Discoveries of exoplanets
An exoplanet (extrasolar planet) is a planet located outside the Solar System. The first evidence of an exoplanet was noted as early as 1917, but was not recognized as such. However, the first scientific detection of an exoplanet began in 1988. Shortly afterwards, the first confirmed detection came in 1992, with the discovery of several terrestrial-mass planets orbiting the pulsar PSR B1257+12. The first confirmation of an exoplanet orbiting a main-sequence star was made in 1995, when a giant planet was found in a four-day orbit around the nearby star 51 Pegasi. Some exoplanets have been imaged directly by telescopes, but the vast majority have been detected through indirect methods, such as the transit method and the radial-velocity method. As of 1 November 2018, there are 3,874 confirmed planets in 2,892 systems, with 638 systems having more than one planet. This is a list of the most notable discoveries.
- Gamma Cephei Ab: The radial velocity variations of the star Gamma Cephei were announced in 1989, consistent with a planet in a 2.5-year orbit. However, misclassification of the star as a giant combined with an underestimation of the orbit of the Gamma Cephei binary, which implied the planet's orbit would be unstable, led some astronomers to suspect the variations were merely due to stellar rotation. The existence of the planet was finally confirmed in 2002.
- HD 114762 b: This object has a minimum mass 11 times the mass of Jupiter and has an 89-day orbit. At the time of its discovery it was regarded as a probable brown dwarf, although subsequently it has been included in catalogues of extrasolar planets.
- PSR B1257+12: The first confirmed discovery of extrasolar planets was made in 1992 when a system of terrestrial-mass planets was announced to be present around the millisecond pulsar PSR B1257+12.
- 51 Pegasi b: In 1995 this became the first exoplanet orbiting a main-sequence star to have its existence confirmed. It is a hot Jupiter with a 4.2-day orbit.
- 47 Ursae Majoris b: In 1996 this Jupiter-like planet was the first long-period planet discovered, orbiting at 2.11 AU from the star with the eccentricity of 0.049. There is a second companion that orbits at 3.39 AU with the eccentricity of 0.220 ± 0.028 and a period of 2190 ± 460 days.
- Gliese 876 b: In 1998, the first planet was found that orbits around a red dwarf star (Gliese 876). It is closer to its star than Mercury is to the Sun. More planets have subsequently been discovered even closer to the star.
- Upsilon Andromedae: The first multiple-planetary system to be discovered around a main sequence star. It contains three planets, all of which are Jupiter-like. Planets b, c, d were announced in 1996, 1999, and 1999 respectively. Their masses are 0.687, 1.97, and 3.93 MJ; they orbit at 0.0595, 0.830, and 2.54 AU respectively. In 2007 their inclinations were determined as non-coplanar.
- HD 209458 b: After being originally discovered with the radial-velocity method, this became the first exoplanet to be seen transiting its parent star. The transit detection conclusively confirmed the existence of the planets suspected to be responsible for the radial velocity measurements.
- HD 209458 b: Astronomers using the Hubble Space Telescope announced that they had detected the atmosphere of HD 209458 b. They found the spectroscopic signature of sodium in the atmosphere, but at a smaller intensity than expected, suggesting that high clouds obscure the lower atmospheric layers. In 2008 the albedo of its cloud layer was measured, and its structure modeled as stratospheric.
- Iota Draconis b: The first planet discovered around the giant star Iota Draconis, an orange giant. This provides evidence for the survival and behavior of planetary systems around giant stars. Giant stars have pulsations that can mimic the presence of planets. The planet is very massive and has a very eccentric orbit. It orbits on average 27.5% further from its star than Earth does from the Sun. In 2008 the system's origin would be traced to the Hyades cluster, alongside Epsilon Tauri.
- PSR B1620-26 b: On July 10, using information obtained from the Hubble Space Telescope, a team of scientists led by Steinn Sigurðsson confirmed the oldest extrasolar planet yet. The planet is located in the globular star cluster M4, about 5,600 light years from Earth in the constellation Scorpius. This is one of only three planets known to orbit around a stellar binary; one of the stars in the binary is a pulsar and the other is a white dwarf. The planet has a mass twice that of Jupiter, and is estimated to be 12.7 billion years old.
- Mu Arae c: In August, a planet orbiting Mu Arae with a mass of approximately 14 times that of the Earth was discovered with the European Southern Observatory's HARPS spectrograph. Depending on its composition, it is the first published "hot Neptune" or "super-Earth".
- 2M1207 b: The first planet found around a brown dwarf. The planet is also the first to be directly imaged (in infrared). According to an early estimate, it has a mass 5 times that of Jupiter; other estimates give slightly lower masses. It was originally estimated to orbit at 55 AU from the brown dwarf. The brown dwarf is only 25 times as massive as Jupiter. The temperature of the gas giant planet is very high (1250 K), mostly due to gravitational contraction. In late 2005, the parameters were revised to orbital radius 41 AU and mass of 3.3 Jupiters, because it was found that the system is closer to Earth than was originally believed. In 2006, a dust disk was found around 2M1207, providing evidence for active planet formation.
- TrES-1 and HD 209458b: On March 22, two groups announced the first direct detection of light emitted by exoplanets, achieved with the Spitzer Space Telescope. These studies permitted the direct study of the temperature and structure of the planetary atmospheres.
