WASP-39b

WASP-39b, officially named Bocaprins, is a "hot Jupiter" extrasolar planet discovered in February 2011[3] by the WASP project, notable for containing a substantial amount of water in its atmosphere.

[1] As part of the NameExoWorlds campaigns at the 100th anniversary of the IAU, the planet was named Bocaprins, after the beach Boca Prins [de; es] in the Arikok National Park of Aruba.

[6] The exoplanet orbits very close (7 million km) to WASP-39, its host star, every 4 days.

[8] High-fidelity spectra obtained by the James Webb Space Telescope in 2022 did not confirm a disequilibrium chemistry.

[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.

Comparison of " hot Jupiter " exoplanets, including WASP-39b (top row; 4th from left) (artist's concept).
From top left to lower right: WASP-12b , WASP-6b , WASP-31b , WASP-39b, HD 189733b , HAT-P-12b , WASP-17b , WASP-19b , HAT-P-1b and HD 209458b .
WASP-39b's atmospheric transmission spectrum captured by Webb’s Near-Infrared Spectrograph (NIRSpec) reveals first clear evidence for carbon dioxide in a planet outside the Solar System. [ 6 ]