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OGLE-2005-BLG-018: Characterization of full physical and orbital parameters of a gravitational binary lens


Shin, IG and Uldalski, A and Han, C and Gould, A and Dominik, M and Fouque, P and Kubiak, M and Szymanski, MK and Pietrzynki, G and Soszynski, I and Ulaczyk, K and Wyrzykowski, L and DePoy, DL and Dong, S and Gaudi, BS and Lee, CU and Park, BG and Pogge, RW and Albrow, MD and Allan, A and Beaulieu, JP and Bennett, DP and Bode, M and Bramich, DM and Brillant, S and Burgdorf, M and Calitz, H and Cassan, A and Cook, KH and Corrales, E and Coutures, CH and Desort, N and Dieters, S and Dominis Prester, D and Donatowicz, J and Fraser, SN and Greenhill, J and Hill, K and Hoffman, M and Horne, K and Jorgensen, UG and Kane, SR and Kubas, D and Marquette, JB and Martin, R and Meintjes, P and Menzies, J and Mottram, C and Naylor, T and Pollard, KR and Sahu, KC and Snodgrass, C and Steele, I and Vinter, C and Wambsganss, J and Williams, A and Woller, K, OGLE-2005-BLG-018: Characterization of full physical and orbital parameters of a gravitational binary lens, The Astrophysical Journal: An International Review of Astronomy and Astronomical Physics, 735, (2) Article 85. ISSN 0004-637X (2011) [Refereed Article]

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Copyright 2011 The American Astronomical Society.

DOI: doi:10.1088/0004-637X/735/2/85


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 Details

Item Type:Refereed Article
Keywords:binaries: general – gravitational lensing: micro
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 physical sciences
UTAS Author:Dieters, S (Dr Stefan Dieters)
UTAS Author:Greenhill, J (Dr John Greenhill)
UTAS Author:Hill, K (Dr Kym Hill)
ID Code:71668
Year Published:2011
Web of Science® Times Cited:25
Deposited By:Mathematics and Physics
Deposited On:2011-07-29
Last Modified:2017-11-03
Downloads:5 View Download Statistics

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