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WASP-121
Star in the constellation Puppis From Wikipedia, the free encyclopedia
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WASP-121, also known as CD-38 3220 and formally named Dilmun,[8] is a magnitude 10.4 star located approximately 858 light-years (263 parsecs) away in the constellation Puppis.[1] WASP-121 has a mass and radius similar to the Sun's. It hosts one known exoplanet.
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The star, although metal-rich in terms of overall contents of heavy elements, is depleted of carbon. The carbon to oxygen molar ratio of 0.23±0.05 for WASP-121 is well below the solar ratio of 0.55.[9]
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Nomenclature
The designation WASP-121 indicates that this was the 121st star found to have a planet by the Wide Angle Search for Planets.
In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[10] The approved names, proposed by a team from Bahrain, were announced in June 2023. WASP-121 is named Dilmun after the ancient civilization, and its planet is named Tylos after the ancient Greek name for Bahrain.[11]
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Planetary system
In 2015, the exoplanet WASP-121b was discovered orbiting WASP-121 by the transit method.[3][12] WASP-121b is a hot Jupiter with a mass about 1.18 times that of Jupiter and a radius about 1.81 times that of Jupiter.[4][13] The exoplanet orbits WASP-121, its host star, every 1.27 days.[4][13] Hot water molecules have been found in the stratosphere of WASP-121b (i.e., the atmospheric layer in which temperatures increase as the altitude increases).[3][13][14][15]
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Gallery
WASP-121b – computer-simulated views (August 2018)
An artist's impression of a hot Jupiter planet
See also
References
External links
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