{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:QLTVVFM2DP27ZVONYYNT5DC32G","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":"7fc630ec9441860cf565291398cb450845780a429ff10d8b610d2f64eaeb94a3","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-09-22T21:32:30Z","title_canon_sha256":"593557f5a4b93e9bc38264d355df296ca9c714afd4af195ca821941446628df5"},"schema_version":"1.0","source":{"id":"1709.07958","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.07958","created_at":"2026-05-18T00:28:13Z"},{"alias_kind":"arxiv_version","alias_value":"1709.07958v1","created_at":"2026-05-18T00:28:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.07958","created_at":"2026-05-18T00:28:13Z"},{"alias_kind":"pith_short_12","alias_value":"QLTVVFM2DP27","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_16","alias_value":"QLTVVFM2DP27ZVON","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_8","alias_value":"QLTVVFM2","created_at":"2026-05-18T12:31:39Z"}],"graph_snapshots":[{"event_id":"sha256:325f3988fa8f416268e573a94b65ec5ccd7552d922e0ea4bb745938a2938c445","target":"graph","created_at":"2026-05-18T00:28:13Z","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"},"paper":{"abstract_excerpt":"We present deep high-resolution (R~15,000) and high-quality UVES optical spectrophotometry of nine planetary nebulae with dual-dust chemistry. We compute physical conditions from several diagnostics. Ionic abundances for a large number of ions of N, O, Ne, S, Cl, Ar, K, Fe and Kr are derived from collisionally excited lines. Elemental abundances are computed using state-of-the-art ionization correction factors. We derive accurate C/O ratios from optical recombination lines. We have re-analyzed additional high-quality spectra of 14 PNe from the literature following the same methodology. Compari","authors_text":"2), (2) Univ. La Lalguna, (3) IA-UNAM, (4) Konkoly Observatory, (5) Australian National Univ, 6), (7) INAOE, A. I. Karakas (5, Australia, Australia (6), D. A. Garc\\'ia-Hern\\'andez (1, F. Dell'Agli (1, G. Delgado-Inglada (3), Hungary, J. Garc\\'ia-Rojas (1, Mexico, Mexico), M. Lugaro (4, Monash Univ., M. Rodr\\'iguez (7) ((1) IAC, Spain","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-09-22T21:32:30Z","title":"C/O ratios in planetary nebulae with dual-dust chemistry from faint optical recombination lines"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.07958","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":"sha256:9939c72750611b14b8410f987fae1b5ef3633adab91314e66e545239998dbff9","target":"record","created_at":"2026-05-18T00:28:13Z","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":"7fc630ec9441860cf565291398cb450845780a429ff10d8b610d2f64eaeb94a3","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-09-22T21:32:30Z","title_canon_sha256":"593557f5a4b93e9bc38264d355df296ca9c714afd4af195ca821941446628df5"},"schema_version":"1.0","source":{"id":"1709.07958","kind":"arxiv","version":1}},"canonical_sha256":"82e75a959a1bf5fcd5cdc61b3e8c5bd198b1d81e9c90b8c8ed991daec58539c8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"82e75a959a1bf5fcd5cdc61b3e8c5bd198b1d81e9c90b8c8ed991daec58539c8","first_computed_at":"2026-05-18T00:28:13.935071Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:28:13.935071Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"93h7/j/B4OeQJALCthynJAggl07RPRHrRkcXyGSRbVjQZ3KZjhbUuDt44N+fdGwwkDkunntFdZQqA+plt7KLBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:28:13.936040Z","signed_message":"canonical_sha256_bytes"},"source_id":"1709.07958","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9939c72750611b14b8410f987fae1b5ef3633adab91314e66e545239998dbff9","sha256:325f3988fa8f416268e573a94b65ec5ccd7552d922e0ea4bb745938a2938c445"],"state_sha256":"8330c6f03ac1bef331e6a0ebcfba996211beb9e685eb6e0ed51fe3bcc5991ed7"}