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. Then there is the fact that these objects might be brown dwarfs, sub-brown dwarfs, or not exist at all. Because of this, this list only cites the most certain measurements to date and is prone to change.
The sizes are listed in units of Jupiter radii (RJ, 71 492 km). This list is designed to include all planets that are larger than 1.7 times the size of the largest planet in the Solar System, Jupiter. Some well-known planets that are smaller than 1.7RJ (19.055 R🜨 or 121536.4km) have been included for the sake of comparison.
GQ Lupi b has a mass of 1 – 46 MJ; in the higher half of this range, it may be classified as a young brown dwarf. GQ Lup Ab / GQ Lup b / GQ Lup B should not be confused with the star GQ Lup C. Most recently 20±10 MJ.[14]
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[16] is confused with the actual radius. There is also a chance of this planet being much smaller.
Very likely a brown dwarf[19] or sub-brown dwarf.[20] 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.[17]
The closest halo star / redsubdwarf to the Solar System at the distance of 12.82 ly (3.93 pc). Also having the second-highest proper motion of any stars. Having an age of 11.5 +0.5 −1.5Gyr. Reported for reference.
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. The currently preferred radius estimate is done by SED modelling including substellar object and disk model.[17]
This planet is so close to its parent star that its tidal forces are distorting it into an egg-like 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 starlight that reaches its surface. WASP-12b is suspected to have one exomoon due to a curve of change of shine of the planet observed regular variation of light.[67]
First exoplanet found to contain water in an extrasolar planetary stratosphere. Tylos is suspected to have exo-Io candidate due to the sodium being detected via absorption spectroscopy around the planet.[78]
The tidally-locked planet where winds move 18000 km/h, and where molten iron rains from the sky due to daytime temperatures exceeding 2400 °C (4350 °F).[84][85] WASP-76b is suspected to have an exo-Io candidate due to the sodium being detected via absorption spectroscopy around WASP-76b.[86]
Radius estimated using the phase curve of reflected light. The planet orbits very close to its host star of 0.0595 AU, completing an orbit in 4.617 days.[98]
The large radius of 2.75 RJ is only valid for 1 Myr. Several publications give a higher age, e.g. 1-5 Myr,[117]4±1 Myr,[118] 6.0+2.5 −1.0 Myr.[119] Its optical/UV detection is disputed,[120] its accretion rate is disputed[121], while its existence as a planet after original detection in the IR needs confirmation.[117]
It is the first extrasolar planet to have a crude map of cloud coverage.[124][125][126] One of the first five exoplanets to be confirmed by NASA's Kepler spacecraft, within 34 days of Kepler's science operations.[127]
Previously believed to be a likely brown dwarf, with mass estimates of 13−14 MJ[129] to 70 MJ,[130] its mass is now estimated to be 10±1 MJ, with an age of 13+1.1 −0.6 million years.[131]
The nearest star to the Sun at the distance of 4.24 ly (1.30 pc), orbiting around the Alpha CentauriAB System, the nearest star system to the Sun, at a separation of 12950AU (0.2048 ly),[133] equivalent to about 430 times the radius of Neptune's orbit, orbiting around 550000 years. Has a confirmed planet, Proxima Centauri b[134] (may be a habitable planet), a candidate (unconfirmed) planet, Proxima Centauri d and a disputed planet Proxima Centauri c; all three (or Proxima Centauri b if considering only confirmed planets) being the closest exoplanet to the Solar System. Reported for reference.
First exoplanet to have its thermal map constructed,[143] its overall color (deep blue) determined,[144][145] its transit viewed in the X-ray spectrum, and to have carbon dioxide confirmed as being present in its atmosphere. Such the rich cobalt blue[146][147] colour of HD 189733 b 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.[148]
First directly imaged planetary body to have its spectrum taken and first planet discovered orbiting a brown dwarf. Its mass is well below the limit for deuterium fusion in brown dwarfs of 13 MJ. This planet will shrink to a size slightly smaller than Jupiter as it cools over the next few billion years.
Initially possibly formed closer to Maru(WD 0806−661), the planet or brown dwarf migrated further away as Maru reached the end of its life with current separation of about 2500 AU. 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.[153] Maru's age of 1.5–2.7 Gyr[154] is higher than several objects' on top of this list.
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-3b is a brown dwarf.[157] If formation is the criterion, CoRoT-3b 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.[158] However, it is unclear which method of formation created CoRoT-3b.
Located in the Kepler-90 system with eight known exoplanets, whose architecture is similar to that of the Solar System, with rocky planets being closer to Kepler-90 and gas giants being more distant. This largest, most massive and outermost planet orbits every ~331.6 days at a separation of 1.01 AU and could theoretically have a habitable Earth-like exomoon.
Mass being below the deuterium burning limit needs confirmation. DH Tau b has itself a companion candidate, an exomoon candidate of about 1 MJ, referred to as DH Tau Bb. Its estimated orbital period is about 320 years.[28] This object has a circumplanetary disk, the first one ever confirmed, detected with polarimetry at the VLT.[29]
The planet is at the very edge of the deuterium burning limit. Mass being below it needs confirmation. This object has a circumplanetary disk, detected in sub-mm with ALMA.[33]
About 20 – 25 planets were found within this time span via the radial velocity method, none of them having radius measurements, especially shortly after their discovery. 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.
Likely larger than Poltergeist, but was not confirmed until 2003. First circumbinary planet and the oldest planet to be discovered (until 2020) at the age of 11.2–12.7 billion years old, hence the nickname, "Methuselah".
Discovered in 1989 by Latham, et al. to have a minimum mass of 11.069 ± 0.063 MJ (at 90°) and a probable mass of approximately 63.2 MJ (at 10°).[169], and confirmed in 1991, 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 147.0 +39.3 −42.0MJ,[170] making the planet above the first confirmed planet discovered ever.
First evidence for exoplanet to receive later confirmation. First reported in 1988[172] (making it arguably the first true exoplanet discovered) and independently in 1989[173], however, retracted in 1992[174] 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.[175]
Oldest, largest and most massive planet in the Solar System[164] 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. Reported for reference.
^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.[7]
^Instead of a photo-evaporating disk it may be an evaporating gaseous globule (EGG). If so, it has a mass of 2 - 28 MJ.[7]
^A calculated radius thus does not need to be the radius of the (dense) core.
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