Astronomy:WASP-121

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WASP-121, also known as CD-38 3220 and formally named Dilmun,[1] is a magnitude 10.4 star located approximately 858 light-years (263 parsecs) away in the constellation Puppis.[2] WASP-121 has a mass and radius similar to the Sun's. It hosts one known exoplanet.

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.[3]

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.[4] 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.[5]

Planetary system

In 2015, the exoplanet WASP-121b was discovered orbiting WASP-121 by the transit method.[6][7] 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.[8][9] The exoplanet orbits WASP-121, its host star, every 1.27 days.[8][9] 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).[6][9][10][11]

The WASP-121 planetary system[12]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b / Tylos 1.170±0.043 MJ 0.02571±0.00010 1.275[6] 0.0[6] 87.6[6]° 1.742±0.006 RJ
  • WASP-121b – computer-simulated views (August 2018)
    WASP-121b – computer-simulated views (August 2018)
  • An artist's impression of a hot Jupiter planet
    An artist's impression of a hot Jupiter planet

See also

References

  1. ↑ "2022 Approved Names" (in en). https://nameexoworlds.iau.org/2022approved-names. 
  2. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  3. ↑ Polanski, Alex S.; Crossfield, Ian J. M.; Howard, Andrew W.; Isaacson, Howard; Rice, Malena (2022), "Chemical Abundances for 25 JWST Exoplanet Host Stars with KeckSpec", Research Notes of the American Astronomical Society 6 (8): 155, doi:10.3847/2515-5172/ac8676, Bibcode: 2022RNAAS...6..155P 
  4. ↑ "List of ExoWorlds 2022". IAU. 8 August 2022. https://www.nameexoworlds.iau.org/2022exoworlds. 
  5. ↑ "2022 Approved Names". IAU. https://www.nameexoworlds.iau.org/2022approved-names. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Staff (2015). "Planet WASP-121 b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/wasp_121_b--2410/. Retrieved 3 August 2017. 
  7. ↑ Delrez, L.; Santerne, A.; Almenara, J.-M.; Anderson, D. R.; Collier-Cameron, A.; Díaz, R. F.; Gillon, M.; Hellier, C. et al. (2015), "WASP-121 b: A hot Jupiter close to tidal disruption transiting an active F star", Monthly Notices of the Royal Astronomical Society 458 (4): 4025–4043, doi:10.1093/mnras/stw522 
  8. ↑ 8.0 8.1 Staff (2017). "WASP Planets". wasp-planets.net. https://wasp-planets.net/wasp-planets/. 
  9. ↑ 9.0 9.1 9.2 Landau, Elizabeth; Villard, Ray (2 August 2017). "Hubble Detects Exoplanet with Glowing Water Atmosphere". NASA. https://www.jpl.nasa.gov/news/news.php?feature=6909. 
  10. ↑ Evans, Thomas M. (2 August 2017). "An ultrahot gas-giant exoplanet with a stratosphere". Nature 548 (7665): 58–61. doi:10.1038/nature23266. PMID 28770846. Bibcode: 2017Natur.548...58E. 
  11. ↑ Mikal-Evans, Thomas; Sing, David K.; Kataria, Tiffany; Wakeford, Hannah R.; Mayne, Nathan J.; Lewis, Nikole K.; Barstow, Joanna K.; Spake, Jessica J. (2020). "Confirmation of water emission in the dayside spectrum of the ultrahot Jupiter WASP-121b". Monthly Notices of the Royal Astronomical Society 496 (2): 1638–1644. doi:10.1093/mnras/staa1628. 
  12. ↑ Sing, David K.; Evans-Soma, Thomas M.; Rustamkulov, Zafar; Lothringer, Joshua D.; Mayne, Nathan J.; Schlaufman, Kevin C. (November 2024). "An Absolute Mass, Precise Age, and Hints of Planetary Winds for WASP-121A and b from a JWST NIRSpec Phase Curve" (in en). The Astronomical Journal 168 (6): 231. doi:10.3847/1538-3881/ad7fe7. ISSN 1538-3881. Bibcode: 2024AJ....168..231S. 

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Coordinates: Sky map 07h 10m 24.0s, −39° 05′ 51″



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