{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:7GNUGTN6YF6M22KY742I76RMOW","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"584e01e5850b181fd546f6a62e954fc13009ab67f45e5a6e73497151cda5c600","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2024-01-20T02:16:18Z","title_canon_sha256":"2ef9cbfab684045ee739417698480e95a24bb1ddb7924753121de5236aee735b"},"schema_version":"1.0","source":{"id":"2401.11082","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2401.11082","created_at":"2026-07-05T07:41:02Z"},{"alias_kind":"arxiv_version","alias_value":"2401.11082v2","created_at":"2026-07-05T07:41:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2401.11082","created_at":"2026-07-05T07:41:02Z"},{"alias_kind":"pith_short_12","alias_value":"7GNUGTN6YF6M","created_at":"2026-07-05T07:41:02Z"},{"alias_kind":"pith_short_16","alias_value":"7GNUGTN6YF6M22KY","created_at":"2026-07-05T07:41:02Z"},{"alias_kind":"pith_short_8","alias_value":"7GNUGTN6","created_at":"2026-07-05T07:41:02Z"}],"graph_snapshots":[{"event_id":"sha256:c0a63ab8c63dd32effc44b7f8ea964bf02439c027961c81c63c0319ac439addd","target":"graph","created_at":"2026-07-05T07:41:02Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2401.11082/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"JWST recently measured the transmission spectrum of K2-18b, a habitable-zone sub-Neptune exoplanet, detecting CH$_4$ and CO$_2$ in its atmosphere. The discovery paper argued the data are best explained by a habitable \"Hycean\" world, consisting of a relatively thin H$_2$-dominated atmosphere overlying a liquid water ocean. Here, we use photochemical and climate models to simulate K2-18b as both a Hycean planet and a gas-rich mini-Neptune with no defined surface. We find that a lifeless Hycean world is hard to reconcile with the JWST observations because photochemistry only supports $< 1$ part-p","authors_text":"Joshua Krissansen-Totton, Kevin Zahnle, Natasha E. Batalha, Nicholas F. Wogan, Renyu Hu, Shang-Min Tsai","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2024-01-20T02:16:18Z","title":"JWST observations of K2-18b can be explained by a gas-rich mini-Neptune with no habitable surface"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2401.11082","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:d4b0a22c481d255275c7792166975b917af85d35d5dafe3ca40885ecb9a7ba50","target":"record","created_at":"2026-07-05T07:41:02Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"584e01e5850b181fd546f6a62e954fc13009ab67f45e5a6e73497151cda5c600","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2024-01-20T02:16:18Z","title_canon_sha256":"2ef9cbfab684045ee739417698480e95a24bb1ddb7924753121de5236aee735b"},"schema_version":"1.0","source":{"id":"2401.11082","kind":"arxiv","version":2}},"canonical_sha256":"f99b434dbec17ccd6958ff348ffa2c7582800ac46f7496eb1c88a6ccea98eb72","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f99b434dbec17ccd6958ff348ffa2c7582800ac46f7496eb1c88a6ccea98eb72","first_computed_at":"2026-07-05T07:41:02.424246Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:41:02.424246Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tvKDS2I57F/8HkQ/bh3LlDF17yqvAmTPYpi6shx+vstLeAKM9O2jUjVzi9tioyNyY+Qpp8L6xIMBrxjQGLa0Aw==","signature_status":"signed_v1","signed_at":"2026-07-05T07:41:02.424726Z","signed_message":"canonical_sha256_bytes"},"source_id":"2401.11082","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d4b0a22c481d255275c7792166975b917af85d35d5dafe3ca40885ecb9a7ba50","sha256:c0a63ab8c63dd32effc44b7f8ea964bf02439c027961c81c63c0319ac439addd"],"state_sha256":"3bcce64c259d2dec6b98c2f7f4f6aa0ffd34fd8bacc67279f70abf32f519d553"}