Article (Scientific journals)
A New Type of Ambiguity in the Planet and Binary Interpretations of Central Perturbations of High-magnification Gravitational Microlensing Events
Choi, J.-Y.; Shin, I.-G.; Han, C. et al.
2012In Astrophysical Journal, 756, p. 48
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Keywords :
Galaxy: bulge; gravitational lensing: micro
Abstract :
[en] 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 χ[SUP]2[/SUP] 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 Δχ[SUP]2[/SUP] ~ 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.
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
Han, C.;  Department of Physics, Institute for Astrophysics, Chungbuk National University, Cheongju 371-763, Republic of Korea ; Author. ; The μFun Collaboration.
Udalski, A.;  Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland ; The OGLE Collaboration.
Sumi, T.;  Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan ; The MOA Collaboration.
Gould, A.;  Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ; The μFun Collaboration.
Bozza, V.;  Dipartimento di Fisica "E. R. Caianiello," Università degli Studi di Salerno, Via Ponte Don Melillo, I-84084 Fisciano (SA), Italy ; INFN, Gruppo Collegato di Salerno, Sezione di Napoli, Via S. Allende, I-84081 Baronissi (Salerno), Italy ; The MiNDSTEp Consortium.
Dominik, M.;  SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews KY16 9SS, UK ; The MiNDSTEp Consortium. ; Royal Society University Research Fellow.
Fouqué, P.;  IRAP, Université de Toulouse, CNRS, 14 Avenue Edouard Belin, F-31400 Toulouse, France ; The PLANET Collaboration.
Horne, K.;  SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews KY16 9SS, UK ; The RoboNet 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
Soszyński, I.;  Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
Pietrzyński, G.;  Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland ; Departamento de Astronomia, Universidad de Concepción, Casilla 160-C, Concepción, Chile
Poleski, R.;  Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
Ulaczyk, K.;  Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
Pietrukowicz, P.;  Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
Kozłowski, S.;  Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
Skowron, J.;  Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
Wyrzykowski, Ł.;  Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland ; Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
The OGLE Collaboration
Abe, F.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Bennett, D. P.;  Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556-5670, 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 92-019, Auckland 1001, New Zealand
Chote, P.;  School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 60, Wellington, New Zealand
Freeman, M.;  Department of Physics, University of Auckland, Private Bag 92-019, Auckland 1001, New Zealand
Fukui, A.;  Okayama Astrophysical Observatory, NAOJ, Okayama 719-0232, Japan
Furusawa, K.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Itow, Y.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Kobara, S.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Ling, C. H.;  Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
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.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Ohmori, K.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Ohnishi, K.;  Nagano National College of Technology, Nagano 381-8550, Japan
Rattenbury, N. J.;  Department of Physics, University of Auckland, Private Bag 92-019, Auckland 1001, New Zealand
Saito, To;  Tokyo Metropolitan College of Aeronautics, Tokyo 116-8523, Japan
Sullivan, D. J.;  School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 60, 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.;  School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 60, Wellington, 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 92-019, Auckland 1001, New Zealand
The MOA Collaboration
Bramich, D. M.;  European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany
Snodgrass, C.;  Max Planck Institute for Solar System Research, Max-Planck-Str. 2, D-37191 Katlenburg-Lindau, Germany
Steele, I. A.;  Astrophysics Research Institute, Liverpool John Moores University, Liverpool CH41 1LD, UK
Street, R. A.;  Las Cumbres Observatory Global Telescope Network, 6740B Cortona Drive, Goleta, CA 93117, USA
Tsapras, Y.;  Las Cumbres Observatory Global Telescope Network, 6740B Cortona Drive, Goleta, CA 93117, USA ; School of Physics and Astronomy, Queen Mary University of London, Mile End Road, London E1 4NS, UK
The RoboNet Collaboration
Alsubai, K. A.;  Qatar Foundation, P.O. Box 5825, Doha, Qatar
Browne, P.;  SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews KY16 9SS, UK
Burgdorf, M. J.;  Deutsches SOFIA Institut, Universität Stuttgart, Pfaffenwaldring 31, D-70569 Stuttgart, Germany ; SOFIA Science Center, NASA Ames Research Center, Mail Stop N211-3, Moffett Field CA 94035, USA
Calchi Novati, S.;  Dipartimento di Fisica "E. R. Caianiello," Università degli Studi di Salerno, Via Ponte Don Melillo, I-84084 Fisciano (SA), Italy ; Istituto Internazionale per gli Alti Studi Scientifici (IIASS), I-84019 Vietri Sul Mare (SA), Italy
Dodds, P.;  SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews KY16 9SS, UK
Dreizler, S.;  Institut für Astrophysik, Georg-August-Universität, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
Fang, X.-S.;  National Astronomical Observatories/Yunnan Observatory, Joint laboratory for Optical Astronomy, Chinese Academy of Sciences, Kunming 650011, China
Grundahl, F.;  Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Århus C, Denmark
Gu, C.-H.;  National Astronomical Observatories/Yunnan Observatory, Joint laboratory for Optical Astronomy, Chinese Academy of Sciences, Kunming 650011, China
Hardis, S.;  Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark
Harpsøe, K.;  Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark ; Centre for Star and Planet Formation, Geological Museum, Øster Voldgade 5, DK-1350 Copenhagen, Denmark
Hinse, T. C.;  Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark ; Armagh Observatory, College Hill, Armagh BT61 9DG, UK ; Korea Astronomy and Space Science Institute, 776 Daedukdae-ro, Yuseong-gu, Daejeon 305-348, Republic of Korea
