WASP-121 / Dilmun
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Puppis[1]
Right ascension 07h 10m 24.06046s[2]
Declination −39° 05′ 50.5712″[2]
Apparent magnitude (V) 10.4
Characteristics
Spectral type F6V[3][4]
Apparent magnitude (B) 11.00[5]
Apparent magnitude (V) 10.51[5]
Apparent magnitude (J) 9.625[5]
Apparent magnitude (H) 9.439[5]
Apparent magnitude (K) 9.374[5]
Astrometry
Radial velocity (Rv)38.25±0.22[2] km/s
Proper motion (μ) RA: −3.735 mas/yr[2]
Dec.: 25.663 mas/yr[2]
Parallax (π)3.7996 ± 0.0104 mas[2]
Distance858 ± 2 ly
(263.2 ± 0.7 pc)
Details
Mass1.353[3] M☉
Radius1.458[3] R☉
Temperature6,460.0[3] K
Metallicity [Fe/H]0.13[3] dex
Rotational velocity (v sin i)11.90±0.31[6] km/s
Other designations
Dilmun, CD−38 3220, TOI-495, WASP-121, TYC 7630-352-1, 2MASS J07102406-3905506[5]
Database references
SIMBADdata

WASP-121, also known as CD-38 3220, 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.

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.[7]

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.[8] 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.[9]

Planetary system

In 2015, the exoplanet WASP-121b was discovered orbiting WASP-121 by the transit method.[3][10] 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][11] The exoplanet orbits WASP-121, its host star, every 1.27 days.[4][11] 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][11][12][13]

The WASP-121 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Tylos 1.184[3][4] MJ 0.02544[3] 1.275[3] 0.0[3] 87.6[3]° 1.81[4] RJ

See also

References

  1. 1 2 Staff. "Finding the constellation which contains given sky coordinates". djm.cc. Retrieved 3 August 2017.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 5 6 7 8 9 10 11 12 Staff (2015). "Planet WASP-121 b". Extrasolar Planets Encyclopaedia. Retrieved 3 August 2017.
  4. 1 2 3 4 5 Staff (2017). "WASP Planets". wasp-planets.net. Retrieved 3 August 2017.
  5. 1 2 3 4 5 6 "WASP-121". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 August 2017.
  6. ↑ Borsa, F.; Allart, R.; Casasayas-Barris, N.; Tabernero, H.; Zapatero Osorio, M. R.; Cristiani, S.; Pepe, F.; Rebolo, R.; Santos, N. C.; Adibekyan, V.; Bourrier, V.; Demangeon, O. D. S.; Ehrenreich, D.; Pallé, E.; Sousa, S.; Lillo-Box, J.; Lovis, C.; Micela, G.; Oshagh, M.; Poretti, E.; Sozzetti, A.; Allende Prieto, C.; Alibert, Y.; Amate, M.; Benz, W.; Bouchy, F.; Cabral, A.; Dekker, H.; D'Odorico, V.; et al. (2021), "Atmospheric Rossiter–Mc Laughlin effect and transmission spectroscopy of WASP-121b with ESPRESSO", Astronomy & Astrophysics, 645: A24, arXiv:2011.01245, Bibcode:2021A&A...645A..24B, doi:10.1051/0004-6361/202039344, S2CID 226237425
  7. ↑ 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, arXiv:2207.13662
  8. ↑ "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.
  9. ↑ "2022 Approved Names". nameexoworlds.iau.org. IAU. Retrieved 7 June 2023.
  10. ↑ Delrez, L.; Santerne, A.; Almenara, J.-M.; Anderson, D. R.; Collier-Cameron, A.; Díaz, R. F.; Gillon, M.; Hellier, C.; Jehin, E.; Lendl, M.; Maxted, P. F. L.; Neveu-Vanmalle, M.; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Smalley, B.; Smith, A. M. S.; Triaud, A. H. M. J.; Udry, S.; Van Grootel, V.; West, R. G. (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, arXiv:1506.02471, doi:10.1093/mnras/stw522
  11. 1 2 3 Landau, Elizabeth; Villard, Ray (2 August 2017). "Hubble Detects Exoplanet with Glowing Water Atmosphere". NASA. Retrieved 2 August 2017.
  12. ↑ Evans, Thomas M.; et al. (2 August 2017). "An ultrahot gas-giant exoplanet with a stratosphere". Nature. 548 (7665): 58–61. arXiv:1708.01076. Bibcode:2017Natur.548...58E. doi:10.1038/nature23266. PMID 28770846. S2CID 205258293.
  13. ↑ 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. arXiv:2005.09631. doi:10.1093/mnras/staa1628. S2CID 218684532.
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