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Gravitational binary-lens events with prominent effects of lens orbital motion

Citation

Park, H and Udalski, A and Han, C and Gould, A and Beaulieu, J-P and Tsapras, Y and Szymanski, MK and Kubiak, M and Soszynski, I and Pietrzynski, G and Poleski, R and Ulaczyk, K and Pietrukowicz, P and Kozlowski, S and Skowron, J and Wyrzykowski, L and Choi, J-Y and DePoy, DL and Dong, S and Gaudi, BS and Hwang, K-H and Jung, YK and Kavka, A and Lee, C-U and Monard, LAG and Park, B-G and Pogge, RW and Porritt, I and Shin, I-G and Yee, JC and Albrow, MD and Bennett, DP and Caldwell, JAR and Cassan, A and Coutures, C and Dominis, D and Donatowicz, J and Fouque, P and Greenhill, J and Huber, M and Jorgensen, UG and Kane, S and Kubas, D and Marquette, J-B and Menzies, J and Pitrou, C and Pollard, KR and Sahu, KC and Wambsganss, J and Williams, A and Zub, M and Allan, A and Bramich, DM and Browne, P and Dominik, M and Horne, K and Hundertmark, M and Kains, N and Snodgrass, C and Steele, IA and Street, RA, Gravitational binary-lens events with prominent effects of lens orbital motion, Astrophysical Journal, 778, (2) Article 134. ISSN 0004-637X (2013) [Refereed Article]


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Copyright 2013 The American Astronomical Society

DOI: doi:10.1088/0004-637X/778/2/134

Abstract

Gravitational microlensing events produced by lenses composed of binary masses are important because they provide a major channel for determining physical parameters of lenses. In this work, we analyze the light curves of two binary-lens events, OGLE-2006-BLG-277 and OGLE-2012-BLG-0031, for which the light curves exhibit strong deviations from standard models. From modeling considering various second-order effects, we find that the deviations are mostly explained by the effect of the lens orbital motion. We also find that lens parallax effects can mimic orbital effects to some extent. This implies that modeling light curves of binary-lens events not considering orbital effects can result in lens parallaxes that are substantially different from actual values and thus wrong determinations of physical lens parameters. This demonstrates the importance of routine consideration of orbital effects in interpreting light curves of binary-lens events. It is found that the lens of OGLE-2006-BLG-277 is a binary composed of a low-mass star and a brown dwarf companion. © 2013. The American Astronomical Society. All rights reserved.

Item Details

Item Type:Refereed Article
Keywords:binaries: general gravitational lensing: micro planets and satellites: general
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Greenhill, J (Dr John Greenhill)
ID Code:89203
Year Published:2013
Web of Science® Times Cited:20
Deposited By:Mathematics and Physics
Deposited On:2014-02-26
Last Modified:2015-02-10
Downloads:0

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