- Gliese 876 d: On June 13, a third planet orbiting the red dwarf star Gliese 876 was announced. With a mass estimated at 7.5 times that of Earth, it may be rocky in composition. The planet orbits at 0.021 AU with a period of 1.94 days.
- HD 149026 b: This planet was announced on July 1. Its unusually high density indicated that it was a giant planet with a large core, the largest one yet known. The mass of the core was estimated at 70 Earth masses (as of 2008, 80-110), accounting for at least two-thirds of the planet's total mass.
- OGLE-2005-BLG-390Lb: This planet, announced on January 25, was detected using the gravitational microlensing method. It orbits a red dwarf star around 21,500 light years from Earth, toward the center of the Milky Way galaxy. As of April 2010, it remains the most distant known exoplanet. Its mass is estimated to be 5.5 times that of Earth. Prior to this discovery, the few known exoplanets with comparably low masses had only been discovered in orbits very close to their parent stars, but this planet is estimated to have a relatively wide separation of 2.6 AU from its parent star. Due to that wide separation and due to the inherent dimness of the star, the planet is probably the coldest exoplanet known.
- HD 69830: Has a planetary system with three Neptune-mass planets. It is the first triple planetary system without any Jupiter-like planets discovered around a Sun-like star. All three planets were announced on May 18 by Lovis. All three orbit within 1 AU. The planets b, c and d have masses of 10, 12 and 18 times that of Earth, respectively. The outermost planet, d, appears to be in the habitable zone, shepherding a thick asteroid belt.
- HD 209458 b and HD 189733 b: These became the first extrasolar planets to have their atmospheric spectra directly observed. The announcement was made on February 21, by two groups of researchers who had worked independently. One group, led by Jeremy Richardson of NASA's Goddard Space Flight Center, observed the atmosphere of HD 209458 b over a wavelength range from 7.5 to 13.2 micrometres. The results were surprising in several ways. The 10-micrometre spectral peak of water vapor was absent. An unpredicted peak was observed at 9.65 micrometres, which the investigators attributed to clouds of silicate dust. Another peak, at 7.78 micrometres, remained unexplained. The other group, led by Carl Grillmair of NASA's Spitzer Science Center, observed HD 189733 b. They also failed to detect the spectroscopic signature of water vapor. Later in the year, yet another group of researchers using a somewhat different technique succeeded in detecting water vapor in the planet's atmosphere, the first time such a detection had been made.
- Gliese 581 c: A team of astronomers led by Stephane Udry used the HARPS instrument on the European Southern Observatory's 3.6-meter telescope to discover this exoplanet by means of the radial velocity method. The team calculated that the planet could support liquid water and possibly life. However, subsequent habitability studies indicate that the planet likely suffers from a runaway greenhouse effect similar to Venus, rendering the presence of liquid water impossible. These studies suggest that the third planet in the system, Gliese 581 d, is more likely to be habitable. Seth Shostak, a senior astronomer with the SETI institute, stated that two unsuccessful searches had already been made for radio signals from extraterrestrial intelligence in the Gliese 581 system.
- Gliese 436 b: This planet was one of the first Neptune-mass planets discovered, in August 2004. In May 2007, a transit was found, revealed as the smallest and least massive transiting planet yet at 22 times that of Earth. Its density is consistent with a large core of an exotic form of solid water called "hot ice", which would exist, despite the planet's high temperatures, because the planet's gravity causes water to be extremely dense.
- TrES-4: The largest-diameter and lowest-density exoplanet to date, TrES-4 is 1.7 times Jupiter's diameter but only 0.84 times its mass, giving it a density of just 0.2 grams per cubic centimeter—about the same as balsa wood. It orbits its primary closely and is therefore quite hot, but stellar heating alone does not appear to explain its large size.
- OGLE-2006-BLG-109Lb and OGLE-2006-BLG-109Lc: On February 14, the discovery of a planetary system was announced that is the most similar one known to the Jupiter-Saturn pair within the Solar System in terms of mass ratio and orbital parameters. The presence of planets with such parameters has implications for possible life in a solar system as Jupiter and Saturn have a stabilizing effect to the habitable zone by sweeping away large asteroids from the habitable zone.
- HD 189733 b: On March 20, follow-up studies to the first spectral analyses of an extrasolar planet were published in the scientific journal Nature, announcing evidence of an organic molecule found on an extrasolar planet for the first time. The analysis showed not only water vapor, but also methane existing in the atmosphere of the giant gas planet. Although conditions on there are too harsh to harbor life, it still is the first time a key molecule for organic life was found on an extrasolar planet.
- HD 40307: On June 16, Michel Mayor announced a planetary system with three super-Earths orbiting this K-type star. The planets have masses ranging from 4 to 9 Earth masses and periods ranging from 4 to 20 days. It was suggested this might be the first multi-planet system without any known gas giants. However, a subsequent study of the system's orbital stability found that tidal interactions have had little effect on evolution of the planets' orbits. That, in turn, suggests that the planets experience relatively low tidal dissipation and hence are of primarily gaseous composition. All three were discovered by the HARPS spectrograph in La Silla, Chile.
- 1RXS J160929.1−210524: In September, an object was imaged in the infrared at a separation of 330AU from this star. Later, in June 2010, the object was confirmed to be a companion planet to the star rather than a background object aligned by chance.
