Overview of the modeling of the stellar activity performed for the Case 1. Panel a shows the light curve (in gray) of the star obtained with TESS short cadence data; the model of the activity obtained with the GP fit is reported in red. The panel below is the plot of the residuals after the subtraction of the model to the light curve. Panels b and c represent the RV and log R′_HKseries of TOI-1807 (gray points): the stellar activity models are illustrated in red, while the residuals obtained after the subtraction of the model to the observed data are reported in the plots below each panel.