Analysis of the ESPRESSO S_MW, Hα and Na I spectroscopic indexes, a, b: S_MW, Hα and Na I-index time-series with the best-model fit. The data is split into two panels because of a large period with no observations between the two campaigns. The shaded area shows the variance of the GP model, c: GLS periodogram of the S_MW, Hα and Na I-index data. The red vertical dashed line shows the most significant period, d: Relationship between the S_MW, Hα and Na I-index data. The best fit is shown when the slope is ≥3σ different from zero, e, f: Residuals of the S_MW, Hα and Na I-index after subtracting the best model fit. g: GLS periodogram of the residuals, h: Comparison of the CCF RV and gradient of the S_MW, Hα and Na I-index model.