- Fomalhaut b: On November 13, NASA and the Lawrence Livermore National Laboratory announced the discovery of an extrasolar planet orbiting just inside the debris ring of the A class star Fomalhaut (Alpha Piscis Austrini). This was the first extrasolar planet to be directly imaged by an optical telescope. Its mass is estimated to be three times that of Jupiter. Based on the planet's unexpected brightness at visible wavelengths, the discovery team suspects it is surrounded by its own large disk or ring that may be a satellite system in the process of formation.
- HR 8799: Also on November 13, the discovery of three planets orbiting HR 8799 was announced. This was the first direct image of multiple planets. Christian Marois of the National Research Council of Canada's Herzberg Institute of Astrophysics and his team used the Keck and Gemini telescopes in Hawaii. The Gemini images allowed the international team to make the initial discovery of two of the planets with data obtained on October 17, 2007. Then, in July through September 2008 the team confirmed this discovery and found a third planet orbiting even closer to the star with images obtained at the Keck II telescope. A review of older data taken in 2004 with the Keck II telescope revealed that the outer 2 planets were visible on these images. Their masses and separations are approximately 7 MJ at 24 AU, 7 MJ at 38 AU, and 5 MJ at 68 AU.
- COROT-7b: On February 3, the European Space Agency announced the discovery of a planet orbiting the star COROT-7. Although the planet orbits its star at a distance less than 0.02 AU, its diameter is estimated to be around 1.7 times that of Earth, making it the smallest super-Earth yet measured. Due to its extreme closeness to its parent star, it is believed to have a molten surface at a temperature of 1000–1500 °C. It was discovered by the French COROT satellite.
- Gliese 581 e: On April 21, the European Southern Observatory announced the discovery of a fourth planet orbiting the star Gliese 581. The planet orbits its parent star at a distance of less than 0.03 AU and has a minimum mass estimated at 1.9 times that of Earth. As of January 2010, this is the lightest known extrasolar planet to orbit a main-sequence star.
- 30 planets: On October 19, it was announced that 30 new planets were discovered, all were detected by radial velocity method. It is the most planets ever announced in a single day during the exoplanet era[clarification needed]. October 2009 now holds the most planets discovered in a month, breaking the record set in June 2002 and August 2009, during which 17 planets were discovered.
- 61 Virginis and HD 1461: On December 14, three planets (one is super-Earth and two are Neptune-mass planets) were discovered. Also a super-Earth planet and two unconfirmed planets around HD 1461 were discovered. These discoveries indicated that low-mass planets that orbit around nearby stars are very common. 61 Virginis is the first star like the Sun to host the super-Earth planets.
- GJ 1214 b: On December 16, a super-Earth planet was discovered by transit. The determination of density from mass and radius suggest that this planet may be an ocean planet composed of 75% water and 25% rock. Some of the water on this planet should be in the exotic form of ice VII. This is the first planet discovered by MEarth Project, which is used to look for transits of super-Earth planets crossing the face of M-type stars.
- 47 Ursae Majoris d: On March 6, a gas giant like Jupiter with the longest known orbital period for any exoplanet was detected via radial velocity. It orbits its parent star at a distance similar to Saturn in the Solar System with its orbital period lasting about 38 Earth years.
- COROT-9b: On March 17, the first known temperate transiting planet was announced. Discovered by the COROT satellite, it has an orbital period of 95 days and a periastron distance of 0.36 AU, by far the largest of any exoplanet whose transit has been observed. The temperature of the planet is estimated at between 250 K and 430 K (between -20 °C and 160 °C).
- Beta Pictoris b: On June 10, for the first time astronomers have been able to directly follow the motion of an exoplanet as it moves to the other side of its host star. The planet has the smallest orbit so far of all directly imaged exoplanets, lying as close to its host star as Saturn is to the Sun.
- HD 209458 b: On June 23, astronomers announced they have measured a superstorm for the first time in the atmosphere of HD 209458 b. The very high-precision observations done by ESO’s Very Large Telescope and its powerful CRIRES spectrograph of carbon monoxide gas show that it is streaming at enormous speed from the extremely hot day side to the cooler night side of the planet. The observations also allow another exciting “first” — measuring the orbital speed of the exoplanet itself, providing a direct determination of its mass.
- HD 10180: On August 24, astronomers using ESO’s HARPS instrument announced the discovery of a planetary system with up to seven planets orbiting a Sun-like star with five confirmed Neptune-mass planets and evidence of two other planets, one of which could have the lowest mass of any planet found to date orbiting a main-sequence star, and the other of which may be a long-period Saturnian planet. Additionally, there is evidence that the distances of the planets from their star follow a regular pattern, as seen in the Solar System.
- Kepler 11: On February 3, astronomers using NASA's Kepler Mission announced the discovery of 6 transiting planets orbiting the star Kepler 11. Masses were confirmed using a new method called Transit Timing Variations. The architecture of the system is unique with 6 low mass, low density planets all packed in tight orbits around their host star. The 5 inner planets all orbit inside that of Mercury in the Solar System. It is believed that these planets formed out past the snow line and migrated into their current position.
