This list of extrasolar objects may and will change over time due to diverging measurements published between scientific journals, varying methods used to examine these objects, and the notably difficult task of discovering extrasolar objects in general. These objects are not stars, and are quite small on a universal or even stellar scale. Furthermore, these objects might be brown dwarfs, sub-brown dwarfs, or not even exist at all. Because of this, this list only cites the most certain measurements to date and is prone to change.
Different space organisations have different maximum masses for exoplanets. The NASA Exoplanet Archive (NASA EA) states that an object with a minimum mass lower than 30 MJ, not being a free-floating object, is qualified as an exoplanet.[5] On the other hand, the official working definition by the International Astronomical Union (IAU) allows only exoplanets with a maximum mass of 13 MJ, that are orbiting a host object at a mass ratio of less than 0.04.[6][7] For the purpose of the comparison of large planets, this article includes several of those listed by NASA EA up to the maximum 30 MJ with possible brown dwarfs among them of ≳ 13 MJ as stated by IAU.[8]
Classification of Sub-brown Dwarf and Rogue Objects
Sub-brown dwarfs are formed in the manner of stars, through the collapse of a gas cloud (perhaps with the help of photo-erosion) but that has a planetary mass, therefore by definition below the limiting mass for thermonuclear fusion of deuterium (~ 13MJ).[7] However, there is no consensus amongst astronomers on whether the formation process should be taken into account when classifying an object as a planet.[9] Free-floating sub-brown dwarfs can be observationally indistinguishable from rogue planets, which originally formed around a star and were ejected from orbit. Similarly, a sub-brown dwarf formed free-floating in a star cluster may be captured into orbit around a star, making distinguishing sub-brown dwarfs and large planets also difficult. A definition for the term "sub-brown dwarf" was put forward by the IAU Working Group on Extra-Solar Planets (IAU WGESP), which defined it as a free-floating body found in young star clusters below the lower mass cut-off of brown dwarfs.[10]
The sizes are listed in units of Jupiter radii (RJ, 71 492 km). This list is designed to include all exoplanets that are larger than 1.6 times the size of Jupiter. Some well-known exoplanets that are smaller than 1.6RJ (17.93R🜨 or 114387km) and are gas giant have been included for the sake of comparison. For the exoplanets with uncertain radii that could be below or above the adopted cut-off of 1.6 RJ, see the list of exoplanets with uncertain radii.
Key (Classification)
*
Probably brown dwarfs (≳ 13 MJ) (based on mass)
†
Probably sub-brown dwarfs (≲ 13 MJ) (based on mass and location)
?
Status uncertain (inconsistency in age or mass of planetary system)
!
Uncertain status while probably brown dwarfs (≳ 13 MJ)
‽
Uncertain status while probably sub-brown dwarfs (≲ 13 MJ)
←
Probably exoplanets (≲ 13 MJ) (based on mass)
→
Planets with grazing transit, hindering radius determination
First confirmed exoplanet candidate to be directly imaged. It is believed to be several times more massive than Jupiter. Because the theoretical models which are used to predict planetary masses for objects in young star systems like GQ Lupi b are still tentative, the mass cannot be precisely determined, giving the masses of 1 – 39 MJ;[30] in the higher half of this range, it may be classified as a young brown dwarf. It should not be confused with the star GQ Lup C (2MASS J15491331), 2400 AU away, sometimes referred to as GQ Lup B.[31] Other sources of the radius include 3.7 ± 0.7 RJ,[32] 3.0 ± 0.5 RJ,[30] 3.77 RJ,[33] 3.5 +1.50 −1.03RJ,[34] 4.6 ± 1.4 RJ, 6.5 ± 2.0 RJ.[35]
Sometimes the initially reported 6.9 +2.7 −2.9RJ for the emitting area due to the diffuse dust and gas envelope or debris disk surrounding the planet[39] is confused with the actual radius. HD 100546 is the closest planetary system that contains a Herbig Ae/Be star.[40]
Responsible for the most powerful stellar flare so far observed. Its fast rotation, with its convective interior, produces a powerful magnetic field that is believed to play a role in the star's ability to produce such flares.[43] Reported for reference.
First discoveredrogue planet, and the coolest and faintest object in Chamaeleon I as well as the least massive known member of the cluster at the time of confirmation;[46] very likely a brown dwarf[47] or sub-brown dwarf.[48] It is surrounded by a circumstellar disk of dust and particles of rock and ice. The currently preferred radius estimate is done by SED modelling including substellar object and disk model.[44]
Based on the mass ratio to 2M J044145 A(2M 0441+23 Aa) it is likely not a planet according to the IAU's exoplanet working definition.[7] Part of the lowest mass quadruple 2M 0441+23 system of 0.26 M☉.[52]
The closest halo star and nearest redsubdwarf, at the distance of 12.82 ly (3.93 pc), and second-highest proper motion of any stars of more than 8 arcseconds per year (after the Barnard's Star). Age: 11.5 +0.5 −1.5Gyr.[54] Reported for reference.
