Derived correlation plots and posterior probability distributions of the transit parameters of WASP-103b for the spherical (red) and ellipsoidal model (blue). The vertical lines show the median of the distributions and the shaded area shows the 68% confidence intervals. We show the 1 σ (dark blue and dark red) and 2 σ (light blue and light red) contours. We obtained a 3 σ detection of the Love number. The parameter distributions also clearly show that the ellipsoidal model is not as well constrained as the spherical model due to strong correlations between the Love number and the radius ratio. For the ellipsoidal model, the radius ratio refers to the volumetric radius. The superscripts sp1, sp2, ch, and hst refer to the two Spitzer channels, CHEOPS, and HST, respectively.