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Transiting Planet Types

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Exoplanetary Scratchpad

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List of transiting planets based on their characteristics.


Mass/Radius/Density/Temperature Classes

Transiting Brown Dwarves

  • CoRoT-15 System (Jun 10) - Transiting Brown Dwarf discovered by CoRoT along with 7 transiting exoplanets around different stars. It is 60 times as massive as Jupiter.

Hot Super Jupiters

Planets that have several Jupiter masses, but are about the same radius as Jupiter, and thus have high densities.

  • CoRoT-3 System (Oct 08) - A star with possibly the most massive planet known at 20 Jupiters and most dense at about Jupiter's radius. The planet is technically classified as a brown dwarf, but they haven't ruled out it being a planet. It could be the first of a class of massive planets orbiting stars more massive than the Sun. It's the first object found with a period of less than ten days greater than 12J and less than 70J.
  • WASP-10 System (Oct 08) - System that contains a super Jupiter around an orange star. At first believed to be inflated, but later found to be smaller. Has a density similar to the moon. Has a candidate planet detected by the Transit Timing Variation method.
  • CoRoT-14 System (Jun 10) - One of seven transiting exoplanet systems discovered by CoRoT announced in Jun 2010. Has a similar size to Jupiter, but is 7.5 times as massive and 6 times as dense. This is only the second such very hot planet discovered.

Very Hot Super Jupiters

  • SWEEPS 11 System - Super Very Hot Jovian detected 8500 parsecs away in the galactic bulge. One of only 2 transit candidates bright enough to be confirmed with radial velocity technique.
  • WASP-18 System - A hot F6 star that has Super Jupiter that is only 2.5 stellar radii from its host star. It may perish soon once it reaches its star's roche limit, but astronomers are puzzled why it hasn't already. Because it orbits much faster than its star rotates, tidal effects should be causing it to fall inwards. Further observations should reveal its rate of decay. Has the shortest period of any Hot Jupiter at the time of its discovery (22hours).

Inflated Hot Super Jupiters

  • OGLE2-TR L9 System - First planet discovered around a rapidly rotating hot star and the hottest star with planets. Was detected by students while testing a method for investigating light fluctuations in the OGLE database. An inflated hot super Jupiter. Nicknamed "ReMeFra-1" for its discoverers.

Inflated Very Hot Super Jupiters

  • WASP-3 System - One of three systemss discovered by Super WASP containing a transiting planet so close to its star that it is evaporating. Like the other two, WASP-4 and 5, it is incapable of radiating away heat from its star and instead swells up to significantly larger than Jupiter. This is a planet 81% more massive than Jupiter with 13% larger radius going around in just less day 2 days. Its transit time varies by up to 3 minutes, which indicates that a further planet may be in this system. This would be a further Neptunian planet and would be the first exoplanet detected by measuring eclipse timing deviations of an earlier discovered planet (Transit Timing Variation method). Further observations are needed to confirm the planet, but the best fit is that it is in 2:1 resonance with the larger planet.
  • CoRoT-2 System - A younger version of the Sun with a transiting Inflated Hot Super Jupiter 880ly away. This planet has been used to identify star spots on its surface. It was found to be blasted with x-rays 100,000 times more powerful than the Earth is by the Sun, which is blasting 5 million tons of matter of the planet into space every second. The planet is unusually inflated for its distance. The system is believed to be 100 and 300 Million years old, young, but fully formed. The planet is 3 times as massive as Jupiter and orbits the planet about 10 Earth-Moon distances away. Its proximity may be speeding up its star, keeping its magnetic field active, and maintaining its volatility.
  • WASP-33 System - Aka HD 15082, this is the only known Delta Scuti variable star (kA5 hA8 mF4) known to host a planet. The star is much hotter than the Sun and 50% more massive. The planet is a retrograde inflated hot super Jupiter and is by far hottest measured exoplanet (3150C), 900C hotter than WASP-12b, and hotter than some red dwarf stars. It is one of the 6 out of 27 planets analyzed by the WASP team found to orbit backwards around its star in 2010. The planet may be responsible for the star's pulsations.

