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Presentation #309.05 in the session Exoplanet-Star Interactions.
In exoplanet atmospheres, Lyman Alpha radiation can ionize atoms, dissociate molecules, and exert pressure forces that drive an outflow. Monte Carlo simulations of such phenomena have a large computational cost due to the extreme optical depths at Lya line center. We present a novel, semi-analytic solution to the radiative transfer equation for resonant scattering that is shown to correct discrepancies in previous models as compared with Monte Carlo. We also present a time-dependent solution that can be used to accelerate Monte Carlo simulations by sampling the photon escape time distribution directly.