Photometric variability attributed to stellar rotation as fitted by the Gaussian process. The upper panel shows in blue the time series corrected for instrumental systematics and the planet model, including transit, eclipse, and phase-curve signal. The residuals of the best-fit are represented in the lower panel (blue points). The data points binned once per CHEOPS orbit are shown in black. The faded orange lines are GP models sampled from the posterior distribution highlighting the uncertainty of the fit. The vertical dotted lines mark the time interval of the planetary transits (red) and eclipses (green).