Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations
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_sol 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_sol). 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.
Keywords
Cite
@article{arxiv.astro-ph/0502018,
title = {Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations},
author = {D. Kubas and A. Cassan and J. P. Beaulieu and C. Coutures and M. Dominik and M. D. Albrow and S. Brillant and J. A. R. Caldwell and D. Dominis and J. Donatowicz and P. Fouque and U. G. Jorgensen and J. Greenhill and K. Hill and K. Horne and S. Kane and J. B. Marquette and R. Martin and J. Menzies and K. R. Pollard and K. C. Sahu and C. Vinter and J. Wambsganss and R. Watson and A. Williams and C. Fendt and J. Heinmueller and C. Thurl},
journal= {arXiv preprint arXiv:astro-ph/0502018},
year = {2009}
}
Comments
9 pages, 9 figures, accepted by A&A