JWST Just Broke 30 Years of Atmospheric Models. Here's What It Saw.

JWST directly imaged Epsilon Indi Ab — a gas giant 7.6× the mass of Jupiter, just 12 light-years from Earth.

For 30 years, atmospheric models said this kind of cool gas giant should be ammonia-dominated. JWST saw the ammonia signal — but way weaker than predicted. The best explanation? Thick water-ice clouds suppressing the signal from below.

Published this week in ApJ Letters by Max Planck Institute. The strongest evidence yet for water-ice clouds on a directly imaged exoplanet.

Source paper: https://arxiv.org/abs/2603.08780 (Matthews et al., MPIA Heidelberg)

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