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Research dossier · version 1 · updated Oct 30, 2026

Exoplanets & Biosignatures: State of the Field (October 2026)

This dossier maps exoplanet biosignature science as of October 2026: JWST atmosphere results for giant and rocky planets, the disputed dimethyl sulfide claim for the sub-Neptune K2-18 b, and the stellar-contamination and model-degeneracy problems that limit rocky-planet tests. The main takeaway is that no biosignature gas has been confirmed and the leading claims remain contested.

4,114 words54 sources29 evidence-mapped claims12 benchmarks18 timeline events✓ citation-verified Oct 30, 2026

AI-assisted synthesis of the cited literature, independently fact-checked against its sources; not peer reviewed.

Contents

  1. Executive summary
  2. Background and core concepts
  3. Timeline of key milestones
  4. State of the art
  5. Giant and warm planets: photochemistry, clouds and haze
  6. Temperate sub-Neptunes: the K2-18 b test case
  7. Rocky planets around M dwarfs
  8. Stellar contamination and retrieval methods
  9. Biosignature theory and false positives
  10. Quantitative benchmarks
  11. Open problems and active debates
  12. Major programs and players
  13. Outlook: what to watch (next 12-18 months)
  14. Key papers
  15. Glossary

Sample findings

  • JWST transmission spectra of WASP-39b show an absorption feature at 4.05 μm attributed to photochemically produced SO2.
  • Thermochemical equilibrium predicts SO2 below 1 ppb in WASP-39b, while photochemistry of H2O and H2S yields 1–10 ppm.
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