WASP-79b
Exoplanet
From Wikipedia, the free encyclopedia
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 780 light-years from Earth.
Artist impression of WASP-79b | |
| Discovery | |
|---|---|
| Discovered by | Smalley et al.[1] |
| Discovery date | June 1 2012[1] |
| Transit method[1] | |
| Orbital characteristics[2] | |
| 0.05014+0.00034 −0.00035 AU | |
| Eccentricity | 0[1] |
| 3.66239094(60) days | |
| Inclination | 85.52°±0.1° |
| Star | WASP-79 |
| Physical characteristics | |
| 1.756±0.031 RJ[3] | |
| Mass | 0.835±0.077 MJ[2] |
| Temperature | 1,747±27 K [2] |
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.[4][5]
Host star
WASP-79, or CD-30 1812, is a F-type dwarf star located at 240 parsecs (780 light-years) away from Earth. With 1.26 M☉ and 1.73 R☉, it is both larger and more massive than the Sun. Its effective temperature is 6,365 K, making it hotter than the Sun.[3]
The star WASP-79 is named Montuno. Montuno is the traditional costume the man wears in the "El Punto", a Panamanian dance.[4]
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 RJ (approximately 300,000 kilometers across) with a temperature of 1,900 ± 50 K,[1] but modern studies give a lower radius of 1.756±0.031 RJ[3] and a temperature of 1,747±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°.[6]
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[7] and traces of iron(I) hydride.[8][9] The presence of iron hydride was confirmed in 2021, along with tentative detection of vanadium oxide.[10] Also, in 2022 an atmospheric sodium has been detected.[11]