- 55 Cancri e: On April 27, 2011, the super-earth 55 Cancri e was found to transit its host star using the MOST satellite. This planet has the shortest known orbital period of any extrasolar planet at .73 days. It is also the first time a super earth has been detected transiting a naked eye star (less than 6th magnitude in V band). The high density calculated suggests that the planet has a "rock-iron composition supplemented by a significant mass of water, gas, or other light elements".
- Alpha Centauri Bb: On 16 October 2012, the discovery was announced of an Earth-mass planet in orbit around Alpha Centauri B. The discovery was published online on the 17 of October, in the scientific journal Nature, and the lead author of the paper was Xavier Dumusque, a graduate student at the Centro de Astrofísica da Universidade do Porto (Centre for Astrophysics of the University of Porto). The discovery of a planet in the closest star system to Earth received widespread media attention, and was seen as an important landmark in exoplanet research.
- PH2 b: On 3 January 2013, the discovery of a "Jupiter-size" extrasolar planet that could "potentially be habitable" was announced. The exoplanet was discovered by amateur astronomers from the Planet Hunters project of amateur astronomers using data from the Kepler Mission space observatory and confirmed, with 99.9 percent confidence, by observations at the W. M. Keck Observatory in Hawaii. PH2 b is the second confirmed planet discovered by PlanetHunters.org (the first being PH1).
- Kepler-69c (formerly KOI-172.02): On 7 January 2013, the discovery of an unconfirmed (Kepler Object of Interest) candidate exoplanet was announced by astronomers affiliated with the Kepler Mission space observatory. The candidate object, a Super-Earth, has a radius 1.54 times that of Earth. Kepler-69c orbits a sun-like star, named Kepler-69, within the "habitable zone" a zone where liquid water could exist on the surface of the planet. Scientists claim the exoplanet, if confirmed, could be a "prime candidate to host alien life".
- On 18 April 2013, NASA announced the discovery of three new Earth-like exoplanets – Kepler-62e, Kepler-62f, and Kepler-69c (now confirmed) – in the habitable zones of their respective host stars, Kepler-62 and Kepler-69. The new exoplanets, which are considered prime candidates for possessing liquid water and thus potentially life, were identified using the Kepler space observatory.
- On 26 February 2014, NASA announced the discovery of 715 newly verified exoplanets around 305 stars by the Kepler Space Telescope. The exoplanets were found using a statistical technique called "verification by multiplicity". 95% of the discovered exoplanets were smaller than Neptune and four, including Kepler-296f, were less than 2 1/2 the size of Earth and were in habitable zones where surface temperatures are suitable for liquid water.
- In November 2014, the Planet Hunters group discovered the exoplanet PH3 c. This exoplanet is 700 parsecs away from Earth, is a low density planet and is four times as massive as Earth.
- In July, 2014, NASA announced the determination of the most precise measurement so far attained for the size of an exoplanet (Kepler-93b); the discovery of an exoplanet (Kepler-421b) that has the longest known year (704 days) of any transiting planet found so far; and, finding very dry atmospheres on three exoplanets (HD 189733b, HD 209458b, WASP-12b) orbiting sun-like stars.
- On 6 January 2015, NASA announced the 1000th confirmed exoplanet discovered by the Kepler Space Telescope. Three of the newly confirmed exoplanets were found to orbit within habitable zones of their host stars: two of the three, Kepler-438b and Kepler-442b, are near-Earth-size and likely rocky; the third, Kepler-440b, is a super-Earth. Similar confirmed small exoplanets in habitable zones found earlier by Kepler include: Kepler-62e, Kepler-62f, Kepler-186f, Kepler296e and Kepler-296f.
- On 23 July 2015, NASA announced the release of the Seventh Kepler Candidate Catalog, bringing the total number of confirmed exoplanets to 1030 and the number of exoplanet candidates to 4,696. This announcement also included the first report of Kepler-452b, a near-Earth-size planet orbiting the habitable zone of a G2-type star, as well as eleven other "small habitable zone candidate planets".
- On 30 July 2015, NASA confirmed the discovery of the nearest rocky planet outside the Solar System, larger than Earth, 21 light-years away. HD 219134 b is the closest exoplanet to Earth to be detected transiting in front of its star. The planet has a mass 4.5 times that of Earth, a radius about 1.6 times that of Earth, with a three-day orbit around its star. Combining the size and mass gives it a density of 6 g/cm3, confirming that it is a rocky planet.
- In September 2015, astronomers reported the unusual light fluctuations of KIC 8462852, an F-type main-sequence star in the constellation Cygnus, as detected by the Kepler space telescope, while searching for exoplanets. Various explanations have been presented, including those based on comets, asteroids, as well as, an alien civilization.
- On August 24, 2016, the Pale Red Dot campaign announced the discovery of Proxima b. Orbiting the closest star to the solar system, Proxima Centauri, the 1.3 Earth-mass exoplanet orbits within the star's habitable zone. The planet was discovered by the HARPS and UVES instruments on telescopes at the European Southern Observatory in Chile, after signs of a planet orbiting Proxima Centauri were first found in 2013.
