Using the James Webb Space Telescope, astronomers have detected hydrogen sulfide (H2S) in the atmospheres of four massive, Jupiter-like planets orbiting HR 8799 — the first identification of H2S beyond the Solar System. The finding indicates sulfur was delivered by solids during formation, resolving a planet vs. brown dwarf debate.
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Briefing
First robust detection of hydrogen sulfide (H2S) in exoplanet atmospheres — measured on four HR 8799 planets — provides a direct chemical fingerprint that requires sulfur delivery via solids, not nebular gas, and settles a long-standing classification dispute.
Changes constraints on giant-planet formation and atmospheric chemistry models and highlights JWST's transformative spectroscopic capabilities, building on its recent molecular discoveries in a nearby galaxy and volatile detections from an interstellar comet.
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