JWST Finds Extreme Haze on Kepler-51d

Astronomers using the James Webb Space Telescope have discovered that the "super-puff" exoplanet Kepler-51d is enveloped in the thickest haze ever detected, rendering its atmospheric composition an impenetrable mystery. This Saturn-sized, cotton-candy-like world, with a density challenging existing formation models, remains an enigma even for JWST, prompting further investigation into its origins.

Astronomers utilizing the James Webb Space Telescope (JWST) have discovered that the exoplanet Kepler-51d, a "super-puff" world, is enveloped in an unusually thick haze, making its atmospheric composition impossible to determine.
This extreme haze is believed to be the thickest ever detected on any planet, significantly obscuring details that would normally provide a "fingerprint" of its atmosphere, as reported by Sci.News.
The planet's remarkably low density and close orbit to its star challenge existing models of how gas giants form and survive, leaving scientists with more questions about its origins.
According to Penn State researchers, Kepler-51d is characterized by a density akin to "cotton candy" due to its tiny core and vast atmosphere, despite being similar in size to Saturn.
Suvrath Mahadevan, a Penn State astronomer and study co-author, noted that the haze is "almost the radius of Earth" and is similar to Titan's haze but on a much larger scale, as stated in ScienceDaily.
The findings, published in The Astronomical Journal, highlight that even JWST's advanced capabilities could not penetrate the haze, prompting further investigation into other planets within the Kepler-51 system.