{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:GN4AG7XHTCJSPKNGM76V62LRD3","short_pith_number":"pith:GN4AG7XH","canonical_record":{"source":{"id":"2605.17803","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-05-18T03:26:08Z","cross_cats_sorted":[],"title_canon_sha256":"7d0fe2033d2dc0a5b4eae8c5678a33c65db7351fd5788b7d41f539e27f0fd3c1","abstract_canon_sha256":"5e9ff45d6e6082faa2812b900cb8a9349e1c058d5f914964d0493bf1bd50f88a"},"schema_version":"1.0"},"canonical_sha256":"3378037ee7989327a9a667fd5f69711ecd36bc586091888a1413e49e45512dd0","source":{"kind":"arxiv","id":"2605.17803","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.17803","created_at":"2026-05-20T00:04:59Z"},{"alias_kind":"arxiv_version","alias_value":"2605.17803v1","created_at":"2026-05-20T00:04:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.17803","created_at":"2026-05-20T00:04:59Z"},{"alias_kind":"pith_short_12","alias_value":"GN4AG7XHTCJS","created_at":"2026-05-20T00:04:59Z"},{"alias_kind":"pith_short_16","alias_value":"GN4AG7XHTCJSPKNG","created_at":"2026-05-20T00:04:59Z"},{"alias_kind":"pith_short_8","alias_value":"GN4AG7XH","created_at":"2026-05-20T00:04:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:GN4AG7XHTCJSPKNGM76V62LRD3","target":"record","payload":{"canonical_record":{"source":{"id":"2605.17803","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-05-18T03:26:08Z","cross_cats_sorted":[],"title_canon_sha256":"7d0fe2033d2dc0a5b4eae8c5678a33c65db7351fd5788b7d41f539e27f0fd3c1","abstract_canon_sha256":"5e9ff45d6e6082faa2812b900cb8a9349e1c058d5f914964d0493bf1bd50f88a"},"schema_version":"1.0"},"canonical_sha256":"3378037ee7989327a9a667fd5f69711ecd36bc586091888a1413e49e45512dd0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-20T00:04:59.129545Z","signature_b64":"vCvqVkyirtRSuELIHToTw0rY6tYrjOqNInxtyOjDmJ6QM7Dbqd9O406bDQSxXp+JgoaE3zhlKA2A78wwyGSTDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3378037ee7989327a9a667fd5f69711ecd36bc586091888a1413e49e45512dd0","last_reissued_at":"2026-05-20T00:04:59.128732Z","signature_status":"signed_v1","first_computed_at":"2026-05-20T00:04:59.128732Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.17803","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-20T00:04:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1nUp+EONlJik9sQdRPD9BdskySZGs0y/yObvgGb5brj0KsakNqMDJoGbLOkKuuTtiLhIxQRlpQjb9GVELKaWDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T07:07:37.515093Z"},"content_sha256":"d16adcf72aff841eb2a8d9a60293ad09b7df367d7270494f150c4ddd4913901c","schema_version":"1.0","event_id":"sha256:d16adcf72aff841eb2a8d9a60293ad09b7df367d7270494f150c4ddd4913901c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:GN4AG7XHTCJSPKNGM76V62LRD3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Hycean Interpretation of K2-18b Supported by Photochemical Atmospheric Compositional","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Kiyoshi Kuramoto, Masashi Shimada, Takuya Fujisawa, Tatsuya Yoshida","submitted_at":"2026-05-18T03:26:08Z","abstract_excerpt":"The nature of the sub-Neptune K2-18b is debated between Hycean and mini-Neptune interpretations. We test whether self-consistent Hycean atmospheres are compatible with current JWST transmission spectra by combining one-dimensional photochemical modelling, radiative--convective equilibrium calculations, and forward modelling of transmission spectra. We assume H2-CH4-H2O atmospheres over a liquid ocean, compute altitude-dependent abundances with a 1D photochemical model, and couple them to P-T profiles that avoid runaway greenhouse states. Using the CH4-dominated 2.8-4.0 $\\mu$m band, we