More likely a (proto-)brown dwarf. Assuming a hot-start evolution model and a planetary mass, AB Aurigae b would be younger than 2 Myr to have its observed large luminosity, which is inconsistent with the age of AB Aurigae of 6.0 +2.5 −1.0Myr, which could be caused by delayed planet formation in the disk.[58] Other system ages include 1 - 5 Myr,[56] 4 ± 1 Myr[59] and 4 Myr.[60] Another source gives a higher mass of 20 MJ in the brown dwarf regime for an age of 4 Myr, arguing since gravitational instability of the disk (preferred formation mechanism in the discovery publication)[56] operates on very short time scales, the object might be as old as AB Aur.[57] A more recent study also support the latter source, given the apparent magnitude was revised upwards.[61]
Likely a brown dwarf[63] or a planetary mass companion.[64] The NASA Exoplanet Archive considers it as an exoplanet, the most distant to be directly imaged at the distance of 622 ly (190.71 pc).[65]
The mass ratio between HIP 79098 b and the central binary HIP 79098 AB is estimated at 0.3–1%. The value lower than 4% suggests that HIP 79098 b represents the upper end of the planet population, as opposed to having been formed as a star.[70]
Second eclipsing binaryred dwarf system discovered after YY Geminorum(Castor Cab).[72] One of the lightest stars with precisely measured masses and radii, orbiting around 1.268 days. The members of Gliese 630.1 triple system. Age: 4.1 ± 0.8 Gyr.[73] Reported for reference.
Second eclipsing binaryred dwarf system discovered after YY Geminorum(Castor C).[72] One of the lightest stars with precisely measured masses and radii, orbiting around 1.268 days. The members of Gliese 630.1 triple system. Age: 4.1 ± 0.8 Gyr.[73] Reported for reference.
A very puffy Hot Jupiter which is among planets with lowest densities of ~0.061 g/cm3. Largest known planet with a precisely measured radius, as of 2025.[87]
The formation is unclear; ROXs 42Bb may formed via core accretion, by disk (gravitational) instability, or more like a binary star. Older estimates include 1.9 – 2.4, 1.3 – 4.7 RJ[90] and 2.43±0.18, 2.55±0.2 RJ.[91] Other sources of masses include 3.2 – 27 MJ,[92] 9 +6 −3MJ,[93] 10 ± 4 MJ.[94]
A rogue planet/sub-brown dwarf that is surrounded by a protoplanetary disk, the first one to be confirmed. It is one of youngest free-floating substellar objects with 0.5–10 Myr. The currently preferred radius estimate is done by SED modelling including substellar object and disk model.[44]
In a binary with a smaller 1.7RJ proto-rogue planet/brown dwarf. It is not clear how proto-brown dwarfs J041757 AB are formed; the observations of the outflow momentum rate of these two proto-BD candidates suggest they formed as a scaled-down version of low-mass stars.[117]
This planet is so close to WASP-12 A that its tidal forces are distorting it into an egg-like shape.[132] First planet observed being consumed by its host star;[133] it will be destroyed in 3.16 ± 0.10 Ma due to tidal interactions.[134][135] WASP-12b is suspected to have one exomoon due to a curve of change of shine of the planet observed regular variation of light.[136]
Discovered by Kepler in first four months of Kepler data.[140] A more recent analysis argues that a third-light correction factor of 1.818 is needed, to correct for the light blending of Kepler-13 B, resulting in higher radii results.[138]
Hottest confirmed exoplanet, with a temperature of 4050±180 K (3777 ± 180 °C; 6830 ± 324 °F).[143] First exoplanet with detection of the rare-earth element terbium in atmosphere.[144]
Its formation as an exoplanet is challenging or impossible.[126] If its formation scenario is known, it may explain the formation of Planet Nine. Planetary migration may explain its formation, or it may be a sub-brown dwarf. Other sources of mass includes 4.1 – 11.6 MJ.[126]
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 glory-like phenomenon to be discovered on an exoplanet.[153][154] WASP-76b is suspected to have an exomoon analogue to Jupiter's Io due to the detection of sodium via absorption spectroscopy.[155]
Most likely a brown dwarf. Because HIP 78530 b's characteristics blend the line between whether or not it is a brown dwarf or a planet, astronomers have tried to determine what HIP 78530 b is by predicting whether it was created in a planet-like or star-like manner.[163]
Due to high level of jitter, it is difficult to constrain both planets' eccentricities with accuracy. Most of their defined characteristics are based on the assumption that HAT-P-32b and HAT-P-33b have their elliptical orbits, although their discoverers have also derived the planets' characteristics on the assumption that they have their circular orbits. The elliptical model has been chosen because it is considered to be the more likely scenario.[164]
Radius estimated using the phase curve of reflected light. The planet orbits very close to Titawin(υ And A) at the distance of 0.0595 AU, completing an orbit in 4.617 days.[179] First multiple-planet system to be discovered around a main-sequence star, and first multiple-planet system known in a multiple-star system.
