WASP-79b

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WASP-79b
Discovery
Discovered bySmalley et al.[1]
Discovery dateJune 1 2012[1]
Transit method[1]
Orbital characteristics
0.0535±0.0008 AU
Eccentricity0[1]
3.662366±0.0000085[1] d
Inclination83.3±0.5°[1]
StarWASP-79
Physical characteristics
Mean radius
2.09±0.14[1] RJ
Mass0.90±0.08[1] MJ
Temperature1900±50[1] K

WASP-79b is an extrasolar planet orbiting the star CD-30 1812. This planet is in the constellation Eridanus, and is about 810 light-years from Earth.

The planet WASP-79b is named Pollera. The name was selected in the NameExoWorlds campaign by Panama, during the 100th anniversary of the IAU. Pollera is the traditional costume the woman wears in the El Punto, a Panamanian dance.[2][3]

Host star[]

WASP-79, or CD-30 1812, is a F-type dwarf star located at 240 parsecs (810 light years) away from Earth. With 1.38 M☉ and 1.53 R☉, it is both larger and more massive than the Sun. Its effective temperature is 6,600 K, making it hotter than the Sun.[1]

The star WASP-79 is named Montuno. Montuno is the traditional costume the man wears in the “El Punto”, a Panamanian dance.[2]

Characteristics[]

WASP-79b is a very large hot jupiter that is among the largest exoplanets discovered although its size is uncertain. It is most likely to be larger at 2.09 ± 0.14 RJ (approximately 300,000 kilometers across) with a temperature of 1,900 ± 50 K. However, it could be as small as 1.7 ± 0.11 RJ (approximately 240,000 kilometers across), which is comparable to the size of another hot jupiter WASP-78b, with a temperature at 1,770 ± 50 K. Despite being larger than Jupiter, it is slightly less massive.[1]

The planet is orbiting the host star at nearly-polar orbit with respect to star's equatorial plane, inclination being equal to −95.2+0.9
−1.0°.[4]

In 2019 and 2020, the transmission spectra of WASP-79b were taken utilizing HST and Spitzer Space Telescope, with best fit being the hazy atmosphere containing about 1% water[5] and traces of Iron(I) hydride.[6] [7] The presence of iron hydride was confirmed in 2021, along with tentative detection of vanadium oxide.[8]

See also[]

References[]

  1. ^ a b c d e f g h i j k Smalley, B; Anderson, D. R; Collier-Cameron, A; Doyle, A. P; Fumel, A; Gillon, M; Hellier, C; Jehin, E; Lendl, M; Maxted, P. F. L; Pepe, F; Pollacco, D; Queloz, D; Ségransan, D; Smith, A. M. S; Southworth, J; Triaud, A. H. M. J; Udry, S; West, R. G (2012). "WASP-78b and WASP-79b: Two highly-bloated hot Jupiter-mass exoplanets orbiting F-type stars in Eridanus". Astronomy & Astrophysics. 547: A61. arXiv:1206.1177. Bibcode:2012A&A...547A..61S. doi:10.1051/0004-6361/201219731.
  2. ^ a b "Approved names". NameExoworlds. Retrieved 2020-01-02.
  3. ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  4. ^ Rossiter–McLaughlin models and their effect on estimates of stellar rotation, illustrated using six WASP systems, 2016, arXiv:1610.00600
  5. ^ HST PanCET Program: A Complete Near-UV to Infrared Transmission Spectrum for the Hot Jupiter WASP-79b, 2021, arXiv:2104.10688
  6. ^ Smalley, B.; Anderson, D. R.; Collier-Cameron, A.; Doyle, A. P.; Fumel, A.; Gillon, M.; Hellier, C.; Jehin, E.; Lendl, M.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Segransan, D.; Smith, A. M. S.; Southworth, J.; Triaud, A. H. M. J.; Udry, S.; West, R. G.; Rathcke, Alexander D.; Sanz-Forcada, Jorge (2019). "Transmission Spectroscopy of WASP-79b from 0.6 to 5.0 μm". The Astronomical Journal. 159: 5. arXiv:1911.02051. doi:10.3847/1538-3881/ab5442.
  7. ^ Skaf, Nour; Michelle Fabienne Bieger; Edwards, Billy; Changeat, Quentin; Morvan, Mario; Kiefer, Flavien; Blain, Doriann; Zingales, Tiziano; Poveda, Mathilde; Al-Refaie, Ahmed; Baeyens, Robin; Gressier, Amelie; Guilluy, Gloria; Adam Yassin Jaziri; Modirrousta-Galian, Darius; Mugnai, Lorenzo V.; Pluriel, William; Whiteford, Niall; Wright, Sam; Kai Hou Yip; Charnay, Benjamin; Leconte, Jeremy; Drossart, Pierre; Tsiaras, Angelos; Venot, Olivia; Waldmann, Ingo; Beaulieu, Jean-Philippe (2020). "ARES II: Characterising the Hot Jupiters WASP-127 b, WASP-79 b and WASP-62 b with HST". arXiv:2005.09615 [astro-ph.EP].
  8. ^ The Emission Spectrum of the Hot Jupiter WASP-79b from HST/WFC3, 2021, arXiv:2107.14334
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