{"paper":{"title":"The First Remotely Detected Biosignature May Not Be the Most Common: Implications for JWST and HWO","license":"http://creativecommons.org/licenses/by/4.0/","headline":"The first remotely detected biosignature is likely to come from a detectability-favored outlier rather than a typical Earth analog.","cross_cats":["astro-ph.GA","astro-ph.IM","astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"Ravi Kopparapu","submitted_at":"2026-05-15T22:26:19Z","abstract_excerpt":"The first detected member of a new astronomical class is often not representative of the underlying population, but instead reflects the selection effects of the observing technique that found it. We apply this idea to the first remote detection of biosignatures with two leading near future strategies: JWST transmission spectroscopy and HWO reflected light direct imaging. Using the known signal scalings of the two methods together with a simple detectability model, we show how a rare but observationally favored planet class can dominate early detections even when it is intrinsically uncommon. "},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"a rare but observationally favored planet class can dominate early detections even when it is intrinsically uncommon. For JWST, an early biosignature detection is most likely to arise from a detectability favored outlier, such as a sub-Neptune or other atmosphere rich planet around a nearby M dwarf, rather than from a true Earth analog.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The simple detectability model combined with known signal scalings is sufficient to determine which planet classes will dominate early detections; this enters in the abstract's description of applying signal scalings and a detectability model to compare JWST and HWO strategies.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Selection effects in JWST transmission spectroscopy and HWO reflected-light imaging may cause the first biosignature detection to arise from an atypical planet rather than a representative Earth analog.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"The first remotely detected biosignature is likely to come from a detectability-favored outlier rather than a typical Earth analog.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"2b3090d36ad19e5a3b53b68ecc991c32164a73b531f7bb30ea2732d85c1b8524"},"source":{"id":"2605.16674","kind":"arxiv","version":1},"verdict":{"id":"415f74c9-8579-46a2-8f17-4b6745c85e59","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-19T20:24:00.497655Z","strongest_claim":"a rare but observationally favored planet class can dominate early detections even when it is intrinsically uncommon. For JWST, an early biosignature detection is most likely to arise from a detectability favored outlier, such as a sub-Neptune or other atmosphere rich planet around a nearby M dwarf, rather than from a true Earth analog.","one_line_summary":"Selection effects in JWST transmission spectroscopy and HWO reflected-light imaging may cause the first biosignature detection to arise from an atypical planet rather than a representative Earth analog.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The simple detectability model combined with known signal scalings is sufficient to determine which planet classes will dominate early detections; this enters in the abstract's description of applying signal scalings and a detectability model to compare JWST and HWO strategies.","pith_extraction_headline":"The first remotely detected biosignature is likely to come from a detectability-favored outlier rather than a typical Earth analog."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.16674/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"doi_compliance","ran_at":"2026-05-19T20:32:32.870844Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_title_agreement","ran_at":"2026-05-19T20:31:19.220263Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"claim_evidence","ran_at":"2026-05-19T19:01:56.387878Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"ai_meta_artifact","ran_at":"2026-05-19T18:33:26.506647Z","status":"skipped","version":"1.0.0","findings_count":0}],"snapshot_sha256":"8ef94eeb9f8242d905b7ef3fece4ef5a4ce9e29de5f03c577f2609846e1dec22"},"references":{"count":37,"sample":[{"doi":"","year":2016,"title":"Arney, G., Domagal-Goldman, S. D., Meadows, V. S., et al. 2016, Astrobiology, 16, 873","work_id":"a36751d8-d8e8-4145-9b1b-4b83ff7f4853","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2019,"title":"Arney, G. N. 2019, The Astrophysical Journal Letters, 873, L7","work_id":"1e9f9092-e5fd-43d5-8eaf-df762c1ff2a4","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2019,"title":"2019, The Astrophysical Journal Letters, 887, L14","work_id":"df5bb41f-a984-484a-a683-c28d52513748","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2024,"title":"2024, The Astrophysical Journal Letters, 968, L22","work_id":"f1372252-bbe4-4a12-a54a-3b1b6a95cfc1","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1146/annurev-astro-081817-051853","year":2018,"title":"Dawson, R. I., & Johnson, J. A. 2018, Annual Review of Astronomy and Astrophysics, 56, 175, doi: 10.1146/annurev-astro-081817-051853","work_id":"cfcac9c3-9397-4808-b990-c15bc3d2d076","ref_index":5,"cited_arxiv_id":"1801.06117","is_internal_anchor":true}],"resolved_work":37,"snapshot_sha256":"fec76f60a17ce85caef409093a1af844522173ae011921e07865a33045f26fb1","internal_anchors":1},"formal_canon":{"evidence_count":2,"snapshot_sha256":"1c7e01ff3c02cb11b4ded40d8c28c64ea702dd685dbdacb1fe2a8cf8e2072fc3"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}