First exoplanet found to contain water on its stratosphere. Tylos is suspected to have an exomoon analogous to Jupiter's Io due to the detection of sodium absorption spectroscopy around it.[183]
This planet orbits its host star nearly over poles, misalignment between the orbital plane and equatorial plane of the star been equal to 104 ± 2°[185]
First planet discovered to have a retrograde orbit[196] and first to have quartz (crystalline silica, SiO2) in its clouds.[197]Has an exteremely low density of 0.08 g/cm3,[196] the lowest of any exoplanet when it was discovered, and was possibly the largest exoplanet at the time of discovery, with a radius of 1.92RJ.[198]
First exoplanet found to have its orbit flipped (obliquity of 155 +17 −21°) due to constraints on stellar rotational velocity, sky-projected obliquity and limb-darkening coefficients (see Kozai–Lidov mechanism).[199]
In a binary with a larger 2RJ proto-rogue planet/brown dwarf. It is not clear how proto-brown dwarfs J041757 AB are formed; the observations of the outflow momentum rate of these two proto-BD candidates suggest they formed as a scaled-down version of low-mass stars.[117]
Thought to be the lightest known exoplanet at the time of announcement orbiting its host at a large separation of 330 AU and third announced directly imaged exoplanet orbiting a sun-like star (after GQ Lup b and AB Pic b). 1RXS 1609 b's location far from 1RXS 1609 presents serious challenges to current models of planetary formation: the timescale to form a planet by core accretion at this distance from the star would be longer than the age of the system itself. One possibility is that the planet may have formed closer to the star and migrated outwards as a result of interactions with the disk or with other planets in the system. An alternative is that the planet formed in situ via the disk instability mechanism, where the disk fragments because of gravitational instability, though this would require an unusually massive protoplanetary disk.[210] With the upward revision in the age of the Upper Scorpius group from 5 million to 11 million years, the estimated mass of 1RXS J1609b is approximately 14 MJ, i.e. above the deuterium-burning limit.[212] An older age for the J1609 system implies that the luminosity of J1609b is consistent with a much more massive object, making more likely that J1609b may be simply a brown dwarf which formed in a manner similar to that of other low-mass and substellar companions.[211]
The formation is unclear. The high accretion is in better agreement with a formation via disk fragmentation, hinting that it might have formed from a circumstellar disk.[227] Giant planets and brown dwarfs are thought to form via disk fragmentation in rare cases in the outer regions of a disk (r > 50 AU).[228] Teasdale & Stamatellos modelled three formation scenarios in which the planet could have formed. In the first two scenarios the planet forms in a massive disk via gravitational instability. The first two scenarios produce planets that have accretion and separation comparable to the observed ones, but the resulting planets are more massive than Delorme 1 b. In a third scenario the planet forms via core accretion in a less massive disk much closer to the binary. In this third scenario the mass and accretion are similar to the observed ones, but the separation is smaller.[229]
One of the first five exoplanets to be confirmed by the Kepler spacecraft, within 34 days of Kepler's science operations,[236] and the first exoplanet to have a crude map of cloud coverage.[237][238][239]
First joint direct imaging and astrometric discovery of a planetary mass companion and the first planetary mass companion discovered using precision astrometry from the Gaia mission.[242] Likely a brown dwarf.
First exoplanet to be imaged by the James Webb Space Telescope.[249] The JWST direct imaging observations tightly constrained its bolometric luminosity, which provides a robust mass constraint of 7.1 ± 1.2 MJ. The atmospheric fitting of both temperature and radius are in disagreement with evolutionary models. Moreover, this planet is around 14 million years old which is however not associated with a debris disk, despite its young age,[250][251] causing it to not fit current models for planetary formation.[252]
First exoplanet to have its secondary eclipse and orbital phases observed from the ground-based observations[254] and first to have titanium oxide (TiO) detected in an exoplanet atmosphere.[255][256]
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[257][258] and the first to have an atmosphere detected, containing evaporating hydrogen, and oxygen and carbon. First extrasolar gas giant to have its superstorm measured.[259] Also first (indirect) detection of a magnetic field on an exoplanet.[260] This planet is on process of stripping its atmosphere due to extreme "hydrodynamicdrag" created by its evaporating hydrogen atmosphere.[261] Nicknamed "Osiris".
First directly imaged exoplanet discovered by a citizen scientist. This planet orbits around BD+60 1417 at the distance of 1662 AU, making this host star the only main sequence star with about 1 M☉ that is orbited by a planetary-mass object at a separation larger than 1000 AU.[271] Its status of exoplanet is unclear; according to the NASA Exoplanet Archive BD+60 1417b is an exoplanet[272] and it falls within their definition: An object with a minimum mass lower than 30 MJ and a not free-floating object with sufficient follow-up.[5] However, the official working definition by the International Astronomical Union allows only exoplanets with a maximum mass of 13 MJ and according to current knowledge BD+60 1417b could be more massive than this limit and might be a brown dwarf.[6]
