GLS periodograms of the spectroscopic time series from HARPS-N data. The window function is depicted on the top panel while the periodograms of the RVs, the corresponding residuals, the bisector, the log R′_HK and the Hα time series are reported in the following panels. The orange vertical lines represent the location of the rotation period (solid) and its first harmonic (dashed), while the cyan solid line indicates the position of the planet orbital period.