• Author: Choi, J.-Y

    Dept. of Phys., Chungbuk Nat. Univ., Cheongju, Chungbuk National University, Department of Physics, Cheongju 371-763 South Korea

  • Author: Shin, I.-G

    Dept. of Phys., Chungbuk Nat. Univ., Cheongju, Chungbuk National University, Department of Physics, Cheongju 371-763 South Korea

  • Author: Han, C.

    Dept. of Phys., Chungbuk Nat. Univ., Cheongju, Chungbuk National University, Department of Physics, Cheongju 371-763 South Korea

  • Author: Udalski, A.

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

  • Author: Sumi, T.

    Dept. of Earth & Space Sci., Osaka Univ., Toyonaka, Osaka University, Department of Earth and Space Science, Toyonaka 560-0043 Japan

  • Author: Gould, A.

    Dept. of Astron., Ohio State Univ., Columbus, OH, Ohio State University, Department of Astronomy 140 West 18th Avenue, Columbus OH 43210 USA

  • Author: Bozza, V.

    Università degli Studi di Salerno

  • Author: Dominik, M.

    Sch. of Phys. & Astron., Univ. of St. Andrews, St. Andrews, University of St Andrews, School of Physics & Astronomy North Haugh, St. Andrews KY16 9SS UK

  • Author: Fouque´, P.

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

  • Author: Horne, K.

    Sch. of Phys. & Astron., Univ. of St. Andrews, St. Andrews, University of St Andrews, School of Physics & Astronomy North Haugh, St. Andrews KY16 9SS UK

  • 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.

    Dept. of Astron., Ohio State Univ., Columbus, OH, Ohio State University, Department of Astronomy 140 West 18th Avenue, Columbus OH 43210 USA

  • Author: Wyrzykowski, Ł.

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

  • Author: OGLE Collaboration

    ,

    Dept. of Phys., Chungbuk Nat. Univ., Cheongju, Chungbuk National University, Department of Physics, Cheongju 371-763 South Korea

  • Author: Abe, F.

    Solar-Terrestrial Environ. Lab., Nagoya Univ., Nagoya, Nagoya University, Solar-Terrestrial Environment Laboratory, Nagoya 464-8601 Japan

  • 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.

    Solar-Terrestrial Environ. Lab., Nagoya Univ., Nagoya, Nagoya University, Solar-Terrestrial Environment Laboratory, Nagoya 464-8601 Japan

  • Author: Itow, Y.

    Solar-Terrestrial Environ. Lab., Nagoya Univ., Nagoya, Nagoya University, Solar-Terrestrial Environment Laboratory, Nagoya 464-8601 Japan

  • Author: Kobara, S.

    Solar-Terrestrial Environ. Lab., Nagoya Univ., Nagoya, Nagoya University, Solar-Terrestrial Environment Laboratory, Nagoya 464-8601 Japan

  • Author: Ling, C. H.

    Massey University

  • Author: Masuda, K.

    Solar-Terrestrial Environ. Lab., Nagoya Univ., Nagoya, Nagoya University, Solar-Terrestrial Environment Laboratory, Nagoya 464-8601 Japan

  • Author: Matsubara, Y.

    Solar-Terrestrial Environ. Lab., Nagoya Univ., Nagoya, Nagoya University, Solar-Terrestrial Environment Laboratory, Nagoya 464-8601 Japan

  • Author: Miyake, N.

    Solar-Terrestrial Environ. Lab., Nagoya Univ., Nagoya, Nagoya University, Solar-Terrestrial Environment Laboratory, Nagoya 464-8601 Japan

  • Author: Muraki, Y.

    Solar-Terrestrial Environ. Lab., Nagoya Univ., Nagoya, Nagoya University, Solar-Terrestrial Environment Laboratory, Nagoya 464-8601 Japan

  • Author: Ohmori, K.

    Solar-Terrestrial Environ. Lab., Nagoya Univ., Nagoya, Nagoya University, Solar-Terrestrial Environment Laboratory, Nagoya 464-8601 Japan

  • 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.

    Dept. of Earth & Space Sci., Osaka Univ., Toyonaka, Osaka University, Department of Earth and Space Science, Toyonaka 560-0043 Japan

  • Author: Suzuki, K.

    Solar-Terrestrial Environ. Lab., Nagoya Univ., Nagoya, Nagoya University, Solar-Terrestrial Environment Laboratory, Nagoya 464-8601 Japan

  • Author: Sweatman, W. L.

    Massey University

  • Author: Takino, S.

    Solar-Terrestrial Environ. Lab., Nagoya Univ., Nagoya, Nagoya University, Solar-Terrestrial Environment Laboratory, Nagoya 464-8601 Japan

  • Author: Tristram, P. J.

    Victoria University of Wellington

  • Author: Wada, K.

    Dept. of Earth & Space Sci., Osaka Univ., Toyonaka, Osaka University, Department of Earth and Space Science, Toyonaka 560-0043 Japan

  • Author: Yock, P. C. M.

