

  • Author: Tan, T.-G

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

  • Author: Thornley, G.

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

  • Author: Yee, J. C.

    Ohio State University

  • Author: Albrow, M. D.

    University of Canterbury

  • Author: Bachelet, E.

    IRAP, Univ. de Toulouse, Toulouse, Universite´ de Toulouse, IRAP 14 Avenue Edouard Belin, Toulouse F-31400 France

  • Author: Beaulieu, J.-P

    Inst. d'Astrophys. de Paris, UPMC, Paris, UPMC, Institut d'Astrophysique de Paris UMR 7095 98bis Boulevard Arago, Paris F-75014 France

  • Author: Brillant, S.

    European Southern Observatory

  • Author: Cassan, A.

    Inst. d'Astrophys. de Paris, UPMC, Paris, UPMC, Institut d'Astrophysique de Paris UMR 7095 98bis Boulevard Arago, Paris F-75014 France

  • Author: Cole, A. A.

    University of Tasmania

  • Author: Corrales, E.

    Inst. d'Astrophys. de Paris, UPMC, Paris, UPMC, Institut d'Astrophysique de Paris UMR 7095 98bis Boulevard Arago, Paris F-75014 France

  • Author: Coutures, C.

    Inst. d'Astrophys. de Paris, UPMC, Paris, UPMC, Institut d'Astrophysique de Paris UMR 7095 98bis Boulevard Arago, Paris F-75014 France

  • 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

  • Author: Marquette, J.-B

    Inst. d'Astrophys. de Paris, UPMC, Paris, UPMC, Institut d'Astrophysique de Paris UMR 7095 98bis Boulevard Arago, Paris F-75014 France

  • Author: Menzies, J. W.

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

  • Author: Sahu, K. C.

    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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