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Predicting the second caustic crossing in binary microlensing events
Authors:Micha&#; Jaroszy&#;ski  Shude Mao
Institution:1Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland;2University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL;3Princeton University Observatory, Princeton, NJ 08544-1001, USA
Abstract:We fit binary lens models to the data covering the initial part of real microlensing events in an attempt to predict the time of the second caustic crossing. We use approximations during the initial search through the parameter space for light curves that roughly match the observed ones. Exact methods for calculating the lens magnification of an extended source are used when we refine our best initial models. Our calculations show that the reliable prediction of the second crossing can only be made very late, when the light curve has risen appreciably after the minimum between the two caustic crossings. The best observational strategy is therefore to sample as frequently as possible once the light curve starts to rise after the minimum.
Keywords:gravitational lensing  galaxies: nuclei  galaxies: structure  dark matter
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