Normalized posteriors distribution of the parameters fitted to the RV data. The distributions resulting from the analyses of the SOPHIE binned observations are shown in magenta (C1), pink (C2), and red (C1+C2). The distributions corresponding to the analyses of the unbinned data are shown in blue (C1), cyan (C2), and black (C1+C2). The distributions resulting from the joint analysis combining the photometric (K2+TESS) and nonbinned RV (SOPHIE+HIRES) observations are shown in yellow (benchmark). Top: the five Keplerian parameters of planet b (T_0,b, P_b, K_b, e_b, ω_b), and V₀. Middle: the five Keplerian parameters of the candidate planet (T_0,c, P_c, K_c, e_c, ω_c), and the RV jitter (σ_SOPHIE). Bottom: the GP hyperparameters of the stellar magnetic activity model (P_rot, α_QP, λ_1,QP, λ_2,QP), and the short-term stellar noise model (α_SE,/λ_SE).