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Kepler-22b is the first transiting planet to have been detected in thehabitable-zone of its host star. At 2.4 Earth radii, Kepler-22b is too large tobe considered an Earth-analog, but should the planet host a moon large enoughto maintain an atmosphere, then the Kepler-22 system may yet possess a telluricworld. Aside from being within the habitable-zone, the target is attractive dueto the availability of previously measured precise radial velocities and lowintrinsic photometric noise, which has also enabled asteroseismology studies ofthe star. For these reasons, Kepler-22b was selected as a target-of-opportunityby the 'Hunt for Exomoons with Kepler' (HEK) project. In this work, we conducta photodynamical search for an exomoon around Kepler-22b leveraging thetransits, radial velocities and asteroseismology plus several new toolsdeveloped by the HEK project to improve exomoon searches. We find no evidencefor an exomoon around the planet and exclude moons of mass >0.5 Earth masses to95% confidence. By signal injection and blind retrieval, we demonstrate that anEarth-like moon is easily detected for this planet even when thetime-correlated noise of the data set is taken into account. We provide updatedparameters for the planet Kepler-22b including a revised mass of <53 Earthmasses to 95% confidence and an eccentricity of 0.13(-0.13)(+0.36) byexploiting Single-body Asterodensity Profiling (SAP). Finally, we show thatKepler-22b has a >95% probability of being within the empirical habitable-zonebut a <5% probability of being within the conservative habitable-zone.

The Hunt for Exomoons with Kepler (HEK): III. The First Search for an Exomoon around a Habitable-Zone Planet