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OGLE-2005-BLG-018: Characterization of Full Physical and Orbital Parameters of a Gravitational Binary Lens

Shin, I.-G. and Kane, S. R. (2011) OGLE-2005-BLG-018: Characterization of Full Physical and Orbital Parameters of a Gravitational Binary Lens. Astrophysical Journal, 735 (2). Art. No. 85. ISSN 0004-637X.

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We present the result of the analysis of the gravitational binary-lensing event OGLE-2005-BLG-018. The light curve of the event is characterized by two adjacent strong features and a single weak feature separated from the strong features. The light curve exhibits noticeable deviations from the best-fit model based on standard binary parameters. To explain the deviation, we test models including various higher-order effects of the motions of the observer, source, and lens. From this, we find that it is necessary to account for the orbital motion of the lens in describing the light curve. From modeling the light curve considering the parallax effect and Keplerian orbital motion, we are able to not only measure the physical parameters but also to find a complete orbital solution of the lens system. It is found that the event was produced by a binary lens located in the Galactic bulge with a distance of 6.7 ± 0.3 kpc from the Earth. The individual lens components with masses 0.9 ± 0.3 M_⊙ and 0.5 ± 0.1 M_⊙ are separated with a semi-major axis of a = 2.5 ± 1.0 AU and orbiting each other with a period P = 3.1 ± 1.3 yr. This event demonstrates that it is possible to extract detailed information about binary lens systems from well-resolved lensing light curves.

Item Type:Article
Related URLs:
URLURL TypeDescription
Shin, I.-G.0000-0002-4355-9838
Kane, S. R.0000-0002-7084-0529
Additional Information:© 2011 American Astronomical Society. Received 2011 February 21; accepted 2011 April 22; published 2011 June 20. This work was supported by the research grant of the Chungbuk National University in 2009. Work by A.G. was supported by NSF grant AST-0757888. 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.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
European Research Council (ERC)246678
Subject Keywords:binaries: general; gravitational lensing: micro
Issue or Number:2
Classification Code:PACS: 98.35.Jk; 98.35.Ln; 95.30.Sf; 98.35.Df; 95.85.Kr
Record Number:CaltechAUTHORS:20110713-111633094
Persistent URL:
Official Citation:OGLE-2005-BLG-018: Characterization of Full Physical and Orbital Parameters of a Gravitational Binary Lens I.-G. Shin, A. Udalski, C. Han, A. Gould, M. Dominik, P. Fouqué, and M. Kubiak, M. K. Szymanski, G. Pietrzynki, I. Soszynski, K. Ulaczyk, L. Wyrzykowski (The OGLE Collaboration), D. L. DePoy, S. Dong, B. S. Gaudi, C.-U. Lee, B.-G. Park, R. W. Pogge (The µFUN Collaboration), M. D. Albrow, A. Allan, J. P. Beaulieu, D. P. Bennett, M. Bode, D. M. Bramich, S. Brillant, M. Burgdorf, H. Calitz, A. Cassan, K. H. Cook, E. Corrales, Ch. Coutures, N. Desort, S. Dieters, D. Dominis Prester, J. Donatowicz, S. N. Fraser, J. Greenhill, K. Hill, M. Hoffman, K. Horne, U. G. Jörgensen, S. R. Kane, D. Kubas, J. B. Marquette, R. Martin, P. Meintjes, J. Menzies, C. Mottram, T. Naylor, K. R. Pollard, K. C. Sahu, C. Snodgrass, I. Steele, C. Vinter, J. Wambsganss, A. Williams, and K. Woller (The PLANET/RoboNet Collaborations) doi: 10.1088/0004-637X/735/2/85
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24407
Deposited By: Ruth Sustaita
Deposited On:18 Jul 2011 16:36
Last Modified:03 Oct 2019 02:56

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