Astronomy:WASP-79b

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WASP-79b / Pollera
Artist impression of WASP-79b
Discovery
Discovered bySmalley et al.[1]
Discovery dateJune 1 2012[1]
Transit method[1]
Orbital characteristics[2]
0.05014+0.00034
−0.00035 astronomical unit|AU
Eccentricity0[1]
Orbital period3.66239094(60) days
Inclination85.52°±0.1°
StarWASP-79
Physical characteristics[2]
Mean radius1.5795±0.0048 RJ
Mass0.835±0.077 MJ
Physics1747±27 K


WASP-79b, also known as Pollera, is an extrasolar planet orbiting the star WASP-79 (Montuno). This planet is in the constellation Eridanus, and is about 810 light-years from Earth.

The name, Pollera, was selected in the NameExoWorlds campaign by Panama, during the 100th anniversary of the IAU. A pollera is the traditional costume the woman wears in the El Punto, a Panamanian dance.[3][4]

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.[3]

Characteristics

WASP-79b is a very large hot jupiter that is among the largest exoplanets discovered although its size is uncertain. The discovery paper estimated it to be 2.09 ± 0.14 |♃|J}}}}}} (approximately 300,000 kilometers across) with a temperature of 1,900 ± 50 K,[1] but modern studies suggest a lower radius of 1.5795±0.0048 RJ and a temperature of 1747±27 K.[2]

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°.[5]

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[6] and traces of Iron(I) hydride.[7][8] The presence of iron hydride was confirmed in 2021, along with tentative detection of vanadium oxide.[9] Also, in 2022 an atmospheric sodium has been detected.[10]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Smalley, B; Anderson, D. R; Collier-Cameron, A; Doyle, A. P; Fumel, A; Gillon, M; Hellier, C; Jehin, E et al. (2012). "WASP-78b and WASP-79b: Two highly-bloated hot Jupiter-mass exoplanets orbiting F-type stars in Eridanus". Astronomy & Astrophysics 547: A61. doi:10.1051/0004-6361/201219731. Bibcode: 2012A&A...547A..61S. 
  2. ↑ 2.0 2.1 2.2 Saha, Suman (2024-09-01). "Precise Transit Photometry Using TESS. II. Revisiting 28 Additional Transiting Systems with Updated Physical Properties". The Astrophysical Journal Supplement Series 274 (1): 13. doi:10.3847/1538-4365/ad6a60. ISSN 0067-0049. Bibcode: 2024ApJS..274...13S. 
  3. ↑ 3.0 3.1 "Approved names" (in en). http://www.nameexoworlds.iau.org/final-results. 
  4. ↑ "International Astronomical Union | IAU". https://www.iau.org/news/pressreleases/detail/iau1912/. 
  5. ↑ Brown, D. J. A.; Triaud, A. H. M. J.; Doyle, A. P.; Gillon, M.; Lendl, M.; Anderson, D. R.; Collier Cameron, A.; Hébrard, G. et al. (2016), "Rossiter–Mc Laughlin models and their effect on estimates of stellar rotation, illustrated using six WASP systems", Monthly Notices of the Royal Astronomical Society 464: 810–839, doi:10.1093/mnras/stw2316 
  6. ↑ Rathcke, Alexander D.; MacDonald, Ryan J.; Barstow, Joanna K.; Goyal, Jayesh M.; Lopez-Morales, Mercedes; Mendonça, João M.; Sanz-Forcada, Jorge; Henry, Gregory W. et al. (2021), "HST PanCET Program: A Complete Near-UV to Infrared Transmission Spectrum for the Hot Jupiter WASP-79b", The Astronomical Journal 162 (4): 138, doi:10.3847/1538-3881/ac0e99, Bibcode: 2021AJ....162..138R 
  7. ↑ Smalley, B.; Anderson, D. R.; Collier-Cameron, A.; Doyle, A. P.; Fumel, A.; Gillon, M.; Hellier, C.; Jehin, E. et al. (2019). "Transmission Spectroscopy of WASP-79b from 0.6 to 5.0 μm". The Astronomical Journal 159: 5. doi:10.3847/1538-3881/ab5442. 
  8. ↑ Skaf, Nour; Michelle Fabienne Bieger; Edwards, Billy; Changeat, Quentin; Morvan, Mario; Kiefer, Flavien; Blain, Doriann; Zingales, Tiziano et al. (2020). "ARES. II. Characterizing the Hot Jupiters WASP-127 b, WASP-79 b, and WASP-62b with the Hubble Space Telescope". The Astronomical Journal 160 (3): 109. doi:10.3847/1538-3881/ab94a3. Bibcode: 2020AJ....160..109S. 
  9. ↑ Foote, Trevor O.; Lewis, Nikole K.; Kilpatrick, Brian M.; Goyal, Jayesh M.; Bruno, Giovanni; Wakeford, Hannah R.; Robbins-Blanch, Nina; Kataria, Tiffany et al. (2022), "The Emission Spectrum of the Hot Jupiter WASP-79b from HST/WFC3", The Astronomical Journal 163 (1): 7, doi:10.3847/1538-3881/ac2f4a, Bibcode: 2022AJ....163....7F 
  10. ↑ Langeveld, Adam B.; Madhusudhan, Nikku; Cabot, Samuel H C. (2022), "A survey of sodium absorption in 10 giant exoplanets with high-resolution transmission spectroscopy", Monthly Notices of the Royal Astronomical Society 514 (4): 5192–5213, doi:10.1093/mnras/stac1539 



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