Has the tightest orbit around a star in a binary star system. The formation and long-term stability of a planet on such a tight orbit and retrograde orbit relative to the binary's motion are challenging, but with the secondary being a white dwarf that lost most part of its mass during the evolution to a red giant and then to a white dwarf, both can be explained with either the instability of a former circumbinary planetary system that lead one of the planets to migrate inwards or by planetary formation by a second-generation protoplanetary disk that emerged from death of the white dwarf's progenitor.[283] Radius is an estimate.[282]
First exoplanet discovered around a single (as opposed to binary) white dwarf, and the coldest directly imaged exoplanet when discovered.[290] Possibly formed closer to Maru(WD 0806−661) when it was a main sequence star, this object migrated further away as it reached the end of its life (see stellar evolution), with a current separation of about 2500 AU. Alternatively, based on its large distance from the white dwarf, it likely formed like a star rather than in a protoplanetary disk, and it is generally described as a (sub-)brown dwarf in the scientific literature.[291] The planet was observed by the James Webb Space Telescope, which probed the atmosphere of the object, carried out with the Mid-Infrared Instrument medium resolution spectroscopy. The spectrum is dominated by absorption of water vapor, ammonia and methane. The molecules carbon monoxide and carbon dioxide are not detected, but the researchers determine the upper limits of their abundance. The atmosphere of Ahra is mostly consistent with theoretical models. Some results are however at odds with theoretical models, such as the non-detection of water clouds and the mixing ratio of ammonia. The retrieved mass of 0.45 – 1.75 MJ is smaller than expected (6.3 – 9.4 MJ), possibly hinting at a younger age or an incorrect retrieved mass.[288] Might be considered an exoplanet or a sub-brown dwarf, the dimmestsub-brown dwarf. The IAU considers objects below the ~13 MJ limiting mass for deuterium fusion that orbit stars (or stellar remnants) to be planets, regardless on how they formed.[292]
First exoplanet to have its thermal map constructed,[298] its overall color (deep blue) determined,[299][300] its transit viewed in the X-ray spectrum, one of first two exoplanets (other being "Osiris") to be observed spectroscopically[257][258] and first to have carbon dioxide confirmed as being present in its atmosphere. Such the rich cobalt blue[301][302] colour of HD 189733 Ab may be the result of Rayleigh scattering. The wind can blow up to 8,700 km/h (5,400 mph) from the day side to the night side.[303]
VHS 1256 b has its rotational axistilted at 90°±25° which is same as that of Uranus. However, unlike Uranus, its origin rules out planet-like scenarios such as collisions and spin-orbit resonances. This suggests that VHS 1256 b more likely formed via core/filament fragmentation.[306] This is also further proven by the presence of methane and water which if reacted each other, release hydrogen and carbon monoxide, both being common in the atmosphere of brown dwarfs, and silicate clouds within the atmosphere of VHS 1256 b with silicate clouds being the first direct detected in a planetary-mass object's atmosphere.[307]
First planetary body in an orbit discovered via direct imaging, and the first around a brown dwarf.[311][312] It could be considered a sub-brown dwarf due to its large mass in relation to its host: 2M1207 b is around six times more massive than Jupiter, but orbits a 26MJ brown dwarf, a ratio much larger than the 1:1000 of Jupiter and Sun for example. The IAU defined that exoplanets must have a mass ratio to the central object less than 0.04,[313][7] which would make 2M1207b a sub-brown dwarf. Nevertheless, 2M1207b has been considered an exoplanet by press media and websites,[314][315][316] exoplanet databases[317][318] and alternative definitions.[319] It will shrink to a size slightly smaller than Jupiter as it cools over the next few billion years, see Kelvin–Helmholtz mechanism.
Might be considered either a planet or a brown dwarf, depending on the definition chosen for these terms. If the brown dwarf/planet limit is defined by mass regime using the deuterium burning limit as the delimiter (i.e. 13 MJ), CoRoT-3 Ab is a brown dwarf.[329] If formation is the criterion, CoRoT-3 Ab may be a planet given that some models of planet formation predict that planets with masses up to 25–30 Jupiter masses can form via core accretion.[330] However, it is unclear which method of formation created CoRoT-3 Ab. The issue is clouded further by the orbital properties of CoRoT-3 Ab: brown dwarfs located close to their stars are rare, while the majority of the known massive close-in planets (e.g, XO-3b, HAT-P-2b and WASP-14b) are in highly eccentric orbits, in contrast to the circular orbit of CoRoT-3 Ab.[328]
First directly imaged planet containing methane absorption in the infrared H band[332] and ammonia in the atmosphere.[331] The mass of Gliese 504 b is hard to measure, as it depends on the host star's age, which is poorly known. The discoverers adopted an age value 0.16+0.35 −0.06Gyr and estimated mass as 4.0 +4.5 −1.0MJ[333] while other astronomers obtained an age value of 4.5 +2.0 −1.5 Gyr, which corresponds to 20 – 30 MJ. In this case, the object is a brown dwarf rather than a planet.[334] Intermediate ages were proposed in 2025, ranging from 400 million to one billion years, which would imply a mass between one and 17 MJ, still not sufficient to confirm the nature of GJ 504 b. Measuring the abundance of ammonia in the planet's atmosphere could constrain its mass, current measurements suggest a mass likely within the planetary-mass regime, while the mid-infrared brightness seems to place the object at a higher age and mass.[331] Ages between 360 million and 2.5 billion years were proposed in another 2025 study.[335]
Nearest and one of the two coldest extrasolar planets directly imaged.[337] Second closest Jovian exoplanet to the Solar System, after AEgir(ε Eridani b).
