Published result
LHS 1140 b
NIRISS + NIRSpec
A hydrogen-rich H₂ atmosphere was ruled out; a heavy atmosphere remains possible. The 2026 helium evidence came from ground-based telescopes.
Webb and atmospheres
Observing is not detecting. Detecting is not explaining.
James Webb status is split into approved program, observation, public data, archived spectrum, paper and contested result.
Automated sourceNExoList + spectra
The catalog reads approved JWST observation and archived-spectrum counts from NASA Exoplanet Archive.
Files and criteria →Editorial snapshot
The targets shaping the current search
The catalog’s automated counts come from PSCompPars/NExoList. This panel adds scientific context to the most important cases.
Published result
TRAPPIST-1 e
NIRSpec/PRISM
A primary H₂-rich atmosphere was ruled out; a secondary atmosphere remains unconfirmed. The star dominates the error budget.
Contested result
K2-18 b
NIRISS + NIRSpec + MIRI
CH₄ and CO₂ are robust; DMS/DMDS depend on the reduction and model. No biosignature has been confirmed.
Program in progress
LP 890-9 c
NIRSpec/PRISM · 18 transits
The Cosmic Shoreline campaign has been approved to search for atmospheric retention; results have not yet been published.
Photometry, not atmosphere
TOI-700 d / e
JWST
The system was observed to refine ephemerides and search for exomoons; this is not atmospheric characterization.