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The code, batman, for basic transit model calculation in Python (or a somewhat-different alternate phrase), generates model light curves for extra-solar planet transits, based upon the limb darkening profile and radius of the host star, the radius of the planet, and the planet's path across the star by the planet from our point of view (e.g., the smallest fraction of the star's radius the planet reaches).
Note there exists unrelated astrophysical software named BATMAN (for Bayesian Technique for Multi-image Analysis).