Hornstrup, A.;  Danmarks Tekniske Universitet, Institut for Rumforskning og-teknologi, Juliane Maries Vej 30, DK-2100 København, Denmark
Hundertmark, M.;  SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews KY16 9SS, UK ; Institut für Astrophysik, Georg-August-Universität, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
Jessen-Hansen, J.;  Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Århus C, Denmark
Jørgensen, U. G.;  Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark ; Centre for Star and Planet Formation, Geological Museum, Øster Voldgade 5, DK-1350 Copenhagen, Denmark
Kains, N.;  ESO Headquarters, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany
Kerins, E.;  Jodrell Bank Centre for Astrophysics, University of Manchester, Oxford Road, Manchester M13 9PL, UK
Liebig, C.;  SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews KY16 9SS, UK
Lund, M.;  Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Århus C, Denmark
Lunkkvist, M.;  Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Århus C, Denmark
Mancini, L.;  Max Planck Institute for Astronomy, KÄonigstuhl 17, D-69117 Heidelberg, Germany ; International Institute for Advanced Scientific Studies, I-84019 Vietri Sul Mare (SA), Italy
Mathiasen, M.;  Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark
Penny, M. T.;  Jodrell Bank Centre for Astrophysics, University of Manchester, Oxford Road, Manchester M13 9PL, UK ; Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
Rahvar, S.;  Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran ; Perimeter Institue for Theoretical Physics, 31 Caroline Street North, Waterloo, ON N2L2Y5, Canada
Ricci, Davide ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Scarpetta, G.;  Dipartimento di Fisica "E. R. Caianiello," Università degli Studi di Salerno, Via Ponte Don Melillo, I-84084 Fisciano (SA), Italy ; Istituto Internazionale per gli Alti Studi Scientifici (IIASS), I-84019 Vietri Sul Mare (SA), Italy ; INFN, Gruppo Collegato di Salerno, Sezione di Napoli, Via S. Allende, I-84081 Baronissi (Salerno), Italy
Skottfelt, J.;  Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark
Southworth, J.;  Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Tregloan-Reed, J.;  Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK
Wambsganss, J.;  Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstr. 12-14, D-69120 Heidelberg, Germany
Wertz, Olivier ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
MiNDSTEp Consortium, The
Almeida, L. A.;  Instituto Nacional de Pesquisas Espaciais, São José dos Campos, SP, Brazil
Batista, V.;  Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
Christie, G.;  Auckland Observatory, Auckland, New Zealand
DePoy, D. L.;  Department of Physics, Texas A&M University, College Station, TX 77843, USA
Dong, Subo;  Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540, USA
Gaudi, B. S.;  Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
Henderson, C.;  Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
Jablonski, F.;  Instituto Nacional de Pesquisas Espaciais, São José dos Campos, SP, Brazil
Lee, C.-U.;  Korea Astronomy and Space Science Institute, 776 Daedukdae-ro, Yuseong-gu, Daejeon 305-348, Republic of Korea
McCormick, J.;  Farm Cove Observatory, Centre for Backyard Astrophysics, Pakuranga, Auckland, New Zealand
McGregor, D.;  Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
Moorhouse, D.;  Kumeu Observatory, Kumeu, New Zealand
Natusch, T.;  Auckland Observatory, Auckland, New Zealand ; Institute for Radiophysics and Space Research, AUT University, Auckland, New Zealand
Ngan, H.;  Auckland Observatory, Auckland, New Zealand
Pogge, R. W.;  Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
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 West 18th Avenue, Columbus, OH 43210, USA
The μFUN Collaboration
Albrow, M. D.;  Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand
Bachelet, E.;  IRAP, Université de Toulouse, CNRS, 14 Avenue Edouard Belin, F-31400 Toulouse, France
Beaulieu, J.-P.;  UPMC-CNRS, UMR 7095, Institut d'Astrophysique de Paris, 98bis Boulevard Arago, F-75014 Paris, France
Brillant, S.;  European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile
Cassan, A.;  UPMC-CNRS, UMR 7095, Institut d'Astrophysique de Paris, 98bis Boulevard Arago, F-75014 Paris, France
Cole, A. A.;  School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, TAS 7001, Australia
Corrales, E.;  UPMC-CNRS, UMR 7095, Institut d'Astrophysique de Paris, 98bis Boulevard Arago, F-75014 Paris, France
Coutures, C.;  UPMC-CNRS, UMR 7095, Institut d'Astrophysique de Paris, 98bis Boulevard Arago, F-75014 Paris, France
Dieters, S.;  School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, TAS 7001, Australia
Dominis Prester, D.;  Department of Physics, University of Rijeka, Omladinska 14, 51000 Rijeka, Croatia
Donatowicz, J.;  Department of Computing, Technische Universität Wien, Wieder Hauptst. 8-10, A-1040 Vienna, Austria
Greenhill, J.;  School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, TAS 7001, Australia
Kubas, D.;  European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile ; UPMC-CNRS, UMR 7095, Institut d'Astrophysique de Paris, 98bis Boulevard Arago, F-75014 Paris, France
Marquette, J.-B.;  UPMC-CNRS, UMR 7095, Institut d'Astrophysique de Paris, 98bis Boulevard Arago, F-75014 Paris, France
Menzies, J. W.;  South African Astronomical Observatory, P.O. Box 9 Observatory 7925, South Africa
Sahu, K. C.;  Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Zub, M.;  Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstr. 12-14, D-69120 Heidelberg, Germany
The PLANET Collaboration;  )
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Language :
English
Title :
A New Type of Ambiguity in the Planet and Binary Interpretations of Central Perturbations of High-magnification Gravitational Microlensing Events
Publication date :
01 September 2012
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
University of Chicago Press, Chicago, United States - Illinois
Volume :
756
Pages :
48
Peer reviewed :
Peer Reviewed verified by ORBi
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