Overview of potentially habitable terrestrial exoplanets
This is a
list of potentially habitable exoplanets
. The list is mostly based on estimates of habitability by the Habitable Worlds Catalog (HWC), and data from the
NASA Exoplanet Archive
. The HWC is maintained by the
Planetary Habitability Laboratory
at the
University of Puerto Rico at Arecibo
.
[1]
There is also a speculative list being developed of
superhabitable planets
.
Surface
planetary habitability
is thought to require an orbit at the right distance from the host star for liquid surface water to be present, in addition to various
geophysical
and
geodynamical
aspects, atmospheric density, radiation type and intensity, and the host star's
plasma
environment.
[2]
List
[
edit
]
This is a list of
exoplanets
within the
circumstellar habitable zone
that are under 10 Earth masses and smaller than 2.5 Earth radii, and thus have a chance of being
rocky
.
[3]
[1]
Note that inclusion on this list does not guarantee habitability, and in particular the larger planets are unlikely to have a rocky composition.
[4]
Earth is included for comparison.
Note that mass and radius values prefixed with "~" have not been measured, but are estimated from a mass-radius relationship.
Previous candidates
[
edit
]
Some exoplanet candidates detected by
radial velocity
that were originally thought to be potentially habitable were later found to most likely be artifacts of stellar activity. These include
Gliese 581 d
&
g
,
[49]
[50]
[51]
Gliese 667
Ce & f,
[12]
[52]
Gliese 682
b & c,
[7]
Kapteyn b
,
[53]
[54]
and
Gliese 832 c
.
[55]
HD 85512 b
was initially estimated to be potentially habitable,
[56]
[57]
but updated models for the boundaries of the habitable zone placed the planet interior to the HZ,
[58]
[59]
and it is now considered non-habitable.
[1]
Kepler-69c
has gone through a similar process; though initially estimated to be potentially habitable,
[60]
it was quickly realized that the planet is more likely to be similar to Venus,
[61]
and is thus no longer considered habitable.
[1]
Several other planets, such as
Gliese 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 e
and
f
were initially both considered potentially habitable,
[62]
but with improved models of the circumstellar habitable zone, as of 2022 PHL does not consider either planet potentially habitable.
[1]
[
failed verification
]
Kepler-438b
was also initially considered potentially habitable; however, it was later found to be a subject of powerful flares that can strip a planet of its atmosphere, so it is now considered non-habitable.
[1]
K2-3d
and
K2-18b
were originally considered potentially habitable, and the latter remains listed in the HEC,
[1]
but recent studies have shown them to be gaseous
sub-Neptunes
and thus unlikely to be habitable.
[63]
[64]
[65]
[66]
[67]
[68]
KOI-1686.01 was also considered a potentially habitable exoplanet after its detection in 2011, until proven a false positive by
NASA
in 2015.
[69]
Several other KOIs, like
Kepler-577b
and
Kepler-1649b
, were considered potentially habitable prior to confirmation, but with new data are no longer considered habitable.
See also
[
edit
]
References
[
edit
]
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10.3847/1538-3881/aaf79c
.
S2CID
119440420
.
- ^
Benneke, Bjorn; et al. (2019).
"Water Vapor and Clouds on the Habitable-zone Sub-Neptune Exoplanet K2-18b"
.
The Astrophysical Journal
.
887
(1): L14.
arXiv
:
1909.04642
.
Bibcode
:
2019ApJ...887L..14B
.
doi
:
10.3847/2041-8213/ab59dc
.
S2CID
209324670
.
- ^
"Kepler Candidate Overview Page: KOI-1686.01"
.
NASA Exoplanet Archive
. NASA Exoplanet Science Institute
. Retrieved
28 December
2015
.
External links
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