Eccentric Super Jupiters

  • HAT-P-2 System (May 07) - Hat-P-2b (aka HD 147506b) is the most massive measured exoplanet discovered that is clearly not a Brown Dwarf and the first transiting Hot Super Planet discovered. It is the first known transiting planet with a significantly eccentric orbit and experiences significant seasons. It briefly held the record of furthest out transiting planet.
  • HD 17156 System (Oct 07) - Star system containing a planet discovered by dopplar spectrometry method and later found by amateurs to transit. At the time, it smashed the records for the furthest transiting planet (period of 21 d) and most eccentric orbit. A second, unconfirmed planet has also been proposed for this system.
  • XO-3 System - Planet is the first transiting object with mass on the borderline between being a planet and a Brown Dwarf. The largest known planet in a torch orbit at time of its discovery. Found to be inclined to its star 37degrees, while every other torch planet aligns with their star's equator. Heat received from star varies three-fold due to its eccentricity. Larger than models predict. Has a temperature inversion in its stratosphere.

Inflated Very Hot Jupiters

  • HD 189733 System (Dec 2005, retracted 2006) - Planet b (the first nearby Very Hot Jupiter, originally thought to be inflated) is the nearest planet discovered using the transit technique (62.9 ly). This is the first exoplanet to have its temperature mapped and was nicknamed Bull's Eye for its hot spot that is significantly offset from the starward pole. It is also the first exoplanet for which scattered light in the upper atmosphere has been detected and the second exoplanet with water detected and first with Methane and then Carbon Dioxide detected. It later was the first exoplanet whose gasses were detected from Earth-based telescopes. It was also found to spin up its star and magnetically interact with it, causing stellar storms. Hubble found that its atmosphere was a uniform blue haze.
  • CoRoT-1 System (May 07) - Contains the first transiting planet found by the French COROT mission. It was discovered during a test run and promises to be the first of many detected. One of the largest exoplanets found (and least dense), it has about Jupiter's mass, but 50% more diameter. The planet later became the first exoplanet whose phases were detected from Earth.
  • WASP-3 System (Oct 07) - One of three systemss discovered by Super WASP containing a transiting planet so close to its star that it is evaporating. Like the other two, WASP-4 and 5, it is incapable of radiating away heat from its star and instead swells up to significantly larger than Jupiter. This is a planet 81% more massive than Jupiter with 13% larger radius going around in just less day 2 days. Its transit time varies by up to 3 minutes, which indicates that a further planet may be in this system. This would be a further Neptunian planet and would be the first exoplanet detected by measuring eclipse timing deviations of an earlier discovered planet (Transit Timing Variation method). Further observations are needed to confirm the planet, but the best fit is that it is in 2:1 resonance with the larger planet.
  • WASP-4 System (Oct 07) - One of three systemss discovered by Super WASP containing a transiting planet so close to its star that it is evaporating.
  • WASP-12 System (Oct 08) - The shortest period transiting Hot Jupiter known and the first carbon-rich planet ever found (more Carbon than Oxygen). One of the two largest known planets at 1.79 Jupiter radii. Hottest known exoplanet at time of its discovery. Planet is being ripped apart by star. It is stretched in the shape of a rugby ball and leaves a ring around its star. Huge cloud of material detected around the planet containing elements never before detected on an exoplanet. It has much more methane than water vapor. It may produce shock waves as it plows through its star's stellar wind (the first evidence of shocks around an exoplanet, like Earth and Saturn's bowshocks), possibly produced by a strong planetary magnetic field. This could protect its atmosphere from being stripped away. It could have a diamond core and other terrestrial planets in system would have black spots on them and also be carbon based.

