Intellectually Curious

Forecasting Alien Weather: Webb Reveals SIMP0136’s Self-Powered Auroras

Mike Breault
Join us as we decode James Webb's first weather forecast for SIMP J013656.5+093347, a rogue brown dwarf about 20 light-years away. Through time-series spectroscopy, Webb maps a three-layer atmosphere with silicate, iron, and rock clouds, and reveals that brightness changes come from deep, turbulent weather rather than patchy clouds. Most astonishing: a self-generated aurora heat engine drives the upper atmosphere to around 300°C, powered by a strong internal magnetic field with no star in sight. These findings help us understand weather on giant exoplanets and lay the groundwork for forecasting climates on worlds beyond our solar system.


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