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

D Kubas, A Cassan, J P Beaulieu, C Coutures, M Dominik, M D Albrow, S Brillant, J A R Caldwell, D Dominis, J Donatowicz, C Fendt, P Fouque, U G Jorgensen, J Greenhill, K Hill, J Heinmuller, K Horne, S Kane, J B Marquette, R MartinJ Menzies, K R Pollard, K C Sahu, C Vinter, J Wambsganss, R Watson, A Williams, C Thurl

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

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-⊙ 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.

Original languageEnglish
Pages (from-to)941-948
Number of pages8
JournalAstronomy & Astrophysics
Volume435
DOIs
Publication statusPublished - Jun 2005

Keywords

  • gravitational lensing
  • stars : atmospheres
  • stars : binaries : general
  • MICROLENSING FOLD CAUSTICS
  • LIMB-DARKENING MEASUREMENT
  • GRAVITATIONAL LENS
  • GALACTIC BULGE
  • STELLAR ATMOSPHERE
  • MAGNIFICATION
  • PHOTOMETRY
  • GIANT
  • STAR
  • RESOLUTION

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