Very Hot Jupiters

  • OGLE-TR-56 System (2002) - Contains first planet discovered by transit and later confirmed by Dopplar Spectroscopy (rather than the other way around). The first OGLE planet confirmed with the Dopplar method. It is 6000 ly away, 10 times as far as any previous known planet, in a different arm of the galaxy. Also the first Very Hot Jupiter discovered. It may meet its doom in less than a million years. Planet has one of the first two ground-detected atmospheres. Has an atmosphere hotter than any other measured so far. Unlike other hot Jupiters observed, it is way too hot for clouds of silicon or iron to form which would keep it dark.
  • OGLE-TR-113 System (2003) - A binary orange dwarf star 1800 ly away in a crowded star field in Carina. It contains the second discovered Very Hot Jupiter (34 hours, 0.023 au, 1.3 MJ) and one of the first discovered transiting planets. At one time it was the only known transiting Hot Jupiter with a surface gravity greater than Jupiter's. Between 2002 and 2009, its transit times were found to shorten by 60 ms per earth year. This indicates that it is slowly spiraling towards its sun, the first exoplanet found to be doing this, and may get ripped apart by its star in 1.4 million years, when its period is reduced to 10.8 hours. An alternate explanation may be that an unseen planetary companion is causing the timing differences.
  • OGLE-TR-132 System (2003) - Has the third discovered Very Hot Jupiter, validating the believability of the first one found.
  • HD 189733 System (Dec 05) - Planet b (the first nearby Very Hot Jupiter, originally thought to be inflated) is the nearest planet discovered using the transit technique (62.9 ly). This is the first exoplanet to have its temperature mapped and was nicknamed Bull's Eye for its hot spot that is significantly offset from the starward pole. It is also the first exoplanet for which scattered light in the upper atmosphere has been detected and the second exoplanet with water detected and first with Methane and then Carbon Dioxide detected. It later was the first exoplanet whose gasses were detected from Earth-based telescopes. It was also found to spin up its star and magnetically interact with it, causing stellar storms. Hubble found that its atmosphere was a uniform blue haze.
  • TrES-3 System (May 07) - Has planet TrES-3, the most massive transiting Very Hot Jupiter planet. Planet has one of the first two ground-detected atmospheres. A large ground-based telescope method of observation was pioneered on this planet.
  • WASP-3 System (Oct 07) - One of three systemss discovered by Super WASP containing a transiting planet so close to its star that it is evaporating. Like the other two, WASP-4 and 5, it is incapable of radiating away heat from its star and instead swells up to significantly larger than Jupiter. This is a planet 81% more massive than Jupiter with 13% larger radius going around in just less day 2 days. Its transit time varies by up to 3 minutes, which indicates that a further planet may be in this system. This would be a further Neptunian planet and would be the first exoplanet detected by measuring eclipse timing deviations of an earlier discovered planet (Transit Timing Variation method). Further observations are needed to confirm the planet, but the best fit is that it is in 2:1 resonance with the larger planet.

Inflated Hot Jupiters

Hot Jupiters with large radius that cannot be explained by energy recieved.

