Normalized posterior distribution of the parameters fitted to the RV data. The distributions resulting from the analyses of the SOPHIE binned and unbinned observations are shown in red and black, respectively. The distributions resulting from the joint analysis combining the photometric (K2+TESS) and RV (SOPHIE+HIRES) observations are shown in yellow. Top: Five Keplerian parameters of planet b (T_0,b, P_b, K_b, e_b, ω_b) and V₀. Middle: 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: 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). For the latter, the values resulting from the analysis of the two SOPHIE nights of observation (Sect. 3.2.2) are shown for comparison (blue).