Publikace ÚTF

We have implemented an efficient method for computing the amplification of an extended source with an arbitrary surface brightness profile by a two-point-mass lens. Using our code we study the sensitivity to an extended source for various binary lens configurations and find previously unknown areas of enhanced sensitivity. In addition we investigate the influence of limb darkening on binary microlensing (chromaticity). We provide analytical approximations for both the sensitivity to an extended source and chromaticity. Finally, we compare the linear fold approximation of caustic crossing to the exact light curve for a binary event that was previously used to infer limb-darkening coefficients of the source. We demonstrate that deviations from the linear fold are observationally significant.