Habitable exoplanet


A potentially habitable exoplanet is a hypothetical type of planet that could be habitable for humans.
As of March 2020, a total of 55 potentially habitable exoplanets have been found.
Of those, one is believed to be Sub-terran, 20 Terran and 34 Super Terran. The most potentially habitable exoplanet discovered so far is Teegarden b, with an Earth Similarity Index of 0.93. The main feature of potentially habitable exoplanets is that they have to be located in the habitable zone of their stellar systems.

Characteristics

Mass

In order to be potentially habitable, an exoplanet would have to have a mass between 0.1 and 10 Earth masses.

Radius

The radius of a habitable exoplanet would range between 0.5 and 2.5 Earth radii.

Temperature

The temperature among the habitable exoplanets discovered so far range from 182 degrees Kelvin and 285 degrees Kelvin.

Host star

It is believed that F, G, K and M-type star could host habitable exoplanets. G-type stars would allow to host the exoplanets most similar to Earth, that is, Earth-like planets. K-type stars would provide the necessary conditions for super habitable exoplanets, which are exoplanets that could be more habitable than Earth. As of March 2020, only one potentially habitable exoplanet has been found orbiting a F-type star: Kepler-1632 b.
M-type stars also considered possible hosts of habitable exoplanets, even those with flares such as Proxima b. However, it is important to bear in mind that flare stars could greatly reduce the habitability of exoplanets by eroding their atmosphere.