Planetary Lyα absorption in R_p,Lyα/R_star integrated inthe [−215,−91] km s⁻¹ velocity range as a function of stellar XUV flux (at 1 AU; x-axis) and input stellar mass-loss rate (left y-axis). Red circles indicate the results obtained with a SW temperature and terminal velocity of 0.64 MK and 400 km s⁻¹, respectively. Blue circles are for a SW temperature and terminal velocity of 1.2 MK and 800 km s⁻¹, respectively.The size of the red circles is proportional to the planetary absorption, whose value is given beside each circle. For a comparison with the observations, the green solid lines show the approximate position of the 0.13 and 0.24 absorption levels with respect to the results given by the red circles. The gray curve gives the planetary mass-loss rate (right y-axis) obtained from the simulations as a function of stellar XUV flux in the case of the slow SW. The planetary mass-loss rate is very weakly dependent of the stellar mass-loss rate (see Sect. 4).