One of the two coldest extrasolar planets directly imaged and possibly the oldest at age 4.6 +3.8 −1.3Gyr, comparable to the age of the Solar System.[342]
Youngest transiting exoplanet discovered, with an age of just three Myr.[353] This planet will shed its outer layers during its evolution, becoming either a sub-Neptune, super-Earth or a sub-Saturn, with the radius shrinking to 1.5 – 4 R🜨 if the planet becomes a super-Neptune or 4 – 7 R🜨 if it becomes a sub-Saturn.[354]
Coldest exoplanet directly detected at a temperature of 186 +6 −7K[357] and first and only transiting true planet to be observed orbiting a white dwarf.[355] This gas giant orbits its host star closely at a distance of 0.02 AU. This indicates that the planet may have migrated inward after its host star evolved from a red giant to a white dwarf, otherwise it would have been engulfed by its star.[355] This migration may be related to the fact that WD 1856+534 belongs to a hierarchical triple-star system: the white dwarf and its planet are gravitationally bound to a distant companion, G 229–20AB, which itself is a binary system of two red dwarf stars.[355] Gravitational interactions with the companion stars may have triggered the planet's migration through the Lidov–Kozai mechanism[358][359][360] in a manner similar to some hot Jupiters. Another alternative hypothesis is that the planet instead has survived a common envelope phase.[361] In the latter scenario, other planets engulfed before may have contributed to the expulsion of the stellar envelope.[362]JWST observations seem to disfavour the formation via common envelope and instead favour high eccentricity migration.[363]
Coldest (sub-)brown dwarf discovered, having a temperature of about 285 K (12 °C; 53 °F). It is also the fourth-closest star and closest sub-brown dwarf (or possibly rogue planet) to the Sun at the distance of 7.43 ± 0.04 ly (2.278 ± 0.012 pc).[364] The mass and age of WISE 0855−0714 are neither known with certainty.[365] Also deuterium was detected, confirming it to be less massive than the deuterium burning limit.[366]
^The measured radius from 2003 to 2006 was 696,342 ± 65 kilometers, calculated by timing transits of Mercury across the surface.[12] while some in 2018 measured 695,660 ± 140 kilometers which is consistent with helioseismic estimates.[13] To avoid confusion, International Astronomical Union set the solar radius to exactly695700 km.[14]
^The best estimate mass is (1.988 475 ± 0.000 092) × 1030 kg.[11] Another estimate mass gave 1.988 420 × 1030 kg (based on the ratio of the mass of Earth to the Sun of 1⁄332946).[15] To simplify the solar mass, International Astronomical Union set it to exactly 1.988 416 × 1030 kg.[14]
^Using PMS evolutionary models and a potential higher age of 1 Myr, the luminosity would be lower, and the planet would be smaller. However, this would require for the object to be closer as well, which is unlikely. Another distance estimate to the Orion Nebula Cluster would result in a luminosity 1.14 times lower and also a smaller radius.
^Instead of a photo-evaporating disk it may be an evaporating gaseous globule (EGG). If so, it has a final mass of 2 - 28 MJ.[21]
^A calculated radius thus does not need to be the radius of the (dense) core.
^Proplyd 133-353 is proposed to have formed in a very low-mass dusty cloud or an evaporating gas globule as a second generation of star formation, which can explain both its young age and the presence of its disk.
^This radius estimate might have been affected by the planet's circumplanetary disk, as the spectrum not necessarily corresponds to a planet photosphere.
^ abcWhile inner binaries commonly use lower cases, planets also do use lower cases. For the case of 2M1510 inner binary, the binary is used as 2M1510AB.
A large radius of 2.23–2.4 RJ has been derived from transit photometry,[369] but this value is likely inaccurate due to the grazing transit of TOI-1408 b; it transits only part of the star's surface, thus hindering a precise measurement of planet-to-star size ratio.[370] The study revealed a clear transit timing variations (TTV) signal for TOI-1408 b, discovering super-Neptune TOI-1408 c which orbits closer to TOI-1408, and claims that their photodynamical modeling could constrain TOI-1408 b's radius more reliably, which needs to be confirmed.[369]
The planet is at the very edge of the deuterium burning limit. This object orbits around SR 12 AB at a separation of 980 AU but has a circumplanetary disk, detected in sub-mm with ALMA.[64] The nature of the disk is unclear: Assuming the disk has only 1 mm grains, the dust mass of the disk is 0.012 M🜨 (0.95 M☾). For a disk only made of 1 μm grains, it would have a dust mass of 0.054 M🜨 (4.4 M☾). The disk also contains gas, as is indicated by the accretion of hydrogen, with the gas mass being on the order of 0.03 MJ (about 9.5 M🜨).[64] Other sources of masses includes 14 +7 −8MJ,[371] 12 – 15 MJ[372] and 11 ± 3 MJ.[64]
Previously believed to be a likely brown dwarf, with mass estimates of 13–14 MJ[374] to 70 MJ,[375] its mass is now estimated to be 10±1 MJ, with an age of 13.3+1.1 −0.6 million years.[376]
First exoplanet to have its rotation rate measured[383][384] 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).[385] Beta Pictoris b is suspected to have an exomoon due to the former's predicted obliquity misalignment.[386]
Youngest directly imaged planet that has fully formed and orbits on Solar System scale. This planet formed in the vicinity of the snowline and later migrated to current position during its formation phase.[387] Part of binary system HD 135344.