  • HD 209458 System (1999)- Has first discovered transiting planet which was nicknamed Osiris due to the comet-like tail detected and the first exoplanet around a normal star to have its mass directly measured. The planet may be losing its outer atmosphere, or magnetism may prevent the ions from escaping. They detected water in its atmosphere (they had failed earlier), the first time this has been done for any exoplanet. 2nd Exoplanet with detected organic compounds; like HD 189733b, it has water and carbon dioxide, but it has a lot more Methane. Tracking carbon molecules with dopplar spectrometry caused it to be the first exoplanet detected to have winds, which are raging at 5,000 to 10,000 km/h. This is believed to cause hotspots to appear at terminators rather than at the star-ward facing point.
  • OGLE-TR-10 System (Apr 2005, retracted 2005, reinstated 2006 but uncertainties in radius) - Contains a bloated Hot Jupiter expected to be losing its atmosphere. Noted for its similarity to the first transiting exoplanet. Thought to not be so bloated, but then confirmed to really be bloated. Found to have the lowest measured surface gravity of any of the transiting exoplanets, considerably less than Earth. 5th confirmed OGLE planet.
  • HAT-P-1 System (Sep 06, retracted Jul 07) - A stellar binary believed to contain the planet with the biggest known diameter and the least dense. This would have been only the second planet with such a low density. Later measurements showed it wasn't that inflated, and has the expected radius for a highly irradiated core-less Hot Jupiter.
  • WASP-1 System (Sep 06) - Has the first planet detected by the WASP program, which is the third "inflated" Hot Jupiter detected, which suggested these planets were fairly common. It was nicknamed "Garafía-1" after the municipality that hosts the Roque de Los Muchachos Observatory. Was the largest known exoplanet for about a year. Shows signs of atmospheric blow-off.
  • TrES-4 System (Aug 07) - Contains the transiting planet TrES-4, the largest (volume) exo-planet at the time of its discovery, orbiting a sub-giant star.
  • HAT-P-4 System (Oct 07) - A low-density inflated Hot Jupiter around a metal-rich star. Its presumed high level of heavy elements presents a challenge for explaining Inflated Hot Jupiters. Perhaps it has both a dense core and an inflated radius?
  • HAT-P-6 System (Oct 07) - An inflated Hot Jupiter (1.33 JR) around a bright F-type star. It's Jupiter-like mass (1.06 MJ) is higher than the other 5 low-density inflated Hot Jupiters known at the time of its discovery in 2007. Its star is one of the most metal-poor ones hosting a transiting planet. A small dense core is expected.
  • OGLE-TR-211 System (Nov 07) - Contains the 7th discovered OGLE transiting planet. Has 20% greater radius than Jupiter and is thus classified as an inflated hot jupiter.
  • XO-4 System (May 08) - System that contains an inflated Hot Jupiter.
  • WASP-10 System (Oct 08, retracted 2009) - System that contains a super Jupiter around an orange star. At first believed to be inflated, but later found to be smaller. Has a density similar to the moon. Has a candidate planet detected by the Transit Timing Variation method.
  • WASP-17 System - An F6 type star which has the first exoplanet discovered in a retrograde orbit. Also the largest known exoplanet at 1.74 RJ and 0.5 JM. Discovered by transit. It may be "flipping" its star's axis. Orbit hints at a near planetary collision in its early years. One of the 6 out of 27 planets analyzed by the WASP team found to orbit backwards around its star in 2010. It was found to be abundant in CO, depleted in water and methane. It lacks a prominent stratosphere and has efficient day-night energy circulation.
  • HAT-P-7 System (Aug 09) - Contains a transiting hot Jupiter. This planet was used as a test for the Kepler mission, which was able to detect the planet's occulation, as well as evidence of phases. It was found to be orbiting backwards only a day after the first retrograde exoplanet WASP-17b was announced. Very little of its heat is transported to its night side. There is some evidence for a planet further out that may be responsible for its orbit. Observed by Kepler and also dubbed Kepler 2b.
  • HAT-P-9 System (Jan 09) - System that contains an inflated Hot Jupiter around a moderately faint F star.
  • CoRoT-12 System (Jun 10) - One of seven transiting exoplanet systems discovered by CoRoT announced in Jun 2010. Orbits close to its star. A bloated Hot Jupiter, its diameter is 150% that of Jupiter's.

Normal Hot Jupiters

Hot Jupiters whose radius conforms radiative theories.

