GJ 720 A CARMENES RVs. Top panel: RV time series (blue dots) together with the best model and the residuals. The fitted model (black line) corresponds to the base model plus an exp-sin-squared GP kernel that models the stellar activity at P_rot =35.23 ± 0.11 days, and the planetary signal at 19.466 ± 0.005 days. The GP contribution is shown as the red line. The error bars (blue) include the RV jitter (light blue) taken into account. Bottom panel: RVs (blue dots) folded in phase (the base model and the stellar activity were removed) with the orbital period of the planet and its residuals. The best Keplerian solution (black line) has an RV amplitude of 4.72 ± 0.27 m s⁻¹. The red dots correspond to the binned data. The rms of the residuals is 1.59 m s ⁻¹.