Cooling tracks and isochrones inferred from the planetary luminosity. The colored lines show 50 random samples from the posterior distributions. The best-fit model is shown with the dashed line in each panel. The crosses represent the luminosity of HD 135344 Ab, log L/L_⊙ = −3.9 ± 0.1, and the horizontal error bars indicate the prior age and posterior mass in the top and bottom panel, respectively.