  • TrES-1 System (Aug 2004) - Contains the first transiting exoplanet discovered with the TrES amateur equipment and second transiting exoplanet close enough to have its atmosphere studied. It is the first Hot Jupiter that had the expected radius. Was the one of the first two exoplanets to have its light separated from its host star.
  • OGLE-TR-111 System (Sep 2004) - Has the first OGLE-detected transiting "normal" Hot Jupiter (the others had unusually short periods). Data suggests the presense of a second planet, which, if confirmed, would make this the first system with more than one transiting planet.
  • TrES-2 System (Sep 06) - Contains TrES-2, which was the most massive nearby transiting planet until the discovery of Hat-P-2 b. It has a large radius for a planet not considered inflated. A large ground-based telescope method of observation was pioneered on this planet. Since its in Keplar's field of view, it was observed by it as a test subject and dubbed Kepler1b. A second planet is possibly responsible for fluctuations in the first's inclination. Kepler determined that it is the darkest known planet, blacker than coal, due to its extremely low dimming and brightening detected during transits. It would appear black except for some faint red tinge. This conflicts with current theories, which thought that a Hot Jupiter could only get as dark as Mercury. It appears that the planet is too hot for reflective clouds to form and instead its atmosphere contains light-absorbing chemicals. An off-the-cuff nickname Erebus (Greek god of darkness) has been suggested. It was also the first planet whose phases have been detected.
  • HAT-P-1 System (2006) - A stellar binary believed to contain the planet with the biggest known diameter and the least dense. This would have been only the second planet with such a low density. Later measurements showed it wasn't that inflated, and has the expected radius for a highly irradiated core-less Hot Jupiter.
  • HAT-P-5 System (2007) - A Jupiter-like Hot Jupiter transiting a bright star.
  • OGLE-TR-182 System (Oct 2007) - Contains the 6th discovered OGLE transiting planet. It is considered a typical hot jupiter.

Dense Core Hot Jupiters

  • WASP-2 System (Sep 06) - Contains second planet discovered by WASP program. This planet is a rather heavy transiting planet, has a large rocky core, and conforms to present models (in contrast to WASP-1). One of the 6 out of 27 planets analyzed by the WASP team found to orbit backwards around its star in 2010. Shows signs of atmospheric blow-off.
  • HD 149026 System (May 07) - Contains the first Saturn mass transiting planet. Also the first planet found with a dense core, leading credence to the core-accretion theory. Sometimes called a Super-Neptune, though it is not known if its core is rocky or icy. Also the first TEP discovered smaller than Jupiter. It was revealed to be as black as coal, twice as hot as any other known exoplanet, and hotter than some stars.
  • HAT-P-3 System (Jun 07) - A heavy-element rich planet transiting a metal rich K dwarf star. Its small size 0.89 JR for its mass 0.6 MJ indicates it has a rocky core.
  • CoRoT-13 System (Jun 10) - One of seven transiting exoplanet systems discovered by CoRoT announced in Jun 2010. Smaller than Jupiter, but twice as dense, suggesting a massive rocky core.

Super Neptunes

Planets smaller than Jupiter, but larger than Neptune. They are massive and dense, indicating a large rocky or icy core.

  • Gliese 436 System (May 07) - The second known red dwarf planetary system. Contains one of the first Neptunians discovered. Planet b temporarily later found to be the smallest exoplanet (about Uranus' diameter, though over 50% its mass) known to transit its host star and is currently the nearest (33 ly). Its temperature (712K) was measured to be higher than what it would be purely from radiation (520K), perhaps due to a greenhouse effect, somewhat higher than Venus. It was originally thought to have a layer of "hot ice", water solidified due to high pressures. It turned out that it was larger than thought and hot ice was not needed. It could still be a rocky super-Earth. It was later found to have a remarkably low levels of Methane and high levels of Carbon Monoxide for its 800K temperature. Possible explanations include Methane being changed into hydrocarbon polymers due to its star's ultraviolet radiation, CO being drafted upwards with winds, or observational defects. It's significant eccentricity suggests a possible neighboring planet. Planet c was announced to be the smallest known exoplanet (1.5 Earth's diameter), but was later retracted because variations in transit timing of the first planet did not occur and the proposed orbit would be unstable. It is still thought that a second planet of some kind is possible in the system.
  • HAT-P-11 System (Jan 09) - Star system with the second discovered transiting Super-Neptune and the least massive transiting planet known at the time. Also observed by Kepler and dubbed "Kepler 3b".

