From top to bottom panels: generalised Lomb–Scargle periodograms of the K2 light curve, the RV measurements, BIS, FWFM of the correlation function, and the activity index where the last four are extracted from the FIES, HARPS, and HARPS-N data. The stellar period is indicated with the vertical dashed blue line, and the planet orbital period with the vertical dashed red line. The false-alarm probability (FAP) is indicated at the 1% level.