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

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dc.creatorAlbrow, M. D.
dc.creatorAn, J.
dc.creatorBeaulieu, J. -P.
dc.creatorCaldwell, J. A. R.
dc.creatorDePoy, D. L.
dc.creatorDominik, M.
dc.creatorGaudi, B. S.
dc.creatorGould, A.
dc.creatorGreenhill, J.
dc.creatorHill, K.
dc.creatorKane, S.
dc.creatorMartin, R.
dc.creatorMenzies, J.
dc.creatorPogge, R. W.
dc.creatorPollard, K. R.
dc.creatorSackett, P. D.
dc.creatorSahu, K. C.
dc.creatorVermaak, P.
dc.creatorWatson, R.
dc.creatorWilliams, A.
dc.date2000-04-18
dc.date2000-11-01
dc.date.accessioned2026-07-07T11:07:55Z
dc.date.available2026-07-07T11:07:55Z
dc.descriptionWe 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.
dc.description30 pages (including 3 tables, 10 figures), AASTeX, accepted for the publication in ApJ, accepted version (including the replacement of fig 8)
dc.identifierhttps://arxiv.org/abs/astro-ph/0004243
dc.identifierhttp://arxiv.org/abs/astro-ph/0004243
dc.identifierAstrophys.J.549:759-769,2001
dc.identifierdoi:10.1086/319437
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/189968
dc.subjectAstrophysics
dc.titlePLANET observations of microlensing event OGLE-1999-BUL-23: limb darkening measurement of the source star
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