Eccentric Jupiters

  • HD 80606 System (2009) - Multiple star system with a planet, which has a higher period (111 days) than any other known transiting planet and highest eccentricty (Halley's comet-like). Discovered in 2001, but found to transit in 2009. Its orbit brings it from epistellar distances to Earth-like distances. Planet is the first one for which changes in weather have been observed. Potassium was detected from the high wind regions of the exosphere. In 2010 it was found to be only one of the two out of all 79 known transiting exoplanetary systems that could not support a habitable Earth-like planet, since its elongated orbit would destabilize any such planets.
  • CoRoT-10 System (Jun 10) - One of seven transiting exoplanet systems discovered by CoRoT announced in Jun 2010. Has an extremely eccentric orbit that causes a tenfold difference in stellar radiation (250 to 600 C) over its 13 day period.

Neptunians

  • CoRoT-8 System (Jun 10) - One of seven transiting exoplanet systems discovered by CoRoT announced in Jun 2010. Contains the smallest of the bunch, which is 70% as large and massive as Saturn, and second smallest found by CoRoT at the time. Should have an internal structure similar to Neptune.
  • Gliese 436 System - The second known red dwarf planetary system. Contains one of the first Neptunians discovered. Planet b temporarily later found to be the smallest exoplanet (about Uranus' diameter, though over 50% its mass) known to transit its host star and is currently the nearest (33 ly). Its temperature (712K) was measured to be higher than what it would be purely from radiation (520K), perhaps due to a greenhouse effect, somewhat higher than Venus. It was originally thought to have a layer of "hot ice", water solidified due to high pressures. It turned out that it was larger than thought and hot ice was not needed. It could still be a rocky super-Earth. It was later found to have a remarkably low levels of Methane and high levels of Carbon Monoxide for its 800K temperature. Possible explanations include Methane being changed into hydrocarbon polymers due to its star's ultraviolet radiation, CO being drafted upwards with winds, or observational defects. It's significant eccentricity suggests a possible neighboring planet. Planet c was announced to be the smallest known exoplanet (1.5 Earth's diameter), but was later retracted because variations in transit timing of the first planet did not occur and the proposed orbit would be unstable. It is still thought that a second planet of some kind is possible in the system.
  • Kepler 4 System - One of first transiting exoplanets discovered by Kepler announced in a batch of 5 Jan 2010 (Kepler 4-9). This system has the lowest assigned Kepler number, as Kepler 1-3 had been discovered by earlier studies. The only Hot Neptunian in the initial batch and about 3.8 RE.
  • HAT-P-11 System - Star system with the second discovered transiting Super-Neptune and the least massive transiting planet known at the time. Also observed by Kepler and dubbed "Kepler 3b".
  • HAT-P-26 System - Template:HAT-P-26 System

Super Earths

  • GJ 1214 System - A red dwarf system containing the first exoplanet discovered by the MEarth project, which seeks to detect transiting Earth-like planets around nearby red dwarves, and the second transiting super-Earth. The planet is the first of a new class of planets with low mass and low density. It is between Earth and Neptune in radius and it could be a small Neptunian, a terrestrial with an outgassed atmosphere, or a water world. Its featureless spectrum (the first Super Earth atmosphere ever studied) suggests a heavy atmosphere choked with water steam or one with thick water clouds above it, making viewing the surface impossible (further studies should resolve this). It may be the coolest transiting planet detected. Its close proximity (under 50 ly) assures promising future observation.
  • CoRoT-7 System - A sunlike star about 500 light years away with two Hot Super Earths (and possibly a third), including the first detected transiting Super-Earth. It a diameter about twice that of the Earth. First exoplanet with evidence of a solid surface and does not possess a thick atmosphere. Because its star is active, its mass is somewhat uncertain (2.3 to 8.5 ME), which makes it unclear if the planet actually has a solid surface. Also the closest exoplanet to its star known and has the smallest orbit period (0.85 Earth Days). Likely the first Super-Io discovered (due to slight eccentricity) and the first gas giant remnant core found. Has temperature of 1000-1500C. Planet c is a larger Neptunian orbiting further away and does not transit.