constrai"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.17803","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.17803/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-20T00:04:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XfV8Q44LwesUNn4rUaAim4jDjz9EeN/9Ob294dxYGHYrvlRk6Y0Cp3i5E3WG1rAqSywXRa/KEIESv+uCu8EcCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T07:07:37.515486Z"},"content_sha256":"649332e8f33aad195893e7d141ea2ff3e36ff5c14d56e52688d25eb926c4b376","schema_version":"1.0","event_id":"sha256:649332e8f33aad195893e7d141ea2ff3e36ff5c14d56e52688d25eb926c4b376"},{"event_type":"integrity_finding","subject_pith_number":"pith:2026:GN4AG7XHTCJSPKNGM76V62LRD3","target":"integrity","payload":{"note":"Identifier '10.5281/zenodo.20225015' is syntactically valid but the DOI registry (doi.org) returned 404, and Crossref / OpenAlex / internal corpus also have no record. The cited work could not be located through any authoritative source.","snippet":"Fujisawa, T., Shimada, M., Yoshida, T., & Kuramoto, K. 2026, Chemical reaction network and rate coefficients for Hycean atmosphere modeling of K2-18b, Zenodo, Zenodo, doi: 10.5281/zenodo.20225015","arxiv_id":"2605.17803","detector":"doi_compliance","evidence":{"doi":"10.5281/zenodo.20225015","arxiv_id":null,"ref_index":6,"raw_excerpt":"Fujisawa, T., Shimada, M., Yoshida, T., & Kuramoto, K. 2026, Chemical reaction network and rate coefficients for Hycean atmosphere modeling of K2-18b, Zenodo, Zenodo, doi: 10.5281/zenodo.20225015","verdict_class":"cross_source","checked_sources":["crossref_by_doi","openalex_by_doi","doi_org_head"]},"severity":"critical","ref_index":6,"audited_at":"2026-05-20T01:24:37.614241Z","event_type":"pith.integrity.v1","detected_doi":"10.5281/zenodo.20225015","detector_url":"https://pith.science/pith-integrity-protocol#doi_compliance","external_url":null,"finding_type":"unresolvable_identifier","evidence_hash":"9c214ce03a51c6168de5b72c6c79c8acd0b1b9b1408d62848925b35850cb843b","paper_version":1,"verdict_class":"cross_source","resolved_title":null,"detector_version":"1.0.0","detected_arxiv_id":null,"integrity_event_id":3984,"payload_sha256":"b1c0f8c6bf7f01afcebff6d0832b683a39ce88ffbf833a01956d183f51eff467","signature_b64":"ZpFiTH47bwID102mlVuSuEJH0lpdGw7YM41RYzo077JQGWWDst6iUu5DzFH1gng4jsEkFzw8UIi56Mv4FPHSBw==","signing_key_id":"pith-v1-2026-05"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-20T01:27:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vChf9wujjy8lODOPTkGZYOxAa827u55PJAmL0tVnRmtkFK1c5ajNmycucv3aYjor9dR9NkiSiOTy5acfHKCSCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T07:07:37.516413Z"},"content_sha256":"16bcd6f970a561b370787ec708cd6df7d97e9fee9da4d98243cd01f3fbbfa78f","schema_version":"1.0","event_id":"sha256:16bcd6f970a561b370787ec708cd6df7d97e9fee9da4d98243cd01f3fbbfa78f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GN4AG7XHTCJSPKNGM76V62LRD3/bundle.json","state_url":"https://pith.science/pith/GN4AG7XHTCJSPKNGM76V62LRD3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GN4AG7XHTCJSPKNGM76V62LRD3/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-02T07:07:37Z","links":{"resolver":"https://pith.science/pith/GN4AG7XHTCJSPKNGM76V62LRD3","bundle":"https://pith.science/pith/GN4AG7XHTCJSPKNGM76V62LRD3/bundle.json","state":"https://pith.science/pith/GN4AG7XHTCJSPKNGM76V62LRD3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GN4AG7XHTCJSPKNGM76V62LRD3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:GN4AG7XHTCJSPKNGM76V62LRD3","merge_version":"pith-open-graph-merge-v1","event_count":3,"valid_event_count":3,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"5e9ff45d6e6082faa2812b900cb8a9349e1c058d5f914964d0493bf1bd50f88a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-05-18T03:26:08Z","