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Kawahara and collaborators analyzed the transits of the candidatedisintegrating Mercury-mass planet KIC 12557548b and suggested that the transitdepths were correlated with the phase of the stellar rotation. We analyze thetransit depths of KIC 12557548b and confirm that there is indeed a robust,statistically significant signal in the transit depths at the rotation periodof the spotted host star. This signal is more prominent in the first-half ofthe Kepler data, and is not due to leakage of the rotating spot signal into ourmeasurement of the transit depths, or due to unocculted starspots. Weinvestigate the suggestion that this signal could be due to an active region onthe star, emitting enhanced ultraviolet or X-ray radiation leading to anincreased mass loss rate of the planet; we confirm that such a scenario couldcause both modulation of the transit depths of KIC 12557548b, and small enoughtransit-timing variations that they might not be detected in the Kepler data.Our preferred explanation for the fact that the transit depths of KIC 12557548bare modulated with the stellar rotation phase is that the candidate transitingplanet is occulting starspots on this highly spotted star; such a scenariocould cause transit depth variations as large as have been observed, and causetransit-timing variations small enough that they are arguably consistent withthe Kepler data.

The Relation between the Transit Depths of KIC 12557548b & the Stellar Rotation Period