WASP-121

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WASP-121
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Puppis[1]
Right ascension 07h 10m 24.0595s[2]
Declination −39° 05′ 50.562″[2]
Apparent magnitude (V) 10.4
Characteristics
Spectral type F6V[3][4]
Apparent magnitude (B) 11.00[2]
Apparent magnitude (V) 10.51[2]
Apparent magnitude (J) 9.625[2]
Apparent magnitude (H) 9.439[2]
Apparent magnitude (K) 9.374[2]
Astrometry
Radial velocity (Rv)38.4±0.4 km/s
Proper motion (μ) RA: −3.735[5] mas/yr
Dec.: 25.663[5] mas/yr
Parallax (π)3.7996 ± 0.0104[5] mas
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
CD-38 3220, TYC 7630-352-1, Gaia DR2 5565050255701441664, 2MASS J07102406-3905506, 1SWASP J071024.05-390550.5, TOI-495[2]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

WASP-121, also known as CD-38 3220, is a magnitude 10.4 star located approximately 850 light-years away in the constellation Puppis.[1] WASP-121 has a mass and radius similar to the Sun's. Its planet WASP-121b orbits around WASP-121 in about 1.27 days.[3] WASP-121b is the first exoplanet found to contain water in an extrasolar planetary stratosphere (i.e., an atmospheric layer in which temperatures increase as the altitude increases).[7][8]

Planetary system[]

WASP-121b – computer-simulated views (August 2018)

In 2015, the extrasolar planet WASP-121b was discovered orbiting WASP-121 by the transit method.[3][9] WASP-121b is a "hot Jupiter" exoplanet with a mass about 1.18 times that of Jupiter and a radius about 1.81 times that of Jupiter.[4][7] The exoplanet orbits WASP-121, its host star, every 1.27 days.[4][7] Hot water molecules have been found in the stratosphere of WASP-121b.[3][7][8][10]

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

Gallery[]

An artist's impression of a hot Jupiter planet

See also[]

References[]

  1. ^ a b Staff. "Finding the constellation which contains given sky coordinates". djm.cc. Retrieved 3 August 2017.
  2. ^ a b c d e f g h "WASP-12". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 August 2017.
  3. ^ a b c d e f g h i j k l m Staff (2015). "Planet WASP-121 b". exoplanet.eu. Retrieved 3 August 2017.
  4. ^ a b c d e Staff (2017). "WASP Planets". wasp-planets.net. Retrieved 3 August 2017.
  5. ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  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. ^ a b c d Landau, Elizabeth; Villard, Ray (2 August 2017). "Hubble Detects Exoplanet with Glowing Water Atmosphere". NASA. Retrieved 2 August 2017.
  8. ^ a b 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.
  9. ^ 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
  10. ^ 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.

External links[]

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

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