List of hottest exoplanets

This is a list of the hottest exoplanets so far discovered, specifically those with temperatures greater than 2500 K (2230 °C; 4040 °F) for exoplanets irradiated by a nearby star and greater than 2000 K (1730 °C; 3140 °F) for self-luminous exoplanets. For comparison, the hottest planet in the Solar System is Venus, with a temperature of 737 K (464 °C; 867 °F).

List of hottest exoplanets irradiated by a nearby star

Methods for finding temperature:

Image

(Or artistic representation)

Name Temperature (K) Mass Method Notes
KELT-9b4643±26[1]2.17±0.56 MJ[2]TeffHottest known exoplanet, with a temperature comparable to K-type stars.
55 Cancri e(Janssen)3771+669−520[3]7.99 M🜨[3]Hottest confirmed rocky exoplanet.
TOI-2109b3631±69[4]5.02±0.75 MJ[4]Has the shortest orbital period among the hot Jupiters in 0.6725 days (16.14 hours).[4]
BD-14 3065b3520±130[5]12.37±0.92 MJ[5]
WASP-189b3435±27[6]1.99+0.16−0.14 MJ[6]
TOI-1518b3237±59[7]<2.3 MJ[7]
WASP-103b3205±136[8]1.455+0.090−0.091 MJ[8]First exoplanet to have a deformation detected.[9] (see Jacobi ellipsoid)
KELT-16b3190±61[10]2.75 MJ[10]
WASP-12b3128±66[11]1.476+0.076−0.069 MJ[12]This planet is so close to its parent star that its tidal forces are distorting it into an egg shape. First planet observed being consumed by its host star;[13] it will be destroyed in 3.16 ± 0.10 Ma due to tidal interactions.[14][15]
WASP-33b3108±113[8]2.81±0.53 MJ[16]First planet discovered to orbit a Delta Scuti variable star
WASP-18b3067±104[8]10.20±0.35 MJ[8]
MASCARA-1b3062±67[17]3.7 MJ[17]
HATS-70b2730+140−160[18]12.9 MJ[18]Teq
WASP-100b2710[19]2.03 MJ[19]Teff
MASCARA-5b2700[20]3.12 MJ[20]
WASP-76b2670 (dayside)[21]0.92±0.032 MJ[22]A glory effect in the atmosphere of WASP-76b might be responsible for the observed increase in brightness of its eastern terminator zone which if confirmed, it would become the first exoplanet to have its glory-like phenomenon to be discovered.[23][24]
HAT-P-7b2667±57[25]1.806±0.036 MJ[26]First exoplanet to have a crude map of cloud coverage
TOI-2260 b2609±86[18]0.011 +0.0079−0.0041MJ[27]Teq
HAT-P-70b2562+43−52[18]6.78 MJ[18]Teq
Kepler-13b2550±80 (2277 °C)[18]9.28(16) MJ[28]Discovered by Kepler in first four months of Kepler data.[29]
The following well-known planets are listed for the purpose of comparison.
Kepler-10b2130+60−120 (1857 °C)[30]3.58±0.33 M🜨[31]TeqFirst confirmed terrestrial planet to have been discovered outside the Solar System
TrES-4b1782±29 (1509 °C)[32]0.78±0.19 MJ[33]Largest confirmed exoplanet ever found at the time of discovery.[34] This planet has a density of 0.17 g/cm3, comparable to that of balsa wood, less than Saturn's 0.7 g/cm3.[35]
CoRoT-7b1756±27 (1483 °C)[36]5.74 M🜨[36]Smallest exoplanet to have its diameter measured at the time of discovery and first potential extrasolar terrestrial planet to be found.
Upsilon Andromedae b(Saffar)1673 (1400 °C)[37]1.70+0.33−0.24 MJ[38]TeffFirst multiple-planet system to be discovered around a main-sequence star, and first multiple-planet system known in a multiple-star system.
WASP-17b(Ditsö̀)1550+170−200 (1277 °C)[26]0.512±0.037 MJ[26]With a density of about 0.08 g/cm3,[39] it is one of the puffiest exoplanets known.
HD 209458 b("Osiris")1499±15 (1226 °C)[40]0.682+0.014−0.015 MJ[26]Represents multiple milestones in exoplanetary discovery, such as the first exoplanet known observed to transit its host star, the first exoplanet with a precisely measured radius, one of first two exoplanets (other being HD 189733 Ab) to be observed spectroscopically[41][42] and the first to have an atmosphere detected, containing evaporating hydrogen, and oxygen and carbon. First extrasolar gas giant to have its superstorm measured.[43] Also first (indirect) detection of a magnetic field on an exoplanet.[44] Nicknamed "Osiris".
TrES-2b1466±9 (1193 °C)[45]1.253 MJ[45]TeqThe darkest exoplanet known, reflecting less than 1% its star's light.
51 Pegasi b(Dimidium)1265 (992 °C) 0.46+0.06−0.01 MJ[46]TeqThe first exoplanet discovered orbiting a main-sequence star.
Kepler-20e1004±14 (735 °C)[47]<0.76 M🜨[47]The first planet smaller than Earth discovered after PSR B1257+12 b.
Venus(for reference)735 (462 °C)[48]0.815 M🜨[48]Hottest planet in the Solar System.

List of hottest self-luminous exoplanets

All these are measured temperatures.

Image(Or artistic representation) Name Temperature (K) Mass (MJ) Notes
HIP 78530 b2700±100[49]28 ± 10[50]Likely a brown dwarf.
GQ Lupi b2650±100[51]~ 20 (1 – 39)[51]Likely a brown dwarf. First confirmed exoplanet candidate to be directly imaged.
CT Chamaelontis b(CT Cha b)2600±250[52]17 ± 6[52]Likely a brown dwarf. Furthest planet to be directly imaged at the distance of 622 ly (190.71 pc).
DH Tauri b2400±100[53]11 ± 3[53]First planet to have a confirmed circumplanetary disk[54] and youngest confirmed planet at an age of 0.7 Myr.[55]
The following well-known planets are listed for the purpose of comparison.
Beta Pictoris b1724±15 (1451 °C)[56]11.729 +2.337−2.135[57]First exoplanet to have its rotation rate measured[58] and fastest-spinning planet discovered at the equator speed of 19.9 ± 1.0 km/s (12.37 ± 0.62 mi/s) or 71,640 ± 3,600 km/h (44,520 ± 2,240 mph).[59]

Unconfirmed candidates

These planet candidates have not been confirmed.

Image

(Or artistic representation)

Name Temperature (K) Mass Method
Kepler-70b7662[a]0.44 M🜨Teq
Kepler-70c6807[b]0.655 M🜨
WD 2226-210 b4970[60]
Vega b3250[61][c]21.9 M🜨

Notes

  1. ^Assuming albedo of 0.1
  2. ^Assuming albedo of 0.1
  3. ^Assuming bond albedo of 0.25

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