- On 22 February 2017, several scientists working at the California Institute of Technology for NASA, using the Spitzer Space Telescope, announced the discovery of seven potentially habitable exoplanets orbiting TRAPPIST-1, a star about 40 light years away. Three of these planets are said to be located within the habitable zone of the TRAPPIST-1 solar system and have the potential to harbor liquid water on their surface and possibly sustain life. The discovery sets a new record for the greatest number of habitable-zone planets found around a single star outside our solar system. TRAPPIST-1 is a red dwarf, which raises the likelihood of the exoplanets orbiting TRAPPIST-1 being tidally locked with the parent star.
- Ross 128 b is a confirmed Earth-sized exoplanet, likely rocky, orbiting within the inner habitable zone of the red dwarf Ross 128. It is the second-closest potentially habitable exoplanet found, at a distance of about 11 light-years; only Proxima Centauri b is closer. The planet is only 35% more massive than Earth, receives only 38% more sunlight, and is expected to be a temperature suitable for liquid water to exist on the surface, if it has an atmosphere.
- Analyses show that K2-155d may fall into the habitable zone and support liquid water.
- WASP-104b, a Hot Jupiter exoplanet, has been considered by researchers to be one of the darkest exoplanets ever discovered.
- Helium has been detected for the first time in the atmosphere of an exoplanet by scientists observing WASP-107b.
- On 7 June, scientists working at the Physical Research Laboratory (PRL) for ISRO, using the PRL Advance Radial-velocity Abu-Sky Search (Paras) spectrograph integrated with a telescope at the Mount Abu InfraRed Observatory, announced the discovery of host star EPIC 211945201 or K2-236 and exoplanet EPIC 211945201b or K2-236b. Located at a distance of 600 light years from Earth, the exoplanet has a mass 27 times heavier than that of Earth, and is 6 times its radius. K2-236b has a surface temperature of 600°C.
- Landau, Elizabeth (12 November 2017). "Overlooked Treasure: The First Evidence of Exoplanets". NASA. Retrieved 1 November 2017.
- Wolszczan, A.; Frail, D. A. (1992). "A planetary system around the millisecond pulsar PSR1257 + 12". Nature. 355 (6356): 145–147. Bibcode:1992Natur.355..145W. doi:10.1038/355145a0.
- Schneider, J. "Interactive Extra-solar Planets Catalog". The Extrasolar Planets Encyclopedia. Retrieved 1 November 2018.
- Campbell, B.; Walker, G. A. H.; Yang, S. (1988). "A search for substellar companions to solar-type stars". The Astrophysical Journal. 331: 902. Bibcode:1988ApJ...331..902C. doi:10.1086/166608.
- Cochran, W.D.; et al. (2002). "A Planetary Companion to the Binary Star Gamma Cephei". Retrieved 2010-05-02.
- Walker, G.A.H. (2008). "The First High-Precision Radial Velocity Search for Extra-Solar Planets". New Astronomy Reviews. 56 (1): 9–15. arXiv:0812.3169v1. Bibcode:2012NewAR..56....9W. doi:10.1016/j.newar.2011.06.001.
- Latham, D. W.; Mayor, Michel; et al. (1989). "The unseen companion of HD114762 - A probable brown dwarf". Nature. 339 (6219): 38–40. Bibcode:1989Natur.339...38L. doi:10.1038/339038a0.
- Schneider, J. "Notes for star HD 114762". The Extrasolar Planets Encyclopaedia. Retrieved 2010-05-02.
- "HD 114762 b". Exoplanets Data Explorer. Archived from the original on 2010-07-07. Retrieved 2010-05-02.
- M. Mayor; et al. (2009). "The HARPS search for southern extra-solar planets: XVIII. An Earth-mass planet in the GJ 581 planetary system". Astronomy and Astrophysics. 507 (1): 487–494. arXiv:0906.2780. Bibcode:2009A&A...507..487M. doi:10.1051/0004-6361/200912172.
- J.N. Wilford (26 June 1998). "New Planet Detected Around a Star 15 Light Years Away". The New York Times. Retrieved 2008-07-17.
- B. Edgar; M. Watzke; C. Rasmussen. "Multiple planets discovered around Upsilon Andromedae". AFOE website. Retrieved 2009-12-06.
- D. Charbonneau; et al. (2000). "Detection of Planetary Transits Across a Sun-like Star". Astrophysical Journal Letters. 529 (1): L45–L48. arXiv:astro-ph/9911436. Bibcode:2000ApJ...529L..45C. doi:10.1086/312457.
- G.W. Henry; et al. (2000). "A Transiting "51 Peg-like" Planet". Astrophysical Journal Letters. 529 (1): L41–L44. Bibcode:2000ApJ...529L..41H. doi:10.1086/312458.
- D. Charbonneau; et al. (2002). "Detection of an Extrasolar Planet Atmosphere". Astrophysical Journal. 568 (1): 377–384. arXiv:astro-ph/0111544. Bibcode:2002ApJ...568..377C. doi:10.1086/338770.
- S. Frink; et al. (2002). "Discovery of a Substellar Companion to the K2 III Giant Iota Draconis". Astrophysical Journal. 576 (1): 478–484. Bibcode:2002ApJ...576..478F. doi:10.1086/341629.
- S. Sigurdsson; et al. (2003). "A Young White Dwarf Companion to Pulsar B1620-26: Evidence for Early Planet Formation". Science. 301 (5630): 193–196. arXiv:astro-ph/0307339. Bibcode:2003Sci...301..193S. doi:10.1126/science.1086326. PMID 12855802.
