Light-curve calculations for triple microlensing systems

ABSTRACT We present a method to compute the magnification of finite source star lensed by triple lens system based on image boundary (contour integration) method. describe new procedure obtain continuous boundaries from solutions tenth-order polynomial obtained equation. Contour integration is then applied calculate areas within boundaries, which yields with uniform brightness. extend calculation limb-darkened stars approximated linear profile. In principle, this works for all multiple systems, not just lenses. also include an adaptive sampling and interpolation calculating densely covered light curves. The C++ code corresponding python interface are publicly available.