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Very high quality light curves are now available for thousands of detachedeclipsing binary stars and transiting exoplanet systems as a result of surveysfor transiting exoplanets and other large-scale photometric surveys. I havedeveloped a binary star model (ELLC) that can be used to analyse the lightcurves of detached eclipsing binary stars and transiting exoplanet systems thatis fast and accurate, and that can include the effects of star spots, Dopplerboosting and light-travel time within binaries with eccentric orbits. The modelrepresents the stars as triaxial ellipsoids. The apparent flux from the binaryis calculated using Gauss-Legendre integration over the ellipses that are theprojection of these ellipsoids on the sky. The model can also be used tocalculate the flux-weighted radial velocity of the stars during an eclipse(Rossiter-McLaughlin effect). The main features of the model have been testedby comparison to observed data and other light curve models. The model is foundto be accurate enough to analyse the very high quality photometry that is nowavailable from space-spaced instruments, flexible enough to model a wide rangeof eclipsing binary stars and extrasolar planetary systems, and fast enough toenable the use of modern Monte Carlo methods for data analysis and modeltesting.

ELLC - a fast, flexible light curve model for detached eclipsing binary stars and transiting exoplanets