Saturn-like planet enriched with atmospheric metals.

The Saturn-mass exoplanet HD 149026b has an atmospheric metallicity 59-276 times solar, making it the most metal-rich giant planet known. The result is based on modeling CO2 and H2O absorption features in the thermal emission spectrum of the planet measured by JWST. The atmospheric metallicities of both HD 149026b and the solar system giant planets are more correlated with bulk metallicity than planet mass.