CI Tau is a young ( \sim 2 Myr ) classical T Tauri star located in the Taurus star forming region .
Radial velocity observations indicate it hosts a Jupiter-sized planet with an orbital period of approximately 9 days .
In this work , we analyze time series of CI Tau ’ s photometric variability as seen by K2 .
The lightcurve reveals the stellar rotation period to be \sim 6.6 d. Although there is no evidence that CI Tau b transits the host star , a \sim 9 d signature is also present in the lightcurve .
We believe this is most likely caused by planet-disk interactions which perturb the accretion flow onto the star , resulting in a periodic modulation of the brightness with the \sim 9 d period of the planet ’ s orbit .