    University of Auckland

  • Author: MOA Collaboration

    ,

    Dept. of Phys., Chungbuk Nat. Univ., Cheongju, Chungbuk National University, Department of Physics, Cheongju 371-763 South Korea

  • Author: Bramich, D. M.

    Eur. Southern Obs., Garching, European Southern Observatory Karl-Schwarzschild-Str. 2, Garching D-85748 Germany

  • 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

    ,

    Dept. of Phys., Chungbuk Nat. Univ., Cheongju, Chungbuk National University, Department of Physics, Cheongju 371-763 South Korea

  • Author: Alsubai, K. A.

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

  • Author: Browne, P.

    Sch. of Phys. & Astron., Univ. of St. Andrews, St. Andrews, University of St Andrews, School of Physics & Astronomy North Haugh, St. Andrews KY16 9SS UK

  • 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.

    Sch. of Phys. & Astron., Univ. of St. Andrews, St. Andrews, University of St Andrews, School of Physics & Astronomy North Haugh, St. Andrews KY16 9SS UK

  • 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.

    Sch. of Phys. & Astron., Univ. of St. Andrews, St. Andrews, University of St Andrews, School of Physics & Astronomy North Haugh, St. Andrews KY16 9SS UK

  • 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.

    Sch. of Phys. & Astron., Univ. of St. Andrews, St. Andrews, University of St Andrews, School of Physics & Astronomy North Haugh, St. Andrews KY16 9SS UK

  • 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.

    Dept. of Phys., Sharif Univ. of Technol., Tehran, Sharif University of Technology, Department of Physics P.O. Box 11155-9161, Tehran Iran

  • 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.

    Astrophys. Group, Keele Univ., Keele, Keele University, Astrophysics Group, Keele ST5 5BG UK

  • 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.

    Astrophys. Group, Keele Univ., Keele, Keele University, Astrophysics Group, Keele ST5 5BG UK

  • Author: Wambsganss, J.

    Astron. Rechen-Inst., Zentrum fur Astron. der Univ. Heidelberg (ZAH), Heidelberg, Zentrum fu¨r Astronomie der Universita¨t Heidelberg (ZAH), Astronomisches Rechen-Institut Mo¨nchhofstr. 12-14, Heidelberg D-69120 Germany

  • 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.

    Dept. of Astron., Ohio State Univ., Columbus, OH, Ohio State University, Department of Astronomy 140 West 18th Avenue, Columbus OH 43210 USA

  • Author: Christie, G.

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

  • Author: DePoy, D. L.

    Dept. of Phys., Texas A&M Univ., College Station, TX, Texas A&M University, Department of Physics, College Station TX 77843 USA

  • Author: Dong, Subo

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

  • Author: Gaudi, B. S.

    Dept. of Astron., Ohio State Univ., Columbus, OH, Ohio State University, Department of Astronomy 140 West 18th Avenue, Columbus OH 43210 USA

  • Author: Henderson, C.

    Dept. of Astron., Ohio State Univ., Columbus, OH, Ohio State University, Department of Astronomy 140 West 18th Avenue, Columbus OH 43210 USA

  • 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.

    Dept. of Astron., Ohio State Univ., Columbus, OH, Ohio State University, Department of Astronomy 140 West 18th Avenue, Columbus OH 43210 USA

  • 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.

    Dept. of Astron., Ohio State Univ., Columbus, OH, Ohio State University, Department of Astronomy 140 West 18th Avenue, Columbus OH 43210 USA

  • 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.

    Dept. of Astron., Ohio State Univ., Columbus, OH, Ohio State University, Department of Astronomy 140 West 18th Avenue, Columbus OH 43210 USA

  • 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.

    Eur. Southern Obs., Santiago, European Southern Observatory Vitacura 19 Casilla, Santiago 19001 Chile

  • 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.

    Sch. of Math. & Phys., Univ. of Tasmania, Hobart, TAS, University of Tasmania, School of Mathematics and Physics Private Bag 37, Hobart TAS 7001 Australia

  • 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.

    Sch. of Math. & Phys., Univ. of Tasmania, Hobart, TAS, University of Tasmania, School of Mathematics and Physics Private Bag 37, Hobart TAS 7001 Australia

  • Author: Dominis Prester, D.

    Dept. of Phys., Univ. of Rijeka, Rijeka, University of Rijeka, Department of Physics Omladinska 14, Rijeka 51000 Croatia

  • Author: Donatowicz, J.

    Technische Universität Wien

  • Author: Greenhill, J.

    Sch. of Math. & Phys., Univ. of Tasmania, Hobart, TAS, University of Tasmania, School of Mathematics and Physics Private Bag 37, Hobart TAS 7001 Australia

  • Author: Kubas, D.

    Eur. Southern Obs., Santiago, European Southern Observatory Vitacura 19 Casilla, Santiago 19001 Chile

  • 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.

    Astron. Rechen-Inst., Zentrum fur Astron. der Univ. Heidelberg (ZAH), Heidelberg, Zentrum fu¨r Astronomie der Universita¨t Heidelberg (ZAH), Astronomisches Rechen-Institut Mo¨nchhofstr. 12-14, Heidelberg D-69120 Germany

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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: 4
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