{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:JA6RJH2ZN6WFDCMUHFLP7SZAGW","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":"953f52cd9ea6f635b933f2b7b861c7dd6e502450e822f268dad8b10e744f2318","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-07-30T07:19:43Z","title_canon_sha256":"30e4544efe57d265c40860398af50ec1afe55d0ee5ce28901d678057dd851397"},"schema_version":"1.0","source":{"id":"1307.8435","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.8435","created_at":"2026-05-18T01:48:32Z"},{"alias_kind":"arxiv_version","alias_value":"1307.8435v1","created_at":"2026-05-18T01:48:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.8435","created_at":"2026-05-18T01:48:32Z"},{"alias_kind":"pith_short_12","alias_value":"JA6RJH2ZN6WF","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_16","alias_value":"JA6RJH2ZN6WFDCMU","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_8","alias_value":"JA6RJH2Z","created_at":"2026-05-18T12:27:49Z"}],"graph_snapshots":[{"event_id":"sha256:a9a0a78ece5f0b42b239c5f7b4e246260e81928f372af3f7dd9dff163819fbad","target":"graph","created_at":"2026-05-18T01:48:32Z","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":"The propagation of a shock wave into a medium is expected to heat the material beyond the shock, producing noticeable effects in intensity line ratios such as [O III]/Halpha. To investigate the occurrence of shocks in planetary nebulae (PNe), we have used all narrowband [O III] and Halpha images of PNe available in the HST archive to build their [O III]/Halpha ratio maps and to search for regions where this ratio is enhanced. Regions with enhanced [O III]/Halpha emission ratio can be ascribed to two different types of morphological structures: bow-shock structures produced by fast collimated o","authors_text":"A. Riera, J.A. Toal\\'a, J.J. Medina, L.F. Miranda, M.A. Guerrero, P.F. Vel\\'azquez, V. Luridiana","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-07-30T07:19:43Z","title":"Unveiling shocks in planetary nebulae"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.8435","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":"sha256:858ec3d14aac7ede8bcf711a65ba493a27e7729b27ec1a84edf74a91b9024415","target":"record","created_at":"2026-05-18T01:48:32Z","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":"953f52cd9ea6f635b933f2b7b861c7dd6e502450e822f268dad8b10e744f2318","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-07-30T07:19:43Z","title_canon_sha256":"30e4544efe57d265c40860398af50ec1afe55d0ee5ce28901d678057dd851397"},"schema_version":"1.0","source":{"id":"1307.8435","kind":"arxiv","version":1}},"canonical_sha256":"483d149f596fac5189943956ffcb2035a1bcf84a5d24a7f5eeb0ad4012645139","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"483d149f596fac5189943956ffcb2035a1bcf84a5d24a7f5eeb0ad4012645139","first_computed_at":"2026-05-18T01:48:32.145366Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:48:32.145366Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bD6ykNZgPEgVcqYUNcnaRBzJkGrTq74F1bALvgcelVFdpMGVD7oy5T0XeDvSpLl0Ye9dyRyeaefD5akO1ddCCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:48:32.145874Z","signed_message":"canonical_sha256_bytes"},"source_id":"1307.8435","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:858ec3d14aac7ede8bcf711a65ba493a27e7729b27ec1a84edf74a91b9024415","sha256:a9a0a78ece5f0b42b239c5f7b4e246260e81928f372af3f7dd9dff163819fbad"],"state_sha256":"53b1bad8b817c4915bd2320450c324058de1952821486415829a850b5436514c"}