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The recent discovery of potentially habitable exoplanets around ProximaCentauri and TRAPPIST-1 has attracted much attention due to their potential forhosting life. We delineate a simple model that accurately describes theevolution of biological diversity on Earth. Combining this model withconstraints on atmospheric erosion and the maximal evolutionary timescalearising from the star's lifetime, we arrive at two striking conclusions: (i)Earth-analogs orbiting low-mass M-dwarfs are unlikely to be inhabited, and (ii)K-dwarfs and some G-type stars are potentially capable of hosting more complexbiospheres than the Earth. Hence, future searches for biosignatures may havehigher chances of success when targeting planets around K-type stars.

Reduced Diversity of Life Around Proxima Centauri and TRAPPIST-1