qpower2 - a fast and accurate algorithm for the computation of exoplanet transit light curves with the power-2 limb-darkening law

P. F. L. Maxted, S. Gill

The power-2 law, $I_{\lambda }(\mu )=1-c(1-{\mu }^{\alpha })$, accurately represents the limb-darkening profile for cool stars. It has been implemented in a few transit models to-date using numerical i…