Feb 22, 2017  Exoplanet discoveries just keep coming. Earlier this month, astronomers announced that they had evidence of perhaps as many as 114 new exoplanets; the data they. Exoplanet Researchers Win a Nobel Prize! It's been an exciting week for exoplanet research, with two astronomers awarded the Nobel Prize in Physics for their 1995 discovery of 51 Pegasi b, the first planet observed to orbit a Sun-like star. We've compiled some resources on the original exoplanet.

Histogram of Exoplanets by size – the gold bars represent Kepler's latest newly verified exoplanets (February 26, 2014).An (extrasolar planet) is a located outside the. The first evidence of an exoplanet was noted as early as 1917, but was not recognized as such until 2016. No planet discovery has yet come from that evidence.

However, the of an exoplanet began in 1988. Afterwards, the first confirmed detection came in 1992, with the discovery of several terrestrial-mass planets orbiting the. The first confirmation of an exoplanet orbiting a star was made in 1995, when a giant planet was found in a four-day orbit around the nearby star. Some exoplanets have been by telescopes, but the vast majority have been detected through indirect methods, such as the and the. As of 2 April 2020, there are 4,241 confirmed in 3,139, with 691 systems. This is a list of the most notable discoveries.

Contents.1988–1994.: The radial velocity variations of the star were announced in 1989, consistent with a planet in a 2.5-year orbit. However, misclassification of the star as a 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.: 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, although subsequently it has been included in catalogues of extrasolar planets. It was found to be indeed a brown dwarf or red dwarf star (and not an exoplanet) in 2019.: 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 PSR B12–1998.: In 1995 this became the first exoplanet orbiting a main-sequence star to have its existence confirmed. It is a with a 4.2-day orbit.: 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.: In 1998, the first planet was found that orbits around a star.

It is closer to its star than is to the. More planets have subsequently been discovered even closer to the star.1999.: The first multiple-planetary system to be discovered around a star. It contains three planets, all of which are Jupiter-like. Planets, were announced in 1996, 1999, and 1999 respectively. Their masses are 0.687, 1.97, and 3.93 M J; they orbit at 0.0595, 0.830, and 2.54 AU respectively. In 2007 their inclinations were determined as non-coplanar.: 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.2001.: Astronomers using the announced that they had detected the atmosphere of HD 209458 b.

They found the spectroscopic signature of 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.: The first planet discovered around the giant star, an orange giant. This provides evidence for the survival and behavior of 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, alongside.2003.: 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, about 5,600 light years from Earth in the. This is one of only three planets known to orbit around a; one of the stars in the binary is a and the other is a. The planet has a mass twice that of Jupiter, and is estimated to be 12.7 billion years old.2004. Infrared image of 2M1207 (bluish) and 2M1207b (reddish). The two objects are separated by less than one in Earth's sky.

Image taken using the European Southern Observatory's 8.2 m Yepun Very Large Telescope.: In August, a planet orbiting with a mass of approximately 14 times that of the Earth was discovered with the 's. Depending on its composition, it is the first published 'hot Neptune' or 'super-Earth'.: The first planet found around a. The planet is also the first to be directly imaged (in ). 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 from the brown dwarf. The brown dwarf is only 25 times as massive as Jupiter.

The temperature of the 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 was found around 2M1207, providing evidence for active planet formation.2005. and: On March 22, two groups announced the first direct detection of light emitted by exoplanets, achieved with the. These studies permitted the direct study of the temperature and structure of the planetary atmospheres.: On June 13, a third planet orbiting the red dwarf star 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 with a period of 1.94 days.: 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.2006.: 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 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.: Has a planetary system with three -mass planets. Feed me oil music youtube. 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, and 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.2007.

and: 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, 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, 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.: A team of astronomers led by used the instrument on the European Southern Observatory's 3.6-meter telescope to discover this exoplanet by means of the 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 similar to, rendering the presence of liquid water impossible.