Uncertainties in the system age translate into uncertainties in the object's mass. The discovery paper for Kappa Andromedae b argued that the primary's kinematics are consistent with membership in the Columba association, which would imply a system age of 20 to 50 Myr and a mass of about 12.8 MJ.[389] These results were later questioned by those who argued that the primary star's position on the Hertzsprung–Russell diagram favors a much older age of 220 ± 100 Myr, provided that the star, Kaffalmusalsala(Kappa Andromedae), is not a fast rotator viewed pole-on.[391][392] However, direct measurements of the star later showed that Kaffalmusalsala is in fact a rapid rotator viewed pole-on, which is the highest stellar rotational velocity of 283.8 km/s (176.3 mi/s),[393] and yield a best-estimated age of 47 +27 −40Myr favoring a mass between 13 and 30 MJ. A revised luminosity and detailed empirical comparisons with other substellar objects with known ages favor a mass of 13 +12 −2MJ.[388]
This planet orbits around HD 106906 at the separation of 738 AU, a distance much larger than what is possible for a planet formed within a protoplanetary disk.[396] Observations made by the Hubble Space Telescope strengthened the case for the planet having an unusual orbit that perturbed it from its host star's debris disk causing NASA and several news outlets to compare it to the hypotheticalPlanet Nine.[397][398][d] It was later found that its carbon-to-oxygen ratio is similar to the stellar association it is located in, suggesting that HD 106906 b could have been captured into the system as a planetary-massfree-floating object. This does not rule out formation in a star-like manner.[403]
^Hypothetical Planet Nine may be challenged by the discovery of 2017 OF201[399] which its orbit is anti-aligned to the calculated orbit of Planet Nine. The existence of 2017 OF201, which also means that there are likely many other similar objects that are just obscured from earth observation, challenges one of the leading arguments for Planet Nine, that its gravity causes trans-Neptunian objects to cluster into a distinct region.[400] It is suggested hypothetical Planet Nine would have ejected 2017 OF201 from its current orbit over times scales of less than 100 million years, though it could be in a temporary orbit.[399][401] Nevertheless, it is possible that Planet Nine's existence is still there as the simulations do not disprove Planet Nine.[402]
These planets are also larger than 1.6 times the size of the largest planet in the Solar System, Jupiter, but have yet to be confirmed or are disputed. Note: Some data may be unreliable or incorrect due to unit or conversion errors and some objects are candidate exoplanets such as TOI-7081 b and TOI-7018 b[405]
Key (Classification)
*
Probably brown dwarfs (≳ 13 MJ) (based on mass)
†
Probably sub-brown dwarfs (≲ 13 MJ) (based on mass and location)
Theoretical size limit of a newly-formed planet that needed 104 – 105 (10000 – 100000) years to migrate close to the host star, but has not yet interacted with it beforehand.
Discovered using a variation of disk kinematics.[408]Tidal disruption and extreme evaporation made the planet radius shrink from the beginning of the burst (14RJ) in 1937[407] to the present year by ~30 per cent and its mass is around half of its initial mass of 6MJ.[407][406]
First directly imaged planet that is actively forming within protoplanetary disk, specifically at the root of one of the disk's spiral arms[415][416] in which the structure of the disk is the first one that exhibited a high degree of clarity and was observed using several space telescopes and ground-based telescopes, through an international research program of young stars and of stars with planets.[417] Part of binary system HD 135344.
While TOI-7081 b cannot be classified as brown dwarf or exoplanet without a mass estimate, the study found TOI-7081 b and TOI-7018 b are puffy but cool Jupiters which may be caused by delayed contraction due to inefficient internal heat transport, where composition gradients or layered convection slow cooling and prolong inflation. Future radial velocity observations can constrain eccentricities and test tidal heating as a possible factor.[405]
CVSO 30 c was discovered by direct imaging, with a calculated mass equal to 4.7 MJ.[422] However, the colors of the object suggest that it may actually be a background star, such as a K-type giant or a M-type subdwarf.[423] If confirmed in the future, it would be the furthest planet to be directly imaged at a dstance of about 1200 ly. Moreover, the phase of "dips" caused by suspected planet CVSO 30 b had drifted nearly 180 degrees from the expected value, thus ruling out the existence of the planet. CVSO 30 is also suspected to be a stellar binary, with the previously reported planetary orbital period equal to the rotation period of the companion star.[424]
While TOI-7018 b cannot be classified as brown dwarf or exoplanet without a mass estimate, the study found TOI-7081 b and TOI-7018 b are puffy but cool Jupiters which may be caused by delayed contraction due to inefficient internal heat transport, where composition gradients or layered convection slow cooling and prolong inflation. Future radial velocity observations can constrain eccentricities and test tidal heating as a possible factor.[405]
Exoplanets with known mass of ≥1MJ but unknown radius
The common proper motion with respect to the host star is not yet proven, however, the probability that CHXR 73 and b are unrelated members of Chamaeleon I is ~0.1%.[425] A radius is not yet published, but could be determined. Other members of the same star-forming region in this list, Cha 110913, CT Cha b, OTS 44, all have radii > 2 RJ.
Either a former hot Jupiter or a hot Neptune. Third planet observed to be engulfed by its host and first one in an older age star.[428] This planet accreted mass from the star and launched some of this mass away in jets. As the planet orbited closer to the star, the star removed the accreted mass and formed a disk around the star and launched jets.[428]
First exoplanet discovered with a ring system;[430] its circumplanetary disk or ring system has been frequently compared to that of Saturn's, which has led popular media outlets to dub it as a "Super Saturn"[431][430] First detected by automated telescopes in 2007 when its disk eclipsed the star 1SWASP J1407–39(J1407) and later discovered in 2010 and announced in 2012.[432] Its status is disputed as while the properties of the ALMA object appear to match those of J1407b, it has only been observed once, making it uncertain whether its motion aligns with the expected direction and speed.[429] Recent studies found J1407b likely does not orbit V1400 Centauri and is instead a free-floating object[433][429] with circumplanetary disk,[432][434] or a large ring system composed of mainly dust.[429]
In 2019, a third object was detected 0.12 arcseconds from the star. Its spectrum is very blue, possibly due to star light reflected in dust which could be a feature of the inner disk. The possibility does still exist that this object is a planetary mass object enshrouded by a dust envelope. For this second scenario the mass of the planet would be on the order of a few tens M🜨.[436] In 2025 a team[b] detected Keplerian motion of the candidate. The orbit could be in resonance with the PDS 70 b and PDS 70 c. The spectrum in the infrared is mostly consistent with the star PDS 70, but beyond 2.3 μm an infrared excess was detected. This excess could be produced by the thermal emission of the protoplanet, by circumplanetary dust, variability or contamination. The source may not be a point-like source. The source is therefore interpreted as an outer spiral wake from protoplanet PDS 70 d with a dusty envelope. A feature of the inner disk is an alternative explanation of candidate PDS 70 d.[435] PDS 70 is the second multi-planet system to be directly imaged (after HR 8799).
