Fit and residuals of the white-light data. Top: the best-fit model (solid red line) obtained from the combined data of the nights observed with ESPRESSO. Bottom: residuals after subtracting the model. The darker orange areas represent the phases where the planet is fully inside the stellar disk, while the lighter orange regions correspond to the ingress and egress phases. The data points are represented with two error bars. The green error bar is computed from the CCF, assuming a photon-noise-limited observation. The black error bar is obtained by adding in quadrature the value of the green error bar and the jitter amplitude. At the top of the bottom figure, two quantities are presented. The first is the average dispersion of the residual RVs (σ_res) in units of m s⁻¹. The second is the average value of the black error bars, also given in m s⁻¹.