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


Han, C and Hwang, KH and Kim, D and Udalski, A and Abe, F and Monard, LAB and McCormick, J and Szymanski, MK and Kubiak, M and Pietrzynski, G and Soszynski, I and Szewczyk, O and Wyrzykowski, L and Ulaczyk, K and Bond, IA and Botzler, CS and Fukui, A and Furusawa, K and Hearnshaw, JB and Itow, Y and Kamiya, K and Kilmartin, PM and Korpela, A and Lin, W and Ling, CH and Masuda, K and Matsubara, Y and Miyake, N and Muraki, Y and Nagaya, M and Ohnishi, K and Tokumura, T and Perrott, YC and Rattenbury, N and Saito, T and Sako, T and Skuljan, L and Sullivan, DS and Sumi, T and Sweatman, WL and Tristram, PJ and Yock, PCM and Allen, W and Christie, GW and DePoy, DL and Dong, S and Gaudi, BS and Gould, A and Lee, CU and Natusch, T and Park, BG and Pogge, RW and Albrow, MD and Allan, A and Batista, V and Beaulieu, JP and Bennett, DP and Brilliant, S and Bode, M and Bramich, DM and Burgdorf, M and Caldwell, JAR and Calitz, H and Cassan, A and Corrales, E and Dieters, S and Prester, DD and Dominik, M and Donatowicz, J and Fouque, P and Greenhill, JG and Hill, KM and Hoffman, M and Horne, K and Jorgensen, UG and Kains, N and Kubas, D and Marquette, JB and Martin, R and Meintjes, P and Menzies, J and Pollard, KR and Sahu, KC and Snodgrass, C and Steele, I and Street, R and Tsapras, Y and Wambsganss, J and Williams, A and Zub, M, Interpretation of Strong Short-term Central Perturbations in the Light Curves of Moderate-Magnification Microlensing Events, The Astrophysical Journal: An International Review of Astronomy and Astronomical Physics, 705, (2) pp. 1116-1121. ISSN 0004-637X (2009) [Refereed Article]

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C 2009. The American Astronomical Society. All rights reserved.

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


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.

Item Details

Item Type:Refereed Article
Keywords:gravitational lensing, planetary systems
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the mathematical sciences
UTAS Author:Greenhill, JG (Dr John Greenhill)
UTAS Author:Hill, KM (Dr Kym Hill)
ID Code:58878
Year Published:2009
Web of Science® Times Cited:4
Deposited By:Physics
Deposited On:2009-11-03
Last Modified:2015-02-10

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