By analysing the K2 short-cadence photometry we detect starspot occultation events in the lightcurve of WASP-107 , the host star of a warm-Saturn exoplanet .
WASP-107 also shows a rotational modulation with a period of 17.5 \pm 1.4 d. Given that the rotational period is nearly three times the planet ’ s orbital period , one would expect in an aligned system to see starspot occultation events to recur every three transits .
The absence of such occultation recurrences suggests a misaligned orbit unless the starspots ’ lifetimes are shorter than the star ’ s rotational period .
We also find stellar variability resembling \gamma Doradus pulsations in the lightcurve of WASP-118 , which hosts an inflated hot Jupiter .
The variability is multi-periodic with a variable semi-amplitude of \sim 200 ppm .
In addition to these findings we use the K2 data to refine the parameters of both systems , and report non-detections of transit-timing variations , secondary eclipses and any additional transiting planets .
We used the upper limits on the secondary-eclipse depths to estimate upper limits on the planetary geometric albedos of 0.7 for WASP-107b and 0.2 for WASP-118b .