 | This article needs to beupdated. The reason given is: New discovery on the physyical contrast between the dayside and nightside of the planet, as in the source "https://science.nasa.gov/missions/webb/nasas-webb-investigates-eternal-sunrises-sunsets-on-distant-world/". Please help update this article to reflect recent events or newly available information.(October 2024) |
.jpg) Exoplanet WASP-39b artist's concept[1] | |
| Discovery | |
|---|---|
| Discovery site | WASP[2] |
| Discovery date | 2011[2] |
| Primary transit[2] | |
| Orbital characteristics | |
| 0.0486±0.0005AU,(7.27±0.1)×106 km | |
| Eccentricity | 0[2] |
| 4.05526[2]d | |
| Inclination | 87.83±0.25[2] |
| Star | WASP-39[2] |
| Physical characteristics | |
| 1.27±0.04[2]RJ (91000±3000 km) | |
| Mass | 0.28±0.03[2]MJ |
Meandensity | 0.180 ± 0.040 g/cm3[citation needed] |
WASP-39b, officially namedBocaprins, is a "hot Jupiter"extrasolar planet discovered in February 2011[3] by theWASP project, notable for containing a substantial amount of water in itsatmosphere.[1][4][5] In addition WASP-39b was the first exoplanet found to containcarbon dioxide in its atmosphere,[6][7] and likewise forsulfur dioxide.
WASP-39b is in theconstellation Virgo, and is about 700light-years fromEarth.[1] As part of theNameExoWorlds campaigns at the 100th anniversary of theIAU, the planet was named Bocaprins, after the beachBoca Prins [de;es] in theArikok National Park ofAruba.
WASP-39b has a mass of about 0.28 times that ofJupiter and a radius about 1.27 times that of Jupiter (91,000 km).[2] It is a hot gas giant planet with a high temperature of 900°C.[6] Theexoplanet orbits very close (7 million km) toWASP-39, its host star, every 4 days.[1]
WASP-39b is also notable for having an extremely low density, near that ofWASP-17b. While WASP-17b has a density of0.13±0.06 g/cm3, WASP-39b has a slightly higher density of0.18±0.04 g/cm3.
.png)
Hot water molecules were found in theatmosphere of WASP-39b in a 2018 study.[1] The atmospheric transmission spectra, taken by different instruments, were inconsistent as in 2021, possibly indicating a disequilibrium atmospheric chemistry.[8] High-fidelity spectra obtained by theJames Webb Space Telescope in 2022 did not confirm a disequilibrium chemistry.
WASP-39b is one of theJames Webb Space Telescope's early release science targets.Sulfur dioxide was observed in this planet's atmosphere for the first time, or indeed of any planet outside of theSolar System, indicating the existence ofphotochemical processes in the atmosphere.[9] WASP-39b is the first exoplanet in whichcarbon dioxide has been detected.[6][10][7]
Planetary transmission spectra taken in 2022 has indicated the atmosphere of WASP-39b is partially cloudy, and planet C/O ratio appears to be subsolar.[11] The spectral signature of water,carbon dioxide,sodium[12] andsulfur dioxide were also detected.[13]
| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Virgo |
| Right ascension | 14h 29m 18.4151689656s |
| Declination | −03° 26′ 40.204480380″ |
| Apparent magnitude (V) | 12.09 |
| Distance | 702 ± 2 ly (215.4 ± 0.7 pc) |
| Other designations | |
| 2MASS J14291840-0326403, Gaia DR2 3643098875168270592, Gaia EDR3 3643098875168270592 | |
| Database references | |
| SIMBAD | data |
The parent starWASP-39 is ofspectral class G and is slightly smaller than the Sun. It lies in theVirgo constellation, 698light-years fromEarth.[1] The star WASP-39 was formally named Malmok in 2019.[14][15]
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Media related toWASP-39b at Wikimedia Commons
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