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It has been previously shown that moons of extrasolar planets may be detectable with the  Kepler Mission , for moon masses above ∼0.2 M ⊕ . Transit timing effects have been formerly identified as a potent tool to this end, exploiting the dynamics of the system. In this work, we explore the simulation of transit light curves of a planet plus a single moon including not only the transit timing effects, but also the light‐curve signal of the moon itself. We introduce our new algorithm,  luna , which produces transit light curves for both bodies, analytically accounting for shadow overlaps, stellar limb darkening and planet–moon dynamical motion. By building the dynamics into the core of  luna , the routine automatically accounts for transit‐timing/duration variations and ingress/egress asymmetries for not only the planet, but also the moon.  We then generate some artificial data for two feasibly detectable hypothetical systems of interest: (i) prograde and (ii) retrograde Earth‐like moons around a habitable‐zone Neptune for an M dwarf system. We fit the hypothetical systems using  luna  and demonstrate the feasibility of detecting these cases with  Kepler  photometry.

luna : an algorithm for generating dynamic planet–moon transits