Fig. 10
Temporal evolution of the TOI-402 planets. The panels show as a function of time (a) the transit radius (in Earth radii), (b) the mass of the H/He envelope (in Earth masses), (c) the mean density of the planets, and (d) the XUV-driven hydrodynamic H/He evaporation rate. In the two panels on the left, the horizontal lines show the observed values and the 1-σ error intervals. The yellow region indicates the 1-σ age range of the star, with the vertical grey line showing the nominal age of 7.5 Gyr.
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