Special Observation Types

Atmospheric Blow-Off

  • OGLE-TR-10 System (Theoretical) - Contains a bloated Hot Jupiter expected to be losing its atmosphere. Noted for its similarity to the first transiting exoplanet. Thought to not be so bloated, but then confirmed to really be bloated. Found to have the lowest measured surface gravity of any of the transiting exoplanets, considerably less than Earth. 5th confirmed OGLE planet.
  • WASP-1 System - Has the first planet detected by the WASP program, which is the third "inflated" Hot Jupiter detected, which suggested these planets were fairly common. It was nicknamed "Garafía-1" after the municipality that hosts the Roque de Los Muchachos Observatory. Was the largest known exoplanet for about a year. Shows signs of atmospheric blow-off.
  • WASP-2 System - Contains second planet discovered by WASP program. This planet is a rather heavy transiting planet, has a large rocky core, and conforms to present models (in contrast to WASP-1). One of the 6 out of 27 planets analyzed by the WASP team found to orbit backwards around its star in 2010. Shows signs of atmospheric blow-off.
  • WASP-3 System - One of three systemss discovered by Super WASP containing a transiting planet so close to its star that it is evaporating. Like the other two, WASP-4 and 5, it is incapable of radiating away heat from its star and instead swells up to significantly larger than Jupiter. This is a planet 81% more massive than Jupiter with 13% larger radius going around in just less day 2 days. Its transit time varies by up to 3 minutes, which indicates that a further planet may be in this system. This would be a further Neptunian planet and would be the first exoplanet detected by measuring eclipse timing deviations of an earlier discovered planet (Transit Timing Variation method). Further observations are needed to confirm the planet, but the best fit is that it is in 2:1 resonance with the larger planet.
  • WASP-4 System - One of three systemss discovered by Super WASP containing a transiting planet so close to its star that it is evaporating.
  • WASP-5 System - One of three systems discovered by Super WASP containing a transiting planet so close to its star that it is evaporating. Found to orbit in the same manner as its star's rotation, while 6 out of 27 planets analyzed by the WASP team were found to orbit backwards around its star in 2010. Has a candidate planet detected by the Transit Timing Variation method.

Retrograde Hot Jupiters

  • WASP-2 System - Contains second planet discovered by WASP program. This planet is a rather heavy transiting planet, has a large rocky core, and conforms to present models (in contrast to WASP-1). One of the 6 out of 27 planets analyzed by the WASP team found to orbit backwards around its star in 2010. Shows signs of atmospheric blow-off.
  • WASP-8 System - One of the 6 out of 27 planets analysed by the WASP team found to orbit backwards around its star in 2010.
  • WASP-15 System - One of the 6 out of 27 planets analysed by the WASP team found to orbit backwards around its star in 2010.
  • WASP-17 System - An F6 type star which has the first exoplanet discovered in a retrograde orbit. Also the largest known exoplanet at 1.74 RJ and 0.5 JM. Discovered by transit. It may be "flipping" its star's axis. Orbit hints at a near planetary collision in its early years. One of the 6 out of 27 planets analyzed by the WASP team found to orbit backwards around its star in 2010. It was found to be abundant in CO, depleted in water and methane. It lacks a prominent stratosphere and has efficient day-night energy circulation.
  • WASP-33 System - Aka HD 15082, this is the only known Delta Scuti variable star (kA5 hA8 mF4) known to host a planet. The star is much hotter than the Sun and 50% more massive. The planet is a retrograde inflated hot super Jupiter and is by far hottest measured exoplanet (3150C), 900C hotter than WASP-12b, and hotter than some red dwarf stars. It is one of the 6 out of 27 planets analyzed by the WASP team found to orbit backwards around its star in 2010. The planet may be responsible for the star's pulsations.

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