Astronomers find new clues about the formation of metal-raining exoplanet WASP-121b

space.com February 3, 2025, 10:00 PM UTC

Astronomers studying the exoplanet WASP-121b have found it may have formed closer to its star than previously thought. This challenges existing theories about how "roasting marshmallow" planets, which rain liquid metal, develop. Using the Gemini South telescope, researchers measured the rock-to-ice ratio of WASP-121b's atmosphere. Their findings suggest the planet formed in a hotter region of its protoplanetary disk, contrary to the belief that gas giants need solid ices to form. The study indicates that current models of planet formation may need revision. The team plans to investigate other ultra-hot Jupiters using upgraded instruments to better understand these unique exoplanets.


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