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Using NIRSpec/G395H alone, we can place limits on the atmospheric metallicity of ≳350× Solar when the opaque pressure level is greater than 0.01 bars."},{"attestation":"unclaimed","claim_id":"C2","kind":"weakest_assumption","source":"verdict.weakest_assumption","status":"machine_extracted","text":"The assumption that grey opaque clouds and chemical equilibrium accurately represent all plausible atmospheres on this planet, such that a non-detection truly rules out lower metallicities rather than reflecting model incompleteness or unaccounted systematics in the single-visit data."},{"attestation":"unclaimed","claim_id":"C3","kind":"one_line_summary","source":"verdict.one_line_summary","status":"machine_extracted","text":"JWST NIRSpec observations of LTT 1445 A b yield a featureless 3-5μm transmission spectrum, limiting atmospheric metallicity to ≳350× solar under grey-cloud models."},{"attestation":"unclaimed","claim_id":"C4","kind":"headline","source":"verdict.pith_extraction.headline","status":"machine_extracted","text":"The JWST 3-5 micron transmission spectrum of LTT 1445 A b shows no detectable atmospheric features, limiting metallicity to at least 350 times solar under grey cloud models."}],"snapshot_sha256":"74d2208eb4dad725f7d7a1bf7e18d441af331319ae93ef3f2ea3b220395b12b9"},"formal_canon":{"evidence_count":1,"snapshot_sha256":"521783d1a6cc5bf6692ab3cc33bbb1c97caa3ee3ec46a402033cdaf62773c584"},"paper":{"abstract_excerpt":"The search for an atmosphere on the closest rocky M dwarf planet, LTT 1445 A b, has been the subject of intense investigation from both the ground and space. 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