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Microlensing Binaries Discovered through High-magnification Channel

Shin, I.-G. and Kane, S. R. (2012) Microlensing Binaries Discovered through High-magnification Channel. Astrophysical Journal, 746 (2). Art. No. 127. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20120328-120120082

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Abstract

Microlensing can provide a useful tool to probe binary distributions down to low-mass limits of binary companions. In this paper, we analyze the light curves of eight binary-lensing events detected through the channel of high-magnification events during the seasons from 2007 to 2010. The perturbations, which are confined near the peak of the light curves, can be easily distinguished from the central perturbations caused by planets. However, the degeneracy between close and wide binary solutions cannot be resolved with a 3σ confidence level for three events, implying that the degeneracy would be an important obstacle in studying binary distributions. The dependence of the degeneracy on the lensing parameters is consistent with a theoretical prediction that the degeneracy becomes severe as the binary separation and the mass ratio deviate from the values of resonant caustics. The measured mass ratio of the event OGLE-2008-BLG-510/MOA-2008-BLG-369 is q ~ 0.1, making the companion of the lens a strong brown dwarf candidate.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/746/2/127DOIArticle
http://iopscience.iop.org/0004-637X/746/2/127/PublisherArticle
ORCID:
AuthorORCID
Shin, I.-G.0000-0002-4355-9838
Kane, S. R.0000-0002-7084-0529
Additional Information:© 2012 American Astronomical Society. Received 2011 September 15; accepted 2011 December 1; published 2012 February 1. Work by C.H. was supported by Creative Research Initiative Program (2009-0081561) of National Research Foundation of Korea. 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. Work by B.S.G. and A.G. was supported in part by NSF grant AST-1103471. Work by B.S.G., A.G., R.W.P., and J.C.Y. was supported in part by NASA grant NNX08AF40G. Work by J.C.Y. was supported by a National Science Foundation Graduate Research Fellowship under grant No. 2009068160. Work by M.H. was supported by Qatar National Research Fund and Deutsche Forschungsgemeinschaft. TheMOA experiment was supported by JSPS22403003, JSPS20340052, JSPS18253002, and JSPS17340074. T.S. was supported by the grants JSPS18749004, MEXT19015005, and JSPS20740104. F.F., D.R., and J.S. were supported by the Communauté française de Belgique-Actions de recherche concert ées-Académie universitaire Wallonie-Europe.
Funders:
Funding AgencyGrant Number
National Research Foundation of Korea2009-0081561
European Research Council (ERC)FP7/2007-2013
European Research Council (ERC)246678
NSFAST-1103471
NASANNX08AF40G
NSF Graduate Research Fellowship2009068160
Qatar National Research FundUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Japan Society for the Promotion of Science (JSPS)22403003
Japan Society for the Promotion of Science (JSPS)20340052
Japan Society for the Promotion of Science (JSPS)18253002
Japan Society for the Promotion of Science (JSPS)17340074
Japan Society for the Promotion of Science (JSPS)18749004
Ministry of Education, Culture, Sports, Science and Technology (MEXT)19015005
Japan Society for the Promotion of Science (JSPS)20740104
Communauté française de Belgique-Actions de recherche concertées-Académie universitaire Wallonie-EuropeUNSPECIFIED
Subject Keywords: binaries: general; gravitational lensing: micro
Issue or Number:2
Record Number:CaltechAUTHORS:20120328-120120082
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120328-120120082
Official Citation: Microlensing Binaries Discovered through High-magnification Channel I.-G. Shin et al. 2012 ApJ 746 127
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29878
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:28 Mar 2012 21:04
Last Modified:03 Oct 2019 03:45

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