List of largest exoplanets

Below is a list of the largest exoplanets so far discovered, in terms of physical size, ordered by radius.

Image of the outer dust around the young star HD 100546. The position of HD 100546 b was indicated by an orange dot.

DiscrepancyEdit

This list of interstellar objects may and will change over time because of inconsistency between journals, different methods used to examine these objects and the already extremely hard task of discovering exoplanets, or any other large objects for that matter. Then there is the fact that these objects might be brown dwarves, or nothing at all. Because of this, this list only cites the best measurements to date and is prone to change. Remember, these objects are not stars, and are quite small on a universal or even stellar scale.

The ListEdit

The sizes are listed in units of Jupiter radii (RJ, R)(71,492 km). All planets listed are larger than two times the size of the largest planet in the Solar System, Jupiter. Some planets that are smaller than 1.7 RJ have been included for the sake of comparison.

Image Exoplanet name Radius (RJ)
(Jupiter = 1)
Notes
Sun (Sol) 9.95[1][2]
(695,700 km)
The largest object in the Solar System.
Reported for reference
  HD 100546 b 6.9+2.7
−2.9
[3]
Largest exoplanet in the NASA Exoplanet Archive, although because of flux from the planet and the disk that are superimposed, the exact size of this planet cannot be determined and the emitting area has this size, composed of the planet and most likely its disk too, and is not to be mistaken as a single planet radius. Over time, it will shrink to the size of Jupiter. Possessing 20 MJ, it is likely a brown dwarf.
  OTS 44 2.24[4]–5.55[5] Very likely a brown dwarf[4] or sub-brown dwarf[5], which it may be the least massive free-floating substellar objects. It is surrounded by a circumstellar disk of dust and particles of rock and ice.
  TYC 8998-760-1 b 3.0[6] On 22 July 2020, astronomers announced images, for the first-time, of multiple exoplanets orbiting a star, TYC 8998-760-1, nearly identical to the Sun, except for age. TYC 8998-760-1 is only 14 Ma old while the Sun is 4,500 Ma.[7][8]
  PDS 70 b 2.72+0.20
−0.17
[9]
DH Tauri b 2.6±0.7- 2.7±0.8[10] 11+10
−3
MJ; at its largest, it would be classified as a brown dwarf.
  ROXs 42Bb 2.5[11] This massive hot jupiter (9+6
−3
MJ) varies from 0.9 RJ to 3 RJ.[11]
Kepler-13 Ab (KOI-13b) 2.216±0.087[12] Lisa et al gives also radii of 1.512±0.035 RJ and 2.63+1.04
−0.82
 RJ. Natalie et al calculate 2.03 RJ.[13]
CT Chamaeleontis b 2.2+0.81
−0.6
[14]
17 MJ; is likely a brown dwarf.
KOI-368.01 2.1±0.2[15]
WASP-79b 2.09±0.14[16]
HAT-P-67b 2.085+0.096
−0.071
[17]
0.34+0.25
−0.19
MJ; a very puffy Hot Jupiter
XO-6b 2.07±0.22[18] 4.4 MJ; a very puffy Hot Jupiter
HAT-P-32b 2.037±0.999[18] 0.941 (± 0.166) MJ; a very puffy Hot Jupiter. Other estimates give 1.789±0.025 RJ.[19]
KOI-3681.01 2.0+0.7
−1
[15]
Orbits fairly close to its 1.1+0.2
−0.2
M star, with 217 day-long years.
  WASP-17b 1.991+0.08
−0.58
[20]
Was the largest known planet in 2012. At only 0.486 MJ, this Hot Jupiter is extremely low density. This estimate gives also a range from 1.411 RJ to 2.071 RJ.[20]
Kepler-435b 1.99±0.18[21]
KOI-680 b 1.99[15]
KELT-19 Ab 1.91[22]
CVSO 30b 1.91[23]
51 Pegasi b (Bellerophon) 1.9±0.3[24] First exoplanet to be discovered orbiting a main-sequence star. Prototype hot Jupiters.
  WASP-12b ("Pitch black") 1.900+0.057
−0.055
,[25] 1.736±0.056[26]
This planet is so close to its parent star that its tidal forces are distorting it into an egg shape. As of September 2017, it has been described as "black as asphalt", and as a "pitch black" hot Jupiter as it absorbs 94% of the light that shines on its surface.
KELT-9b 1.891+0.061
−0.055
[27]
One of the hottest exoplanets known.
HAT-P-65b 1.89±0.13[28]
WASP-121b 1.865±0.044[29]
KELT-8b 1.86+0.18
−0.16
[30]
HATS-23b 1.86+0.3
−0.4
[31]
WASP-76b 1.83+0.06
−0.04
[32]
The tidally-locked planet where winds move 18,000 km/h, and where molten iron rains from the sky due to daytime temperatures exceeding 2,400 °C (4,350 °F).[33][34]
HAT-P-33b 1.827±0.29[35]
  Cha 110913-773444 1.8[36] A rogue planet (Likely a sub-brown dwarf) that is surrounded by a protoplanetary disk. It is one of youngest free-floating substellar objects with 0.5–10 Myr.
GQ Lupi b 1.8 21.5 MJ; at the highest end of this range, it may be classified as a young brown dwarf.
TrES-4 1.799±0.063[37] This planet has a density of 0.2 g/cm3, about that of balsa wood, less than Jupiter's 1.3g/cm3.
WASP-122b 1.792±0.069[38]
KELT-12b 1.78+0.17
−0.16
[39]
HATS-26b 1.75±0.21[40]
KELT-14b 1.743±0.047[38]
KELT-20b 1.735+0.07
−0.075
[41]
HAT-P-40b 1.730±0.062[42]
WASP-94 Ab 1.72+0.06
−0.05
[43]
KELT-4 Ab 1.706+0.085
−0.076
[44]
WASP-88b 1.7+0.13
−0.07
[45]
WASP-78b 1.70±0.04[16]
1RXS 1609b 1.7[46] 14+2.0
−3.0
MJ; is likely a brown dwarf.

A few additional examples with radii lower than 1.7 RJ.

Exoplanet name Radius (RJ)
(Jupiter = 1)
Notes
Kepler-12b 1.695+0.032
−0.032
[47]
beta Pic b 1.65 Likely the second most massive object in its namesake system.
PSO J318.5-22 1.53 An extrasolar object that does not seem to be orbiting any stellar mass, see: rogue planet,
Kepler-7b 1.478
HD 209458 b 1.35 The first exoplanet whose size was determined. Named after a prominent Egyptian deity, 'Osiris'.
TrES-2b (Kepler-1b) 1.272 Darkest known exoplanet due to an extremely low geometric albedo. It absorbs 99% of light.
Kepler-39b 1.22 One of the most massive exoplanets known.
HR 2562 b 1.11 Most massive planet with a mass of 30 MJ, although according to most definitions of planet, it may be too massive to be a planet, and may be a brown dwarf instead.
Jupiter 69,911 km[48] Largest planet in the Solar System, by radius and mass.[49]
Reported for reference

See alsoEdit

ReferencesEdit

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