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Title:
Interpretation of Strong Short-Term Central Perturbations in the Light Curves of Moderate-Magnification Microlensing Events
Authors:
Han, C.; Hwang, K.-H.; Kim, D.; Udalski, A.; Abe, F.; Monard, L. A. B.; McCormick, J.; Szymański, M. K.; Kubiak, M.; Pietrzyński, G.; Soszyński, I.; Szewczyk, O.; Wyrzykowski, Ł.; Ulaczyk, K.; The OGLE Collaboration; Bond, I. A.; Botzler, C. S.; Fukui, A.; Furusawa, K.; Hearnshaw, J. B.; Itow, Y.; Kamiya, K.; Kilmartin, P. M.; Korpela, A.; Lin, W.; Ling, C. H.; Masuda, K.; Matsubara, Y.; Miyake, N.; Muraki, Y.; Nagaya, M.; Ohnishi, K.; Tokumura, T.; Perrott, Y. C.; Rattenbury, N.; Saito, To.; Sako, T.; Skuljan, L.; Sullivan, D. S.; Sumi, T.; Sweatman, W. L.; Tristram, P. J.; Yock, P. C. M.; The MOA Collaboration; Allen, W.; Christie, G. W.; De Poy, D. L.; Dong, S.; Gaudi, B. S.; Gould, A.; Lee, C.-U.; Natusch, T.; Park, B.-G.; Pogge, R. W.; The μFUN Collaboration; Albrow, M. D.; Allan, A.; Batista, V.; Beaulieu, J. P.; Bennett, D. P.; Brillant, S.; Bode, M.; Bramich, D. M.; Burgdorf, M.; Caldwell, J. A. R.; Calitz, H.; Cassan, A.; Corrales, E.; Dieters, S.; Prester, D. D.; Dominik, M.; Donatowicz, J.; Fouque, P.; Greenhill, J.; Hill, K.; Hoffman, M.; Horne, K.; Jørgensen, U. G.; Kains, N.; Kubas, D.; Marquette, J. B.; Martin, R.; Meintjes, P.; Menzies, J.; Pollard, K. R.; Sahu, K. C.; Snodgrass, C.; Steele, I.; Street, R.; Tsapras, Y.; Wambsganss, J.; Williams, A.; Zub, M.; The PLANET/Robo Net Collaboration
Affiliation:
AA(Department of Physics, Chungbuk National University, Cheongju 361-763, Republic of Korea ; Microlensing Follow Up Network (μFUN). ), AB(Department of Physics, Chungbuk National University, Cheongju 361-763, Republic of Korea ), AC(Department of Physics, Chungbuk National University, Cheongju 361-763, Republic of Korea ), AD(Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland ; Optical Gravitational Lens Experiment (OGLE). ), AE(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan ; Microlensing Observations in Astrophysics (MOA) Collaboration.), AF(Bronberg Observatory, Centre for Backyard Astrophysics Pretoria, South Africa ; Microlensing Follow Up Network (μFUN). ), AG(Farm Cove Observatory, Centre for Backyard Astrophysics, Pakuranga, Auckland New Zealand ; Microlensing Follow Up Network (μFUN). ), AH(Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland ), AI(Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland ), AJ(Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland ; Universidad de Concepción, Departamento de Fisica, Casilla 160-C, Concepción, Chile ), AK(Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland ), AL(Universidad de Concepción, Departamento de Fisica, Casilla 160-C, Concepción, Chile ), AM(Institute of Astronomy Cambridge University, Madingley Road, CB3 0HA Cambridge, UK ), AN(Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland ), AO(), AP(Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand ), AQ(Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand ), AR(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan ), AS(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan ), AT(University of Canterbury, Department of Physics and Astronomy, Private Bag 4800, Christchurch 8020, New Zealand ), AU(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan ), AV(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan ), AW(Mount John Observatory, P.O. Box 56, Lake Tekapo 8770, New Zealand ), AX(School of Chemical and Physical Sciences, Victoria University, Wellington, New Zealand ), AY(Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand ), AZ(Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand ), BA(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan ), BB(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan ), BC(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan ), BD(Department of Physics, Konan University, Nishiokamoto 8-9-1, Kobe 658-8501, Japan ), BE(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan ), BF(Nagano National College of Technology, Nagano 381-8550, Japan ), BG(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan ), BH(Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand ), BI(Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester, M13 9PL, UK ), BJ(Tokyo Metropolitan College of Industrial Technology, Tokyo 116-8523, Japan ), BK(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan ), BL(Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand ), BM(School of Chemical and Physical Sciences, Victoria University, Wellington, New Zealand ), BN(Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan ), BO(Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand ), BP(Mount John Observatory, P.O. Box 56, Lake Tekapo 8770, New Zealand ), BQ(Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand ), BR(), BS(Vintage Lane Observatory, Blenheim, New Zealand ), BT(Auckland Observatory, Auckland, New Zealand ), BU(Department of Physics, Texas A&M University, College Station, TX, USA ), BV(Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), BW(Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), BX(Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), BY(Korea Astronomy and Space Science Institute, Daejeon 305-348, Republic of Korea ), BZ(AUT University, Auckland, New Zealand ), CA(Korea Astronomy and Space Science Institute, Daejeon 305-348, Republic of Korea ), CB(Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), CC(), CD(University of Canterbury, Department of Physics and Astronomy, Private Bag 4800, Christchurch 8020, New Zealand ), CE(School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK ), CF(Institut d'Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France ), CG(Institut d'Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France ), CH(Department of Physics, Notre Dame University, Notre Dame, IN 46556, USA ), CI(European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Vitacura, Santiago 19, Chile ), CJ(Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK ), CK(Issac Newton Group, Apartado de Correos 321, E-38700 Santa Cruz de La Palma, Spain ), CL(Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK ), CM(McDonald Observatory, 16120 St Hwy Spur 78, Fort Davis, TX 79734, USA ), CN(Department of Physics, Boyden Observatory, University of the Free State, Bloemfontein 9300, South Africa ), CO(Astronomisches Rechen-Institut, Zentrum für Astronomie, Heidelberg University, Mönchhofstr. 12-14, 69120 Heidelberg, Germany ), CP(Institut d'Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France ), CQ(Institut d'Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France ; University of Tasmania, School of Maths and Physics, Private bag 37, GPO Hobart, Tasmania 7001, Australia ), CR(Physics Department, Faculty of Arts and Sciences, University of Rijeka, 51000 Rijeka, Croatia ), CS(SUPA, Physics and Astronomy, North Haugh, St Andrews, KY16 9SS, UK ), CT(Technical University of Vienna, Department of Computing, Wiedner Hauptstrasse 10, Vienna, Austria ), CU(LATT, Universite de Toulouse, CNRS, 14, avenue Edouard Belin, 31400 Toulouse, France ), CV(University of Tasmania, School of Maths and Physics, Private bag 37, GPO Hobart, Tasmania 7001, Australia ), CW(University of Tasmania, School of Maths and Physics, Private bag 37, GPO Hobart, Tasmania 7001, Australia ), CX(Department of Physics, Boyden Observatory, University of the Free State, Bloemfontein 9300, South Africa ), CY(SUPA, Physics and Astronomy, North Haugh, St Andrews, KY16 9SS, UK ), CZ(Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark ), DA(SUPA, Physics and Astronomy, North Haugh, St Andrews, KY16 9SS, UK ), DB(European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Vitacura, Santiago 19, Chile ), DC(Institut d'Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France ), DD(Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia ), DE(Department of Physics, Boyden Observatory, University of the Free State, Bloemfontein 9300, South Africa ), DF(South African Astronomical Observatory, P.O. Box 9 Observatory 7935, South Africa ), DG(University of Canterbury, Department of Physics and Astronomy, Private Bag 4800, Christchurch 8020, New Zealand ), DH(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA ), DI(European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Vitacura, Santiago 19, Chile ), DJ(Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK ), DK(Las Cumbres Observatory Global Telescope Network, 6740B Cortona Dr, Suite 102, Goleta, CA, 93117, USA ), DL(Las Cumbres Observatory Global Telescope Network, 6740B Cortona Dr, Suite 102, Goleta, CA, 93117, USA ), DM(LATT, Universite de Toulouse, CNRS, 14, avenue Edouard Belin, 31400 Toulouse, France ), DN(Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia ), DO(Astronomisches Rechen-Institut, Zentrum für Astronomie, Heidelberg University, Mönchhofstr. 12-14, 69120 Heidelberg, Germany ), DP()
Publication:
The Astrophysical Journal, Volume 705, Issue 2, pp. 1116-1121 (2009). (ApJ Homepage)
Publication Date:
11/2009
Origin:
IOP
ApJ Keywords:
gravitational lensing, planetary systems
DOI:
10.1088/0004-637X/705/2/1116
Bibliographic Code:
2009ApJ...705.1116H

Abstract

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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