Posterior distribution of the η₃ hyperparameter of the quasiperiodic GP kernel used to describe the ESPRESSO activity indicators (Sect. 4.3). The vertical dash-dotted black line indicates the orbital period of Candidate#l and the vertical blue shade indicates its 3σ confidence interval. The vertical grey shade represents the lσ confidence interval of the expected P_rot, inferred through the ($R{\text{'}}_{HK}$)-P_rot relations from Suárez Mascareño et al. (2016). In the H_α panel, the vertical dashed and dotted brown lines indicate the median value and the 1σ confidence intervals of the distribution, respectively (${\eta }_{3,H_{\alpha }}={37.03}_{-0.92}^{+1.25}$ d).