Iterative search of signals with Bayesian periodograms using SPIRou data of Gl 382. The top four panels display log BF periodograms for (a) raw data, (b) Wapiti correction, and (c) stellar activity correction. The dashed green lines in the bottom panel mark periodicities at the stellar rotation period (P_rot), at the one-half rotation period (P_rot/2), and at the 51 d period. The significance level of log BF = 5 is indicated by the horizontal red dashed line. The bottom left panel shows the stacked periodogram with log BF power values, where log BF values below 5 are in gray. The bottom right panel presents the variation in log BF as a function of the number of observations for the most significant period at 51 d.