PLANET observations of microlensing event OGLE-1999-BUL-23: limb darkening measurement of the source star

Details PLANET observations of microlensing event OGLE-1999-BUL-23: limb darkening measurement of the source star PLANET observations of microlensing event OGLE-1999-BUL-23: limb darkening measurement of the source star

2000-04-18

arxiv.org/abs/astro-ph/0004243v2

Astrophys.J.549:759-769,2001

Astronomy and Astrophysics

Astrophysics

30 pages (including 3 tables, 10 figures), AASTeX, accepted for the publication in ApJ, accepted version (including the replac

Scientific paper

10.1086/319437

We present PLANET observations of OGLE-1999-BUL-23, a binary-lens microlensing event towards the Galactic bulge. PLANET observations in the I and V bands cover the event from just before the first caustic crossing until the end of the event. In particular, a densely-sampled second caustic crossing enables us to derive the linear limb-darkening coefficients of the source star; c_V = 0.786^{+0.080}_{-0.078} and c_I = 0.632^{+0.047}_{-0.037}. Combined analysis of the light curve and the color-magnitude diagram suggests that the source star is a G/K subgiant in the Galactic bulge (T_eff = 4800 K). The resulting linear limb-darkening coefficient of the source is consistent with theoretical predictions, although it is likely that non-linearity of the stellar surface brightness profile complicates the interpretation, especially for the I band. The global light curve fit to the data indicates that the event is due to a binary lens of a mass ratio q = 0.39 and a projected separation d = 2.42. The lens/source relative proper motion is (22.8 +_ 1.5) km/s/kpc, typical of bulge/bulge or bulge/disk events.

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