| Discovery | |
|---|---|
| Discovered by | Smalley et al. |
| Discovery date | June 1 2012 |
| Detection method | Transit method |
| Orbital characteristics | |
| Semi-major axis | 0.0535±0.0008 AU |
| Eccentricity | 0 |
| Orbital period (sidereal) | 3.662366±0.0000085 d |
| Inclination | 83.3±0.5° |
| Star | WASP-79 |
| Physical characteristics | |
| Mean radius | 2.09±0.14 RJ |
| Mass | 0.90±0.08 MJ |
| Temperature | 1900±50 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.
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.
The star WASP-79 is named Montuno. Montuno is the traditional costume the man wears in the “El Punto”, a Panamanian dance.
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.
The planet is orbiting the host star at nearly-polar orbit with respect to star's equatorial plane, inclination being equal to −95.2
−1.0°.
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 and traces of Iron(I) hydride. The presence of iron hydride was confirmed in 2021, along with tentative detection of vanadium oxide. Also, in 2022 an atmospheric sodium has been detected.
See also
References
- ^ 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.
- ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
- "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
- 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
- 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
- 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.
- 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.
- 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
- 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
