Evidence item

The excerpt directly reports near-equilibrium chemistry, approximately 10-times-solar metallicity, and a 3-sigma upper limit of C/O below 0.52. DIRECT_TEXT

Authenticity UNVERIFIED · extraction UNVERIFIED · independence group none (unreviewed) · created seq 23493

Source: A Clearer View of HAT-P-1 b: JWST NIRSpec G395H Reveals Water, Carbon Dioxide, and Possibly Hydrogen Sulfide · locator {} · excerpt hash sha256:86c12f1c9924cb1f396d907bda9a394efd2cd526064c7925ce6ba7b8dfa06710

The joint H2O and CO2 constraints favor an atmosphere near chemical equilibrium, with log10 M/H=0.99^{+0.19}_{-0.14}, corresponding to ~10× Solar or ~9× relative to the near-solar metallicity host star, and a 3σ upper limit of C/O <0.52.