Mass evolution for the different scenarios for an initial mass of 1 M_J, assuming a constantly high activity level. Solid lines indicate the models with an eccentricity 0.0 and a density of 1 g cm^-3 (model 1: 0.3 M_⊙ + 0.3 M_⊙. Model 2: 0.5 M_⊙ + 1.0 M_⊙. Model 3: 1 M_⊙ + 1 M_⊙). The effects on an Earth-like planet would be devastating even if it orbits a two M-star system. Dotted lines are used for variations of density and eccentricity in model 3. A higher density (Earth density is 5.5 g cm^-3) protects the planet against photoevaporation. A dashed line indicates the evolution with the usual activity decay over time of single stars.