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Fig. 4

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Analysis of the FWHM of the ESPRESSO CCF. Panels a and b: FWHM 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. Panel c: GLS periodogram of the CCF FWHM data. The red vertical dashed line shows the most significant period. Panel d: relationship between the CCF RV and CCF FWHM data. The best fit is shown when the slope is ≥3σ different from zero. Panels e and f: residuals of the CCF FWHM after subtracting the best model fit. Panel g: GLS periodogram of the residuals. Panel h: comparison of the CCF RV and gradient of the CCF FWHM model.

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