title_canon_sha256":"7d0fe2033d2dc0a5b4eae8c5678a33c65db7351fd5788b7d41f539e27f0fd3c1"},"schema_version":"1.0","source":{"id":"2605.17803","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.17803","created_at":"2026-05-20T00:04:59Z"},{"alias_kind":"arxiv_version","alias_value":"2605.17803v1","created_at":"2026-05-20T00:04:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.17803","created_at":"2026-05-20T00:04:59Z"},{"alias_kind":"pith_short_12","alias_value":"GN4AG7XHTCJS","created_at":"2026-05-20T00:04:59Z"},{"alias_kind":"pith_short_16","alias_value":"GN4AG7XHTCJSPKNG","created_at":"2026-05-20T00:04:59Z"},{"alias_kind":"pith_short_8","alias_value":"GN4AG7XH","created_at":"2026-05-20T00:04:59Z"}],"graph_snapshots":[{"event_id":"sha256:649332e8f33aad195893e7d141ea2ff3e36ff5c14d56e52688d25eb926c4b376","target":"graph","created_at":"2026-05-20T00:04:59Z","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/2605.17803/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The nature of the sub-Neptune K2-18b is debated between Hycean and mini-Neptune interpretations. We test whether self-consistent Hycean atmospheres are compatible with current JWST transmission spectra by combining one-dimensional photochemical modelling, radiative--convective equilibrium calculations, and forward modelling of transmission spectra. We assume H2-CH4-H2O atmospheres over a liquid ocean, compute altitude-dependent abundances with a 1D photochemical model, and couple them to P-T profiles that avoid runaway greenhouse states. Using the CH4-dominated 2.8-4.0 $\\mu$m band, we constrai","authors_text":"Kiyoshi Kuramoto, Masashi Shimada, Takuya Fujisawa, Tatsuya Yoshida","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-05-18T03:26:08Z","title":"A Hycean Interpretation of K2-18b Supported by Photochemical Atmospheric Compositional"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.17803","kind":"arxiv","version":1},"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:d16adcf72aff841eb2a8d9a60293ad09b7df367d7270494f150c4ddd4913901c","target":"record","created_at":"2026-05-20T00:04:59Z","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":"5e9ff45d6e6082faa2812b900cb8a9349e1c058d5f914964d0493bf1bd50f88a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-05-18T03:26:08Z","title_canon_sha256":"7d0fe2033d2dc0a5b4eae8c5678a33c65db7351fd5788b7d41f539e27f0fd3c1"},"schema_version":"1.0","source":{"id":"2605.17803","kind":"arxiv","version":1}},"canonical_sha256":"3378037ee7989327a9a667fd5f69711ecd36bc586091888a1413e49e45512dd0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3378037ee7989327a9a667fd5f69711ecd36bc586091888a1413e49e45512dd0","first_computed_at":"2026-05-20T00:04:59.128732Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-20T00:04:59.128732Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vCvqVkyirtRSuELIHToTw0rY6tYrjOqNInxtyOjDmJ6QM7Dbqd9O406bDQSxXp+JgoaE3zhlKA2A78wwyGSTDw==","signature_status":"signed_v1","signed_at":"2026-05-20T00:04:59.129545Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.17803","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d16adcf72aff841eb2a8d9a60293ad09b7df367d7270494f150c4ddd4913901c","sha256:649332e8f33aad195893e7d141ea2ff3e36ff5c14d56e52688d25eb926c4b376","sha256:16bcd6f970a561b370787ec708cd6df7d97e9fee9da4d98243cd01f3fbbfa78f"],"state_sha256":"ef5251126f85f91342009b21d4b2aaf87f402bdb10b948b6214e2bf9bc273fb5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"06Kbo4nkYpe8XliOkEnjqupc0pxSWSwhHKVX4JL7JU/zWJb9ibX0XosDUMvR81kX0yXimatR4GBiG7ipJoUsCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T07:07:37.518380Z","bundle_sha256":"9ca7734139809393b343a7be24aa75e62a6648204e4a6629eeb00a14c8bb92d2"}}