List of potentially habitable exoplanets

The following list includes some of the potentially habitable exoplanets discovered so far. It is mostly based on estimates of habitability by the Habitable Worlds Catalog (HWC), and data from theNASA Exoplanet Archive.The HWC is maintained by thePlanetary Habitability Laboratoryat theUniversity of Puerto Rico at Arecibo.[1]There is also a speculative list being developed ofsuperhabitable planets.

Surfaceplanetary habitabilityis thought to require an orbit at the right distance from the host star for liquid surface water to be present, in addition to variousgeophysicalandgeodynamicalaspects,atmosphericdensity, radiation type and intensity, and the host star'splasmaenvironment.[2]

List

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This is a list of confirmedexoplanetswithin thecircumstellar habitable zonethat are either under 10 Earth masses or smaller than 2.5 Earth radii, and thus have a chance of beingrocky.[3][1]Note that inclusion on this list does not guarantee habitability, and in particular the larger planets are more unlikely to have a rocky composition.[4]Earth is included for both comparison and reference, while Venus and Mars are included for reference only.

Note that mass and radius values prefixed with "~" have not been measured, but are estimated from the mass-radius relationship.

Current candidates

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This is a list of notable exoplanets within thecircumstellar habitable zonethat are either under 10 Earth masses or smaller than 2.5 Earth radii and havenotyet been confirmed. Earth is included for both comparison and reference, while Venus and Mars are included for reference only.

Previous candidates

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Some exoplanet candidates detected byradial velocitythat were originally thought to be potentially habitable were later found to most likely be artifacts of stellar activity. These includeGliese 581 d&g,[68][69][70]Gliese 667Ce & f,[14][71]Gliese 682b & c,[52]Kapteyn b,[72][73]andGliese 832 c.[74]

HD 85512 bwas initially estimated to be potentially habitable,[75][76]but updated models for the boundaries of the habitable zone placed the planet interior to the HZ,[77][78]and it is now considered non-habitable.[1]Kepler-69chas gone through a similar process; though initially estimated to be potentially habitable,[79]it was quickly realized that the planet is more likely to be similar to Venus,[80]and is thus no longer considered habitable.[1]Several other planets, such asGliese 180 b,also appear to be examples of planets once considered potentially habitable but later found to be interior to the habitable zone.[1]

Similarly,Tau Ceti ewas thought to be likely habitable,[81]but with improved models of the circumstellar habitable zone, as of 2022 PHL does not consider it potentially habitable.[1][failed verification]Kepler-438bwas also initially considered potentially habitable; however, it was later found to be a subject of powerfulflaresthat can strip a planet of its atmosphere, so it is now considered non-habitable.[1]

K2-3dandK2-18bwere originally considered potentially habitable, and the latter remains listed in the HEC,[1]but recent studies have shown them to be gaseoussub-Neptunesrather than being theHycean planetsand thus unlikely to be habitable.[82][83][84][85][86][87]

Kepler-1638bwas thought to be a possibly habitable planet with a radius smaller than2R🜨after the validation. However based on the later measurement of host star parallax byGaia,the radius of the planet was revised upward to3.226+0.201
−0.315
R🜨
,resulting in it being aice giantlike Neptune with poor prospect for habitability.[88][89]

KOI-1686.01 was also considered a potentially habitable exoplanet after its detection in 2011, until proven a false positive byNASAin 2015.[90]Several other KOIs, likeKepler-577bandKepler-1649b,were considered potentially habitable prior to confirmation, but with new data are no longer considered habitable.

See also

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References

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