J1219–39: the central panels show posterior probability-density distributions from the MCMC output, with contours at the 1-, 2- and 3-σ confidence regions. The side panels show marginalised distributions as histograms in black. Where used, the priors are shown in grey. Panel a) radius and mass of J1219–39b. b) modified Hertzsprung-Russell diagram over-plotted with the Geneva evolution tracks. Masses are indicated in M_⊙. c) V   sin   i_⋆ versus β from fitting the Rossiter-McLaughlin effect. d) the eccentricity e and argument of periastron ω.