- "Fourteen Times the Earth – ESO HARPS Instrument Discovers Smallest Ever Extra-Solar Planet" (Press release). European Space Agency. 25 August 2004. Archived from the original on 2007-06-07. Retrieved 2006-05-07.
- "Astronomers Confirm the First Image of a Planet Outside of Our Solar System" (Press release). European Space Agency. 30 April 2005. Archived from the original on 6 August 2009. Retrieved 2009-12-06.
- S. Mohanty, R. Jayawardhana, N. Huelamo, E. Mamajek; Jayawardhana; Huélamo; Mamajek (2007). "The Planetary Mass Companion 2MASS 1207–3932B: Temperature, Mass, and Evidence for an Edge-on Disk". The Astrophysical Journal. 657 (2): 1064–1091. arXiv:astro-ph/0610550. Bibcode:2007ApJ...657.1064M. doi:10.1086/510877.
- D. Charbonneau; et al. (2005). "Detection of Thermal Emission from an Extrasolar Planet". Astrophysical Journal. 626 (1): 523–529. arXiv:astro-ph/0503457. Bibcode:2005ApJ...626..523C. doi:10.1086/429991.
- D. Deming; et al. (2005). "Infrared Radiation from an Extrasolar Planet". Nature (Submitted manuscript). 434 (7034): 740–743. arXiv:astro-ph/0503554. Bibcode:2005Natur.434..740D. doi:10.1038/nature03507. PMID 15785769.
- E.J. Rivera; et al. (2005). "A 7.5 M⊕ Planet Orbiting the Nearby Star GJ 876". Astrophysical Journal. 634 (1): 625–640. arXiv:astro-ph/0510508. Bibcode:2005ApJ...634..625R. doi:10.1086/491669.
- B. Sato; et al. (2005). "The N2K Consortium II: A Transiting Hot Saturn around HD 149026 with a Large Dense Core". Astrophysical Journal. 633 (1): 465–473. arXiv:astro-ph/0507009. Bibcode:2005ApJ...633..465S. doi:10.1086/449306.
- J.-P. Beaulieu; Fouqué, P.; Williams, A.; Dominik, M.; Jørgensen, U. G.; Kubas, D.; Cassan, A.; Coutures, C.; Greenhill, J.; Hill, K.; Menzies, J.; Sackett, P. D.; Albrow, M.; Brillant, S.; Caldwell, J. A. R.; Calitz, J. J.; Cook, K. H.; Corrales, E.; Desort, M.; Dieters, S.; Dominis, D.; Donatowicz, J.; Hoffman, M.; Kane, S.; Marquette, J.-B.; Martin, R.; Meintjes, P.; Pollard, K.; Sahu, K. (2006). "Discovery of a Cool Planet of 5.5 Earth Masses Through Gravitational Microlensing". Nature. 439 (7075): 437–440. arXiv:astro-ph/0601563. Bibcode:2006Natur.439..437B. doi:10.1038/nature04441. PMID 16437108.
- "Kiwis help discover new planet". One News. 26 January 2006. Retrieved 2006-05-07.
- "Trio of Neptunes and their belt" (Press release). European Space Agency. 18 May 2006. Retrieved 2007-06-09.
- NASA's Spitzer First To Crack Open Light of Faraway Worlds Archived 2007-07-15 at the Wayback Machine. Spitzer.caltech.edu 2007-02-21 Retrieved on 2008-07-17
- L. Jeremy Richardson, Drake Deming, Karen Horning, Sara Seager, Joseph Harrington; Deming; Horning; Seager; Harrington (2007). "A spectrum of an extrasolar planet". Nature. 445 (7130): 892–5. arXiv:astro-ph/0702507. Bibcode:2007Natur.445..892R. doi:10.1038/nature05636. PMID 17314975.
- C.J. Grillmair; D. Charbonneau; A. Burrows; et al. (2007). "A Spitzer Spectrum of the Exoplanet HD 189733b". Astrophysical Journal Letters. 658 (2): L115. arXiv:astro-ph/0702494. Bibcode:2007ApJ...658L.115G. doi:10.1086/513741.
- "'Clear Signs of Water' on Distant Planet".
- Giovanna Tinetti; Alfred Vidal-Madjar; Mao-Chang Liang; et al. (2007). "Water vapour in the atmosphere of a transiting extrasolar planet". Nature. 448 (7150): 169–71. arXiv:0707.3064. Bibcode:2007Natur.448..169T. doi:10.1038/nature06002. PMID 17625559.
- Udry; et al. (2007). "The HARPS search for southern extra-solar planets, XI. Super-Earths (5 and 8 M⊕) in a 3-planet system". Astronomy and Astrophysics. 469 (3): L43–L47. arXiv:0704.3841. Bibcode:2007A&A...469L..43U. doi:10.1051/0004-6361:20077612.
- Ker Than (2007-04-24). "Major Discovery: New Planet Could Harbor Water and Life". Retrieved 2007-04-24.
- Selsis; et al. (2007). "Habitable planets around the star Gl 581?". Astronomy and Astrophysics. 476 (3): 1373–1387. arXiv:0710.5294. Bibcode:2007A&A...476.1373S. doi:10.1051/0004-6361:20078091.
