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Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations

Citation

Kubas, D and Cassan, A and Beaulieu, JP and Coutures, C and Dominik, M and Albrow, MD and Brillant, S and Caldwell, JAR and Dominis, D and Donatowicz, J and Fendt, C and Fouque, P and Jorgensen, UG and Greenhill, JG and Hill, KM and Heinmuller, J and Horne, K and Kane, S and Marquette, JB and Martin, R and Menzies, J and Pollard, KR and Sahu, KC and Vinter, C and Wambsganss, J and Watson, RD and Williams, A and Thurl, C, Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations, Astronomy & Astrophysics , 435, (3) pp. 941-948. ISSN 0004-6361 (2005) [Refereed Article]

DOI: doi:10.1051/0004-6361:20042624

Abstract

We analyze the photometric data obtained by PLANET and OGLE on the caustic-crossing binary-lens microlensing event OGLE-2002-BLG-069. Thanks to the excellent photometric and spectroscopic coverage of the event, we are able to constrain the lens model up to the known ambiguity between close and wide binary lenses. The detection of annual parallax in combination with measurements of extended-source effects allows us to determine the mass, distance and velocity of the lens components for the competing models. While the model involving a close binary lens leads to a Bulge-Disc lens scenario with a lens mass of M = (0.51 ± 0.15) M odot; and distance of D L = (2.9 ± 0.4) kpc, the wide binary lens solution requires a rather implausible binary black-hole lens (M ≳126 M ⊙). Furthermore we compare current state-of-the-art numerical and empirical models for the surface brightness profile of the source, a G5III Bulge giant. We find that a linear limb-darkening model for the atmosphere of the source star is consistent with the data whereas a PHOENIX atmosphere model assuming LTE and with no free parameter does not match our observations. © ESO 2005.

Item Details

Item Type:Refereed Article
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, JG (Dr John Greenhill)
Author:Hill, KM (Dr Kym Hill)
Author:Watson, RD (Dr Bob Watson)
ID Code:35555
Year Published:2005
Web of Science® Times Cited:31
Deposited By:Physics
Deposited On:2005-08-01
Last Modified:2006-03-29
Downloads:0

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