Interpretation of Strong Short-Term Central Perturbations in the Light Curves of Moderate-Magnification Microlensing Events

doi:10.1088/0004-637X/705/2/1116

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C. Han et al. 2009 ApJ 705 1116 doi:10.1088/0004-637X/705/2/1116

INTERPRETATION OF STRONG SHORT-TERM CENTRAL PERTURBATIONS IN THE LIGHT CURVES OF MODERATE-MAGNIFICATION MICROLENSING EVENTS

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C. Han^1,42, K.-H. Hwang¹, D. Kim¹, A. Udalski^2,43, F. Abe^3,44, L. A. B. Monard^4,42, J. McCormick^5,42, M. K. Szymański², M. Kubiak², G. Pietrzyński^2,6, I. Soszyński², O. Szewczyk⁶, Ł. Wyrzykowski⁷, K. Ulaczyk² (The OGLE Collaboration), I. A. Bond⁸, C. S. Botzler⁹, A. Fukui³, K. Furusawa³, J. B. Hearnshaw¹⁰, Y. Itow³, K. Kamiya³, P. M. Kilmartin¹¹, A. Korpela¹², W. Lin⁸, C. H. Ling⁸, K. Masuda³, Y. Matsubara³, N. Miyake³, Y. Muraki¹³, M. Nagaya³, K. Ohnishi¹⁴, T. Tokumura³, Y. C. Perrott⁹, N. Rattenbury¹⁵, To. Saito¹⁶, T. Sako³, L. Skuljan⁸, D. S. Sullivan¹², T. Sumi³, W. L. Sweatman⁸, P. J. Tristram¹¹, P. C. M. Yock⁹ (The MOA Collaboration), W. Allen¹⁷, G. W. Christie¹⁸, D. L. DePoy¹⁹, S. Dong²⁰, B. S. Gaudi²⁰, A. Gould²⁰, C.-U. Lee²¹, T. Natusch²², B.-G. Park²¹, R. W. Pogge²⁰ (The μFUN Collaboration), M. D. Albrow¹⁰, A. Allan²³, V. Batista²⁴, J. P. Beaulieu²⁴, D. P. Bennett²⁵, S. Brillant²⁶, M. Bode²⁷, D. M. Bramich²⁸, M. Burgdorf²⁷, J. A. R. Caldwell²⁹, H. Calitz³⁰, A. Cassan³¹, E. Corrales²⁴, S. Dieters^24,32, D. D. Prester³³, M. Dominik³⁴, J. Donatowicz³⁵, P. Fouque³⁶, J. Greenhill³², K. Hill³², M. Hoffman³⁰, K. Horne³⁴, U. G. Jørgensen³⁷, N. Kains³⁴, D. Kubas²⁶, J. B. Marquette²⁴, R. Martin³⁸, P. Meintjes³⁰, J. Menzies³⁹, K. R. Pollard¹⁰, K. C. Sahu⁴⁰, C. Snodgrass²⁶, I. Steele²⁷, R. Street⁴¹, Y. Tsapras⁴¹, J. Wambsganss³⁶, A. Williams³⁸ and and M. Zub³¹ (The PLANET/RoboNet Collaboration)