- von Bloh et al. (2007) von Bloh, W.; Bounama, C.; Cuntz, M.; Franck, S. (2007). "The Habitability of Super-Earths in Gliese 581". Astronomy & Astrophysics. 476 (3): 1365–1371. doi:10.1051/0004-6361:20077939. Retrieved 2008-07-20.
- Fox, Maggie (2007-05-16). "Hot "ice" may cover recently discovered planet". Reuters. Retrieved 2009-04-23.
- "Largest Known Exoplanet Discovered". SPACE.com. 2007-08-06. Retrieved 2007-08-26.
- "Solar System Like Ours Found". SPACE.com. 2008-02-14. Retrieved 2008-02-19.
- "Key Organic Molecule Detected at Extrasolar Planet". SPACE.com. 2008-03-20. Retrieved 2008-03-20.
- Barnes; et al. (2009-01-13). "The HD 40307 Planetary System: Super-Earths or Mini-Neptunes?". Astrophysical Journal. 695 (2): 1006–1011. arXiv:0901.1698. Bibcode:2009ApJ...695.1006B. doi:10.1088/0004-637X/695/2/1006.
- Mayor; et al. (2008-06-16). "Trio of 'super-Earths' discovered". BBC news. London. Retrieved 2008-06-17.
- Astronomers verify directly imaged planet Archived June 30, 2010, at the Wayback Machine.
- "From afar, the first optical photos of an exoplanet". AFP. 2008-11-13. Archived from the original on 2008-12-20.
- "Hubble Directly Observes a Planet Orbiting Another Star". Retrieved November 13, 2008.
- John Timmer (2008-11-13). "Three planets directly observed orbiting distant star". Retrieved November 13, 2008.
- "Exoplanets finally come into view". London: BBC News. 2008-11-13. Retrieved 2009-04-23.
- "ESA Portal — COROT discovers smallest exoplanet yet, with a surface to walk on". Esa.int. 2009-02-03. Retrieved 2009-04-23.
- "New discoveries suggest low-mass planets are common around nearby stars". Astronomy.com. 2009-12-14. Retrieved 2009-12-21.
- "Astronomers find super-Earth using amateur, off-the-shelf technology". Astronomy.com. 2009-12-16. Retrieved 2009-12-21.
- Deeg, H. J.; Moutou, C.; Erikson, A.; Csizmadia, S; Tingley, B; Barge, P; Bruntt, H; Havel, M; Aigrain, S; Almenara, J. M.; Alonso, R.; Auvergne, M.; Baglin, A.; Barbieri, M.; Benz, W.; Bonomo, A. S.; Bordé, P.; Bouchy, F.; Cabrera, J.; Carone, L.; Carpano, S.; Ciardi, D.; Deleuil, M.; Dvorak, R.; Ferraz-Mello, S.; Fridlund, M.; Gandolfi, D.; Gazzano, J.-C.; Gillon, M.; et al. (2010). "A transiting giant planet with a temperature between 250 K and 430 K". Nature. 464 (7287): 384–387. Bibcode:2010Natur.464..384D. doi:10.1038/nature08856. PMID 20237564.
- "Exoplanet Caught on the Move". 2010-06-10. Retrieved 10 June 2010.
- Ignas A. G. Snellen; et al. (2010). "The orbital motion, absolute mass and high-altitude winds of exoplanet HD 209458b". Nature. 465 (7301): 1049–1051. arXiv:1006.4364. Bibcode:2010Natur.465.1049S. doi:10.1038/nature09111. PMID 20577209.
- "Richest Planetary System Discovered". 2010-08-24. Retrieved 24 August 2010.
- Lissauer, Jack J.; et al. (3 February 2011). "A closely packed system of low-mass, low-density planets transiting Kepler-11". Nature. 470 (7332): 53–58. arXiv:1102.0291. doi:10.1038/nature09760. PMID 21293371. Retrieved 2012-01-07.
- Winn, Joshua N.; et al. (27 April 2011). "A Super-Earth Transiting a Naked-Eye Star". The Astrophysical Journal. 737: L18. arXiv:1104.5230. doi:10.1088/2041-8205/737/1/L18.
- Wang, Ji; et al. (January 3, 2013). "Planet Hunters. V. A Confirmed Jupiter-Size Planet in the Habitable Zone and 42 Planet Candidates from the Kepler Archive Data". The Astrophysical Journal. 776 (1): 10. arXiv:1301.0644v1. Bibcode:2013ApJ...776...10W. doi:10.1088/0004-637x/776/1/10.
- Howell, Elizabeth (January 13, 2013). "Amateur Astronomers Discover 42 Alien Planets". Space.com. Retrieved January 13, 2013.
- Harrington, J. D.; Johnson, Michele (January 7, 2013). "NASA'S Kepler Mission Discovers 461 New Planet Candidates". NASA. Retrieved January 11, 2013.
- Moskowitz, Clara (January 9, 2013). "Most Earth-Like Alien Planet Possibly Found". Space.com. Retrieved January 9, 2013.
- Staff. "NASA Exoplanet Archive-KOI-172.02". Caltech. Retrieved January 11, 2013.
- Johnson, Michele; Harrington, J.D. (18 April 2013). "NASA's Kepler Discovers Its Smallest 'Habitable Zone' Planets to Date". NASA. Retrieved 18 April 2013.
