A Caltech Library Service

Gravitational Binary-lens Events with Prominent Effects of Lens Orbital Motion

Park, H. and Kane, S. (2013) Gravitational Binary-lens Events with Prominent Effects of Lens Orbital Motion. Astrophysical Journal, 778 (2). Art. No. 134. ISSN 0004-637X. doi:10.1088/0004-637X/778/2/134.

PDF - Published Version
See Usage Policy.

PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Kane, S.0000-0002-7084-0529
Additional Information:© 2013 American Astronomical Society. Received 2013 June 17; accepted 2013 October 4; published 2013 November 12. Work by C.H. was supported by the Creative Research Initiative Program (2009-0081561) of the National Research Foundation of Korea. A.G. was supported by NSF grant AST 1103471. The OGLE project has received funding from the European Research Council under the European Community’s Seventh Framework Programme (FP7/2007–2013)/ERC grant agreement No. 246678 to A.U. S.D. was supported through a Ralph E. and Doris M. Hansmann Membership at the IAS and NSF grant AST-0807444. D.M.B., M.D., M.H., R.A.S., and Y.T. thank the Qatar Foundation for support from QNRF grant NPRP-09-476-1-078. Dr. David Warren gave financial support to Mt. Canopus Observatory.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
National Research Foundation of Korea2009-0081561
European Research Council (ERC)246678
IAS Ralph E. and Doris M. Hansmann MembershipUNSPECIFIED
Qatar Foundation QNRFNPRP-09-476-1-078
Subject Keywords: binaries: general; gravitational lensing: micro; planets and satellites: general
Issue or Number:2
Record Number:CaltechAUTHORS:20140106-134406730
Persistent URL:
Official Citation:Gravitational Binary-lens Events with Prominent Effects of Lens Orbital Motion H. Park et al. 2013 ApJ 778 134
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43231
Deposited By: Ruth Sustaita
Deposited On:06 Jan 2014 22:19
Last Modified:10 Nov 2021 16:34

Repository Staff Only: item control page