WASP-79b

WASP-79b, also known as Pollera, 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.

WASP-79b / Pollera
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

    The planet WASP-79b is named Pollera. The name 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.[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] Also, in 2022 an atmospheric sodium has been detected.[9]

    See also

    References
    1. 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. S2CID 119233646.
    2. "Approved names". NameExoworlds. Retrieved 2020-01-02.
    3. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
    4. Brown, D. J. A.; Triaud, A. H. M. J.; Doyle, A. P.; Gillon, M.; Lendl, M.; Anderson, D. R.; Collier Cameron, A.; Hébrard, G.; Hellier, C.; Lovis, C.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Smalley, B. (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, arXiv:1610.00600, doi:10.1093/mnras/stw2316
    5. Rathcke, Alexander D.; MacDonald, Ryan J.; Barstow, Joanna K.; Goyal, Jayesh M.; Lopez-Morales, Mercedes; Mendonça, João M.; Sanz-Forcada, Jorge; Henry, Gregory W.; Sing, David K.; Alam, Munazza K.; Lewis, Nikole K.; Chubb, Katy L.; Taylor, Jake; Nikolov, Nikolay; Buchhave, Lars A. (2021), "HST PanCET Program: A Complete Near-UV to Infrared Transmission Spectrum for the Hot Jupiter WASP-79b", The Astronomical Journal, 162 (4): 138, arXiv:2104.10688, Bibcode:2021AJ....162..138R, doi:10.3847/1538-3881/ac0e99, S2CID 233347193
    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. S2CID 207880528.
    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. Characterizing the Hot Jupiters WASP-127 b, WASP-79 b, and WASP-62b with the Hubble Space Telescope". The Astronomical Journal. 160 (3): 109. arXiv:2005.09615. Bibcode:2020AJ....160..109S. doi:10.3847/1538-3881/ab94a3. S2CID 218684714.
    8. Foote, Trevor O.; Lewis, Nikole K.; Kilpatrick, Brian M.; Goyal, Jayesh M.; Bruno, Giovanni; Wakeford, Hannah R.; Robbins-Blanch, Nina; Kataria, Tiffany; MacDonald, Ryan J.; López-Morales, Mercedes; Sing, David K.; Mikal-Evans, Thomas; Bourrier, Vincent; Henry, Gregory; Buchhave, Lars A. (2022), "The Emission Spectrum of the Hot Jupiter WASP-79b from HST/WFC3", The Astronomical Journal, 163 (1): 7, arXiv:2107.14334, Bibcode:2022AJ....163....7F, doi:10.3847/1538-3881/ac2f4a, S2CID 236635028
    9. 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, arXiv:2205.01623, doi:10.1093/mnras/stac1539
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