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

被引：4

作者：

Han, C. ^{[1
]}

Hwang, K. -H. ^{[1
]}

Kim, D. ^{[1
]}

Udalski, A. ^{[2
]}

Abe, F. ^{[3
]}

Monard, L. A. B. ^{[4
]}

McCormick, J. ^{[5
]}

Szymanski, M. K. ^{[2
]}

Kubiak, M. ^{[2
]}

Pietrzynski, G. ^{[2
,6
]}

Soszynski, I. ^{[2
]}

Szewczyk, O. ^{[6
]}

Wyrzykowski, L. ^{[7
]}

Ulaczyk, K. ^{[2
]}

Bond, I. A. ^{[8
]}

Botzler, C. S. ^{[9
]}

Fukui, A. ^{[3
]}

Furusawa, K. ^{[3
]}

Hearnshaw, J. B. ^{[10
]}

Itow, Y. ^{[3
]}

Kamiya, K. ^{[3
]}

Kilmartin, P. M. ^{[11
]}

Korpela, A. ^{[12
]}

Lin, W. ^{[8
]}

Ling, C. H. ^{[8
]}

Masuda, K. ^{[3
]}

Matsubara, Y. ^{[3
]}

Miyake, N. ^{[3
]}

Muraki, Y. ^{[13
]}

Nagaya, M. ^{[3
]}

Ohnishi, K. ^{[14
]}

Tokumura, T. ^{[3
]}

Perrott, Y. C. ^{[9
]}

Rattenbury, N. ^{[15
]}

Saito, To. ^{[16
]}

Sako, T. ^{[3
]}

Skuljan, L. ^{[8
]}

Sullivan, D. S. ^{[12
]}

Sumi, T. ^{[3
]}

Sweatman, W. L. ^{[8
]}

Tristram, P. J. ^{[11
]}

Yock, P. C. M. ^{[9
]}

Allen, W. ^{[17
]}

Christie, G. W. ^{[18
]}

DePoy, D. L. ^{[19
]}

Dong, S. ^{[20
]}

Gaudi, B. S. ^{[20
]}

Gould, A. ^{[20
]}

Lee, C. -U. ^{[21
]}

Natusch, T. ^{[22
]}

机构：

[1] Chungbuk Natl Univ, Dept Phys, Cheongju 361763, South Korea

[2] Univ Warsaw Observ, PL-00478 Warsaw, Poland

[3] Nagoya Univ, Solar Terr Environm Lab, Nagoya, Aichi 4648601, Japan

[4] Ctr Backyard Astrophys Pretoria, Bronberg Observ, Pretoria, South Africa

[5] Ctr Backyard Astrophys, Farm Cove Observ, Auckland, New Zealand

[6] Univ Concepcion, Dept Fis, Concepcion, Chile

[7] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[8] Massey Univ, Inst Informat & Math Sci, Auckland, New Zealand

[9] Univ Auckland, Dept Phys, Auckland, New Zealand

[10] Univ Canterbury, Dept Phys & Astron, Christchurch 8020, New Zealand

[11] Mt John Observ, Lake Tekapo 8770, New Zealand

[12] Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington, New Zealand

[13] Konan Univ, Dept Phys, Kobe, Hyogo 6588501, Japan

[14] Nagano Natl Coll Technol, Nagano 3818550, Japan

[15] Univ Manchester, Jodrell Bank, Ctr Astrophys, Manchester M13 9PL, Lancs, England

[16] Tokyo Metropolitan Coll Ind Technol, Tokyo 1168523, Japan

[17] Vintage Lane Observ, Blenheim, New Zealand

[18] Auckland Observ, Auckland, New Zealand

[19] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA

[20] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA

[21] Korea Astron & Space Sci Inst, Taejon 305348, South Korea

[22] AUT Univ, Auckland, New Zealand

[23] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England

[24] Inst Astrophys, F-75014 Paris, France

[25] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA

[26] European So Observ, Santiago 19, Chile

[27] Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead CH41 1LD, Merseyside, England

[28] Issac Newton Grp, E-38700 Santa Cruz De La Palma, Spain

[29] McDonald Observ, Ft Davis, TX 79734 USA

[30] Univ Orange Free State, Dept Phys, Boyden Observ, ZA-9300 Bloemfontein, South Africa

[31] Univ Heidelberg, Astron Rechen Inst, Zentrum Astron, D-69120 Heidelberg, Germany

[32] Univ Tasmania, Sch Math & Phys, Gpo Hobart, Tas 7001, Australia

[33] Univ Rijeka, Dept Phys, Fac Arts & Sci, Rijeka 51000, Croatia

[34] SUPA Phys & Astron, St Andrews KY16 9SS, Fife, Scotland

[35] Vienna Univ Technol, Dept Comp, A-1060 Vienna, Austria

[36] Univ Toulouse, LATT, CNRS, F-31400 Toulouse, France

[37] Niels Bohr Inst, Astron Observ, DK-2100 Copenhagen, Denmark

[38] Perth Observ, Perth, WA 6076, Australia

[39] S African Astron Observ, ZA-7935 Cape Town, South Africa

[40] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[41] Las Cumbres Observ Global Telescope Network, Goleta, CA 93117 USA

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 705卷 / 02期

基金：

美国国家科学基金会; 新加坡国家研究基金会;

关键词：

gravitational lensing; planetary systems; PLANETARY SYSTEMS; EARTH MASS; DEGENERACY; CAUSTICS; HUNT; LENS;

D O I：

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

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 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.

引用

页码：1116 / 1121

页数：6

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