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¹ Department of Physics, Chungbuk National University, Cheongju 361-763, Republic of Korea
² Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
³ Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
⁴ Bronberg Observatory, Centre for Backyard Astrophysics Pretoria, South Africa
⁵ Farm Cove Observatory, Centre for Backyard Astrophysics, Pakuranga, Auckland New Zealand
⁶ Universidad de Concepción, Departamento de Fisica, Casilla 160-C, Concepción, Chile
⁷ Institute of Astronomy Cambridge University, Madingley Road, CB3 0HA Cambridge, UK
⁸ Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
⁹ Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
¹⁰ University of Canterbury, Department of Physics and Astronomy, Private Bag 4800, Christchurch 8020, New Zealand
¹¹ Mount John Observatory, P.O. Box 56, Lake Tekapo 8770, New Zealand
¹² School of Chemical and Physical Sciences, Victoria University, Wellington, New Zealand
¹³ Department of Physics, Konan University, Nishiokamoto 8-9-1, Kobe 658-8501, Japan
¹⁴ Nagano National College of Technology, Nagano 381-8550, Japan
¹⁵ Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester, M13 9PL, UK
¹⁶ Tokyo Metropolitan College of Industrial Technology, Tokyo 116-8523, Japan
¹⁷ Vintage Lane Observatory, Blenheim, New Zealand
¹⁸ Auckland Observatory, Auckland, New Zealand
¹⁹ Department of Physics, Texas A&M University, College Station, TX, USA
²⁰ Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
²¹ Korea Astronomy and Space Science Institute, Daejeon 305-348, Republic of Korea
²² AUT University, Auckland, New Zealand
²³ School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK
²⁴ Institut d'Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France
²⁵ Department of Physics, Notre Dame University, Notre Dame, IN 46556, USA
²⁶ European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Vitacura, Santiago 19, Chile
²⁷ Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK
²⁸ Issac Newton Group, Apartado de Correos 321, E-38700 Santa Cruz de La Palma, Spain
²⁹ McDonald Observatory, 16120 St Hwy Spur 78, Fort Davis, TX 79734, USA
³⁰ Department of Physics, Boyden Observatory, University of the Free State, Bloemfontein 9300, South Africa
³¹ Astronomisches Rechen-Institut, Zentrum für Astronomie, Heidelberg University, Mönchhofstr. 12-14, 69120 Heidelberg, Germany
³² University of Tasmania, School of Maths and Physics, Private bag 37, GPO Hobart, Tasmania 7001, Australia
³³ Physics Department, Faculty of Arts and Sciences, University of Rijeka, 51000 Rijeka, Croatia
³⁴ SUPA, Physics and Astronomy, North Haugh, St Andrews, KY16 9SS, UK
³⁵ Technical University of Vienna, Department of Computing, Wiedner Hauptstrasse 10, Vienna, Austria
³⁶ LATT, Universite de Toulouse, CNRS, 14, avenue Edouard Belin, 31400 Toulouse, France
³⁷ Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark
³⁸ Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia
³⁹ South African Astronomical Observatory, P.O. Box 9 Observatory 7935, South Africa
⁴⁰ Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
⁴¹ Las Cumbres Observatory Global Telescope Network, 6740B Cortona Dr, Suite 102, Goleta, CA, 93117, USA
⁴² Microlensing Follow Up Network (μFUN).
⁴³ Optical Gravitational Lens Experiment (OGLE).
⁴⁴ Microlensing Observations in Astrophysics (MOA) Collaboration.

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Abstract References Cited By

To improve the planet detection efficiency, current planetary microlensing experiments are focused on high-magnification events searching for planetary signals near the peak of lensing light curves. However, it is known that central perturbations can also be produced by binary companions and thus it is important to distinguish planetary signals from those induced by binary companions. In this paper, we analyze the light curves of microlensing events OGLE-2007-BLG-137/MOA-2007-BLG-091, OGLE-2007-BLG-355/MOA-2007-BLG-278, and MOA-2007-BLG-199/OGLE-2007-BLG-419, for all of which exhibit short-term perturbations near the peaks of the light curves. From detailed modeling of the light curves, we find that the perturbations of the events are caused by binary companions rather than planets. From a close examination of the light curves combined with the underlying physical geometry of the lens system obtained from modeling, we find that the short timescale caustic-crossing feature occurring at a low or a moderate base magnification with an additional secondary perturbation is a typical feature of binary-lens events and thus can be used for the discrimination between the binary and planetary interpretations.

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INTERPRETATION OF STRONG SHORT-TERM CENTRAL PERTURBATIONS IN THE LIGHT CURVES OF MODERATE-MAGNIFICATION MICROLENSING EVENTS

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