These studies suggest that the third planet in the system, is more likely to be habitable., a senior astronomer with the SETI institute, stated that two unsuccessful searches had already been made for radio signals from in the Gliese 581 system.: 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.: 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. It orbits its primary closely and is therefore quite hot, but stellar heating alone does not appear to explain its large size.2008. and: On February 14, the discovery of a planetary system was announced that is the most similar one known to the - pair within the Solar System in terms of mass ratio and orbital parameters. The presence of planets with such parameters has implications for possible in a solar system as Jupiter and Saturn have a stabilizing effect to the by sweeping away large from the habitable zone.: 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 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.: On June 16, announced a planetary system with three super-Earths orbiting this K-type star. The planets have masses ranging from 4 to 9 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 spectrograph in,.: 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.: On November 13, NASA and the Lawrence Livermore National Laboratory announced the discovery of an extrasolar planet orbiting just inside the of the A class star (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.: 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 and his team used the and in. 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 M J at 24 AU, 7 M J at 38 AU, and 5 M J at 68 AU.2009.: On February 3, the European Space Agency announced the discovery of a planet orbiting the star. 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 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 satellite.: 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. 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.

and: 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 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.: 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 composed of 75% water and 25% rock. Some of the water on this planet should be in the exotic form of.

This is the first planet discovered by, which is used to look for transits of super-Earth planets crossing the face of.2010.: 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.: 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).: 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.: 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 ’s Very Large Telescope and its powerful 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.: 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.2011.: On February 3, astronomers using NASA's 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.: 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'.2012.: On 16 October 2012, the discovery was announced of an Earth-mass planet in orbit around Alpha Centauri B. The discovery was on the 17 of October, in the scientific journal, and the lead author of the paper was, a graduate student at the. 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.2013.: On 3 January 2013, the discovery of a 'Jupiter-size' that could 'potentially be habitable' was announced. The exoplanet was discovered by amateur astronomers from the project of using data from the and confirmed, with 99.9 percent confidence, by observations at the in. PH2 b is the second confirmed planet discovered by (the first being ). (formerly KOI-172.02): On 7 January 2013, the discovery of an unconfirmed candidate was announced by astronomers affiliated with the.

The candidate object, a, has a radius 1.54 times that of. Kepler-69c orbits a sun-like, named Kepler-69, within the ' a zone where could exist on the surface of the. Scientists claim the exoplanet, if confirmed, could be a 'prime candidate to host '.

On 18 April 2013, announced the discovery of three new -like –, and (now confirmed) – in the of their respective host stars,. The new exoplanets, which are considered prime candidates for possessing liquid water and thus potentially life, were identified using the.2014. On 26 February 2014, NASA announced the discovery of 715 newly verified around 305 by the. The exoplanets were found using a statistical technique called 'verification by multiplicity'. 95% of the discovered exoplanets were smaller than and four, including Kepler-296f, were less than 2 1/2 the size of and were in where surface temperatures are suitable for liquid.

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 ; the discovery of an exoplanet that has the longest known year (704 days) of any found so far; and, finding very dry on three exoplanets (, ) orbiting sun-like stars.2015. 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 of their host: two of the three, and, are near-Earth-size and likely rocky; the third, is a. Similar confirmed small exoplanets in habitable zones found earlier by Kepler include:, and. 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, 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. 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/cm 3, confirming that it is a rocky planet.

In September 2015, astronomers reported the unusual light fluctuations of, an in the, as detected by the, while searching for. Various explanations have been presented, including those based on, as well as, an.2016. On August 24, 2016, the Pale Red Dot campaign announced the discovery of. Orbiting the closest star to the solar system, the 1.3 Earth-mass exoplanet orbits within the star's habitable zone. The planet was discovered by the and instruments on telescopes at the European Southern Observatory in Chile, after signs of a planet orbiting Proxima Centauri were first found in 2013.2017.

On 22 February 2017, several scientists working at the for NASA, using the Spitzer Space Telescope, announced the discovery of seven potentially habitable exoplanets orbiting, 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. is a confirmed Earth-sized exoplanet, likely rocky, orbiting within the inner of the. It is the second-closest potentially found, at a distance of about 11 light-years; only is closer.

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