Is the exoplanet candidate 'Proxima c' potentially habitable?

As of April 2020, the exoplanet candidate Proxima c is not considered to be potentially habitable.

Firstly, Proxima c would orbit the star at a distance of 1.5 AU, whereas the habitable zone of the star system extends from 0.02 to 0.05 AU.

Secondly, it has been estimated that Proxima c has a mass 12 times higher than Earth, and the maximum mass for a planet to be considered potentially habitable is 10 Earth masses.

Thirdly, and this also applies to the other planet in that system: Proxima b, planets orbiting active flare stars should not be considered potentially habitable (for humans), especially if those stars are red dwarfs.

This is the first possible image of the closest exoplanet to Earth, Proxima c:



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