- Overbye, Dennis (18 April 2013). "2 Good Places to Live, 1,200 Light-Years Away". The New York Times. Retrieved 4 February 2014.
- "NASA's Kepler Discovers Its Smallest 'Habitable Zone' Planets to Date". YouTube. 18 April 2013. Retrieved 19 April 2013.
- Johnson, Michele; Harrington, J.D. (26 February 2014). "NASA's Kepler Mission Announces a Planet Bonanza, 715 New Worlds". NASA. Retrieved 26 February 2014.
- Wall, Mike. "Population of Known Alien Planets Nearly Doubles as NASA Discovers 715 New Worlds". Retrieved 26 February 2014.
- "Kepler telescope bags huge haul of planets". Retrieved 27 February 2014.
- "Astronomy: Amateurs spot unusual exoplanet." Nature, vol. 515, no. 7526, 2014, p. 167. General OneFile, go.galegroup.com/ps/i.do?p=ITOF&sw=w&u=mcc_pv&v=2.1&id=GALE%7CA463819856&it=r&asid=19b4fb1a2b4dda6c006f610827d70020. Accessed 6 Feb. 2017.
- Meg (2014-10-30). "A New Paper and New Planet Discoveries". Planet Hunters. Retrieved 2017-02-06.
- Claven, Whitney (23 July 2014). "The Most Precise Measurement of an Alien World's Size". NASA. Retrieved 25 July 2014.
- Johnson, Michele (21 July 2014). "Astronomers Discover Transiting Exoplanet with Longest Known Year". NASA. Retrieved 25 July 2014.
- Harrington, J.D.; Villard, Ray (24 July 2014). "RELEASE 14-197 - Hubble Finds Three Surprisingly Dry Exoplanets". NASA. Retrieved 25 July 2014.
- Clavin, Whitney; Chou, Felicia; Johnson, Michele (6 January 2015). "NASA's Kepler Marks 1,000th Exoplanet Discovery, Uncovers More Small Worlds in Habitable Zones". NASA.
- Johnson, Michelle; Chou, Felicia (23 July 2015). "NASA's Kepler Mission Discovers Bigger, Older Cousin to Earth". NASA.
- "NASA's Spitzer Confirms Closest Rocky Exoplanet". 2015-07-30. Retrieved 2015-07-30.
- "PIA19832: Location of Nearest Rocky Exoplanet Known". NASA. 30 July 2015. Retrieved 30 July 2015.
- Chou, Felicia; Clavin, Whitney (30 July 2015). "NASA's Spitzer Confirms Closest Rocky Exoplanet". NASA. Retrieved 31 July 2015.
- Kaplan, Sarah (15 October 2015). "The strange star that has serious scientists talking about an alien megastructure". The Washington Post. ISSN 0190-8286. Retrieved 15 October 2015.
- Andersen, Ross (13 October 2015). "The Most Mysterious Star in Our Galaxy". The Atlantic. Retrieved 13 October 2015.
- Boyajian, T.S.; LaCourse, D.M.; Rappaport, S.A.; Fabrycky, D.; Fischer, D.A.; Gandolfi, D.; Kennedy, G.M.; Liu, M.C.; Moor, A.; Olah, K.; Vida, K.; Wyatt, M.C.; Best, W.M.J.; Ciesla, F.; Csak, B.; Dupuy, T.J.; Handler, G.; Heng, K.; Korhonen, H.; Kovacs, J.; Kozakis, T.; Kriskovics, L.; Schmitt, J.R.; Szabo, Gy.; Szabo, R.; Wang, J.; Goodman, S.; Hoekstra, A.; Jek, K.J. (14 September 2015). "Planet Hunters X. KIC 8462852- Where's the flux?". MNRAS. 457 (4): 3988. arXiv:1509.03622. Bibcode:2016MNRAS.457.3988B. doi:10.1093/mnras/stw218.
- "Found! Potentially Earth-Like Planet at Proxima Centauri Is Closest Ever". www.space.com. Retrieved 2017-03-24.
- "New earth-like exoplanets discovery 'best bet' for life". www.aljazeera.com. Retrieved 2017-02-23.
- "NASA Telescope Reveals Largest Batch of Earth-Size, Habitable-Zone Planets Around Single Star". Nasa.gov. NASA. 2017-02-22. Retrieved 23 February 2017.
- Bonfils, Xavier (2017). "A temperate exo-Earth around a quiet M dwarf at 3.4 parsecs". Astronomy and Astrophysics. 613: A25. arXiv:1711.06177. Bibcode:2018A&A...613A..25B. doi:10.1051/0004-6361/201731973.
- Mack, Eric (March 13, 2018). "A super-Earth around a red star could be wet and wild". CNET.
- Lozovschi, Alexandra (23 April 2018). "'Darker Than Coal': Researchers Find A 'Hot Jupiter' That Absorbs Nearly 99 Percent Of Light". Inquisitr.
- Georgiou, Aristos (3 May 2018). "Helium Discovered In Atmosphere Of Exoplanet For The First Time". Newsweek.
- "Discovery of a Sub-Saturn Exoplanet around a Sun-like star". ISRO. Retrieved 12 June 2018.
- "Exoplanet find that put India in select league - Times of India". The Times of India. Retrieved 12 June 2018.
|Wikimedia Commons has media related to Exoplanets.|