All four confirmed HR 8799 planets orbit inside and outside of dusty disks like the SolarKuiper belt and asteroid belt, which leaves room for HR 8799 f to be discovered inside the inner disk.[438] It is difficult to find planet(s) inside inner disks as these planets at smaller semi-major axes have much shorter orbital periods according to Kepler's third law. At a separation of ~5 au, a planet in this system would move fast enough that observations taken more than a few months apart would start to blur the planet. Nonetheless, the evidence for HR 8799 f is found by a deep targeted search in the HR 8799 system and recovery of the known HR 8799 planets.[437] HR 8799 is the first multi-planet system to be directly imaged.
V391 Pegasi b (V391 Peg b, HS 2201+2610 b) (unconfirmed)
First planet candidate to claim to be detected using variable star timing and first candidate planet orbiting around a subdwarf B star. If confirmed, its survival would indicate that planets at Earth-like separations can survive their star's red-giant phase, though this is a much larger planet than Earth (about the same size as Jupiter and Saturn).[439] However, subsequent research found evidence both for and against the exoplanet's existence. Although the planet's existence was not disproven, the case for its existence is now certainly weaker, and the authors stated that it "requires confirmation with an independent method".[440]
In 1986, the Sirius stellar system emitted a higher than expected level of infrared radiation, as measured by the IRAS space-based observatory. This might be an indication of dust in the system, which is considered somewhat unusual for a binary star.[443][444] The Chandra X-ray Observatory image shows Sirius B outshining Sirius A as an X-ray source,[445] indicating that Sirius B may have its own exoplanet(s).
Total of 42 JuMBO systems among 540 free-floating Jupiter-mass objects of which contains 40 binary systems and 2 triplet systems, discovered in Orion Cluster as of 2025. Their wide separations also differ markedly from typical brown dwarf binaries, which have much closer separations around 4 astronomical units.[447] These JuBO binary pairs have separations ranging from 28 to 384 astronomical units.[446] Current formation theories suggest JuMBOs may form when radiation from massive stars erodes fragmenting pre-stellar cores through a process called photoerosion. In this scenario, Lyman continuum radiation from massive stars drives an ionization shock front into a prestellar core that was already beginning to fragment into a binary system. This process simultaneously compresses the inner layers while evaporating the outer layers, resulting in a very low-mass binary system. The process appears most effective within HII regions created by massive stars, though many observed JuMBOs lie outside these regions in the Orion Nebula Cluster. This distribution suggests the objects may have migrated from their formation sites through dynamical interactions over time.[447] Another study argued that JuMBOs formed in situ, like stars. The JuMBOs most likely form directly alongside stars in the cluster, rather than through ejection from planetary systems or capture events. The other proposed mechanisms - ejection of planet pairs from stars, ejection of planet-moon systems, or capture of free-floating planets - failed to produce enough binaries or required unrealistic initial conditions.[448] The most successful model shows that JuMBOs form best about 0.2 million years after the stars, when the cluster environment has partially stabilized. This timing allows enough JuMBOs to survive to match the observed 8% binary fraction. The model also correctly predicts the observed orbital separations of 25-380 astronomical units and mass distributions. The lack of JuMBOs in older star clusters like Upper Scorpius is explained by their gradual destruction through gravitational interactions over time, with simulations predicting that only about 2% of the original pairs survive after 10 million years.[448] An astronomer found that most JuMBOs did not appear in his sample of substellar objects as the color was consistent with reddened background sources or low signal-to-noise sources with only JuMBO 29 being a good candidate for a binary planetary-mass system.[364]
A very puffy Hot Jupiter which is among planets with lowest densities of ~0.061 g/cm3. Largest known planet with a precisely measured radius, as of 2025.[87]
The commonly favored model for gas giant planet formation – core accretion – has significant difficulty forming massive gas giant planets at AB Aur b's very large separation from its host AB Aur. Instead, AB Aur b may be forming by disk (gravitational) instability,[449] where as a massive disk around a star cools, gravity causes the disk to rapidly break up into one or more planet-mass fragments.[450] A more recent study revised the apparent magnitude, making AB Aur b more likely to be brown dwarf.[61]
A very puffy Hot Jupiter. is consistent, but is either given as about 1.93 R☉ or about 1.42 R☉ in newer references.[451] Large size needs confirmation due to size discrepancy.
