Evolution of the HZ inner edge, bolometric luminosity and XUV luminosity for Proxima. Top panel: evolution of the inner edge of the HZ for two different assumptions: S_p = 0.9S_⊕ (dashed blue line), S_p = 1.5S_⊕ (full blue line). The full black line corresponds to Proxima’s measured orbital distance. Bottom panel: evolution of the luminosity for a 0.1M_⊙ star (in orange), for 0.2 M_⊙ (in red) and 0.123 M_⊙ (in blue). The gray area corresponds to the observed value (see Table 1). The black vertical dashed line corresponds to the estimated age of Proxima.