Transit radius of CoRoT-2b as a function of age. The colored areas indicate constraints obtained from photometric, spectroscopic, radial-velocity data and stellar evolution models. The colors are a function of the distance to the effective temperature-stellar density constraint ellipse in standard error units: within 1σ (red), 2σ (yellow) and 3σ (blue). The star’s activity implies an age smaller than  ~0.5 Ga, which indicated by solutions in shades of grey. The main constraint is obtained for a lightcurve analysis that includes the presence of spots. An analysis that does not account for spots yields a  ~3% smaller radius, indicated by a dotted area (see text). The plain curves are obtained from standard evolution models using atmospheric boundary conditions that are parameterized by mean infrared κ_th and visible κ_v opacity coefficients, as in Fig. 11. The dashed and dotted curves are models from Leconte et al. (2009) and Gillon et al. (2010), respectively.