Top panel: Lomb-Scargle periodogram of the complete light curve. Middle panel: Lomb-Scargle periodogram obtained from 67-day chunks of the light curve. Bottom panel: light curve autocorrelation. The green dotted lines indicate the center of Gaussians fitted to the data to derive the main frequency and its harmonics. The vertical red line corresponds to the rotation period deduced from the v sin i and the star’s radius, assuming the star’s rotation axis is perpendicular to the line of sight, and the shaded areas are the associated 1σ, 2σ, and 3σ upper limit regions from the darkest to the lightest one.