In a 1 Nov 2017 paper on arXiv, Manasvi Lingam and Abraham Loeb of the
Harvard-Smithsonian Center for Astrophysics provide their analysis
of the habitability of Earth-analogs around stars of different masses.
Quote:
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Originally Posted by Manasvi Lingam, Abraham Loeb
We consider the habitability of Earth-analogs around stars of different masses, which is regulated by the stellar lifetime, stellar wind-induced atmospheric erosion, and biologically active ultraviolet (UV) irradiance. By estimating the timescales associated with each of these items, we show that they collectively impose limits on the habitability of Earth-analogs. We conclude that planets orbiting most M-dwarfs are not likely to host life, and that the highest probability of complex biospheres is for planets around K- and G-type stars. Our analysis suggests that the current existence of life near the Sun is slightly unusual, but not significantly anomalous.
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Paper here :-
https://arxiv.org/pdf/1710.11134.pdf