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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 276717.0, MPI für Astronomie / Publikationen_mpia
Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations
Authors:Kubas, D.; Cassan, A.; Beaulieu, J. P.; Coutures, C.; Dominik, M.; Albrow, M. D.; Brillant, S.; Caldwell, J. A. R.; Dominis, D.; Donatowicz, J.; Fendt, C.; Fouqué, P.; Jørgensen, U. G.; Greenhill, J.; Hill, K.; Heinmüller, J.; Horne, K.; Kane, S.; Marquette, J. B.; Martin, R.; Menzies, J.; Pollard, K. R.; Sahu, K. C.; Vinter, C.; Wambsganss, J.; Watson, R.; Williams, A.; Thurl, C.
Date of Publication (YYYY-MM-DD):2005
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:Astronomy and Astrophysics
Start Page:941
End Page:948
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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_â_™ and distance of D{L}=(2.9± 0.4) {{kpc}}, the wide binary lens solution requires a rather implausible binary black-hole lens (M â‰_ 126 M_â_™). 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.
Free Keywords:gravitational lensing; stars: atmospheres; stars: binaries: general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL: bib_query?b... [ID No:1]
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