First confirmed exoplanet candidate to be directly imaged. It is believed to be several times more massive than Jupiter. Because the theoretical models which are used to predict planetary masses for objects in young star systems like GQ Lupi b are still tentative, the mass cannot be precisely specified, giving the masses of 1 – 39 MJ.[30]
The commonly favored model for gas giant planet formation – core accretion – has significant difficulty forming massive gas giant planets at AB Aur b's very large separation from its host AB Aur. Instead, AB Aur b may be forming by disk (gravitational) instability,[449] where as a massive disk around a star cools, gravity causes the disk to rapidly break up into one or more planet-mass fragments.[450]
The planet is at the very edge of the deuterium burning limit. Mass being below it needs confirmation. Other sources of masses includes 14 +7 −8MJ,[371] 12 – 15 MJ.[372]
It was thought to be the first discovered exoplanet until 2019, when it was confirmed to be a low-mass star with the mass of 107 +20 −27MJ[458] (and later reviewed up to 147.0 +39.3 −42.0MJ in 2020[459] and 306.93 MJ (0.293 M☉) in 2022).[457]
Discovered by Kepler in first four months of Kepler data.[140] A more recent analysis argues that a third-light correction factor of 1.818 is needed, to correct for the light blending of Kepler-13 B, resulting in higher radii results.[138]
First convincing exoplanet discovered orbiting a main-sequence star. A prototype hot Jupiter. In 2015, a study allegedly detected visible light spectrum from Dimidium using the High Accuracy Radial Velocity Planet Searcher (HARPS) instrument.[281] This suggested a high albedo for the planet, hence a large radius up to 1.9 ± 0.3 RJ, which could suggest 51 Pegasi b would be an inflated hot Jupiter.[280] However, recent studies found no evidence of reflected light, ruling out the previous radii and albedo estimates from previous studies with Dimidium being likely a low-albedo planet with a radius around 1.2±0.1 RJ.[279][463]
Large size needs confirmation. Other estimates include 1.9 – 2.4 RJ, 1.3 – 4.7 RJ.[90] Other recent sources of masses include 3.2 – 27 MJ,[92] 13 ± 5 MJ.[32]
The radius is dependent on whether the orbit is circular or eccentric. Later shown to be most likely close to the lower end of the originally possible radius range.
First planet discovered to have a retrograde orbit[196] and first to have quartz (crystalline silica, SiO2) in the clouds of an exoplanet.[197] Puffiest and possibly largest exoplanet at the time of discovery.[198]Extremely low density of 0.08 g/cm3.[196]
Largest confirmed exoplanet ever found and least dense planet of 0.17 g/cm3, about that of balsa wood, less than Saturn's 0.7 g/cm3, at the time of discovery.[161][95]
Mass being below the deuterium burning limit needs confirmation. Temperature originally given as 2700 – 2800 K.[473] Other sources give the radii: 2.49 RJ,[44][e] 2.68 RJ,[474] and 2.6 ± 0.6 RJ[32] and masses: 11 ± 3 MJ,[35] 14.2 +2.4 −3.5MJ,[68] 17 ± 6 MJ[69] and 12 ± 4 MJ[32]
First known transiting exoplanet, first precisely measured planet available, first to have its orbital speed measured, determining its mass directly,[476] one of first two exoplanets (other being HD 189733 Ab) to be observed spectroscopically[257][258] and first to have an atmosphere, containing evaporating hydrogen, and first to have contained oxygen and carbon. This planet is on process of stripping its atmosphere due to extreme "hydrodynamicdrag" created by its evaporating hydrogen atmosphere.[261] Nicknamed "Osiris".
First known transiting exoplanet, first precisely measured radius available, first to have its orbital speed measured, determining its mass directly,[476] and first to have an atmosphere, containing evaporating hydrogen, and first to have contained oxygen and carbon. First extrasolar gas giant to have its superstorm measured. Nicknamed "Osiris".
About 20 – 25 planets including Saffar were found within this time span via the radial velocity method, none of them had radius measurements shortly after their discoveries. As expected, Dimidium is larger than Poltergeist, whether one of the additional planets found till 1999 is larger than Dimidium is not clear to this day. Saffar has a phase curve measurement (see 2015), but confirmation of being larger than Dimidium is still needed. 16 Cygni Bb is the first eccentric Jupiter and first in a double star system to be discovered while Taphao Thong(47 UMa b) is the first long-period planet around a main sequence star to be discovered. Gliese 876 b is also the first planet to be discovered orbiting a red dwarf.
Likely larger than Poltergeist, but not confirmed as planet until 2003. First circumbinary planet, first planet to be found in a globular cluster and the oldest planet to be discovered (until 2020) at the age of 11.2–12.7 billion years old,[481] hence the nickname, "Methuselah".[480][482]
Discovered in 1989 by Latham to have a minimum mass of 11.069 ± 0.063 MJ (at 90°) and a probable mass of approximately 63.2 MJ (at 10°),[490] making the former planet the first to be spotted,[491] and confirmed in 1991, it was thought to be the first discovered exoplanet (or second if it included Tadmor during its evidence) until 2019 when it was confirmed to be a low-mass star with the mass of 107 +20 −27MJ[458] (and later reviewed up to 147.0 +39.3 −42.0MJ in 2020[459] and 306.93 MJ (0.293 M☉) in 2022),[457] making one of the Lich planets the first exoplanet confirmed ever, or Dimidium, if the planet should have secured been formed in a first round of planet formation with the star.
First evidence for exoplanet to receive later confirmation. First reported in 1988,[493] making it arguably the first true exoplanet discovered, and independently in 1989,[494] however, retracted in 1992[495] due to the possibility that the stellar activity of the star mimics a planet not allowing a solid discovery claim and then finally confirmed in 2003.[496]
Oldest, largest and most massive planet in the Solar System[346] Observations date back to 7th or 8th century BC. Using an early telescope the Galilean moons were discovered in 1610, the planet hosts 95 known moons. Photograph took in 1879, making Jupiter the first planet to have recognisable photo of a planet. Reported for reference.
^This radius estimate might have been affected by the planet's circumplanetary disk, as the spectrum not necessarily corresponds to a planet photosphere.
^Calculated using Rp/R⋆ multiplied by R⋆. The value is later multiplied by (142984 km ÷ 1391400 km) to convert from R☉ to RJ.
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