{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:F7NCWJH3CAX26KT6TH5RXEJ7LZ","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":"fb9c2b2f2cd4dc456bc403c8e64df7fc2439c3d3ca94b2304a3895f3de6bd09a","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-08-11T14:08:41Z","title_canon_sha256":"8d7aa8685503a32d49e442cddbbc58586d52ce8d8a4251829b0abfb23e88bd62"},"schema_version":"1.0","source":{"id":"1708.03548","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.03548","created_at":"2026-05-18T00:34:46Z"},{"alias_kind":"arxiv_version","alias_value":"1708.03548v2","created_at":"2026-05-18T00:34:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.03548","created_at":"2026-05-18T00:34:46Z"},{"alias_kind":"pith_short_12","alias_value":"F7NCWJH3CAX2","created_at":"2026-05-18T12:31:15Z"},{"alias_kind":"pith_short_16","alias_value":"F7NCWJH3CAX26KT6","created_at":"2026-05-18T12:31:15Z"},{"alias_kind":"pith_short_8","alias_value":"F7NCWJH3","created_at":"2026-05-18T12:31:15Z"}],"graph_snapshots":[{"event_id":"sha256:084dfc51fa4b76093bac04b4a1c3e4d6db372a029e4857c578e38b3fa9471e24","target":"graph","created_at":"2026-05-18T00:34:46Z","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 rest-frame UV spectra of three recent tidal disruption events (TDEs), ASASSN-14li, PTF15af and iPTF16fnl display strong nitrogen emission lines but weak or undetectable carbon lines. In these three objects, the upper limits of the C III] $\\lambda 1908$/N III] $\\lambda 1750$ ratio are about two orders of magnitude lower than those of quasars, suggesting a high abundance ratio of [N/C]. With detailed photoionization simulations, we demonstrate that $C^{2+}$ and $N^{2+}$ are formed in the same zone, so the C III]/N III] ratio depends only moderately on the physical conditions in the gas and w","authors_text":"Chenwei Yang, Gary J.Ferland, Hongyan Zhou, Liming Dou, Ning Jiang, Tinggui Wang, Zhenfeng Sheng","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-08-11T14:08:41Z","title":"Carbon and Nitrogen Abundance Ratio In the Broad Line Region of Tidal Disruption Events"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.03548","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":"sha256:7c298ed1081c4a957bea691a0a7088ea1bf60828464fac959a3c173c5102103e","target":"record","created_at":"2026-05-18T00:34:46Z","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":"fb9c2b2f2cd4dc456bc403c8e64df7fc2439c3d3ca94b2304a3895f3de6bd09a","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-08-11T14:08:41Z","title_canon_sha256":"8d7aa8685503a32d49e442cddbbc58586d52ce8d8a4251829b0abfb23e88bd62"},"schema_version":"1.0","source":{"id":"1708.03548","kind":"arxiv","version":2}},"canonical_sha256":"2fda2b24fb102faf2a7e99fb1b913f5e7b151f7f3aed95cc5e66d32f81519a06","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2fda2b24fb102faf2a7e99fb1b913f5e7b151f7f3aed95cc5e66d32f81519a06","first_computed_at":"2026-05-18T00:34:46.555016Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:34:46.555016Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TaO4IR7WDHejptN554OmsMwVvFaybj3Yr45eT7PrVsNAomWTrF3GNc6cRESUjd9tQbUits1AySa9/Rm68OphCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:34:46.555756Z","signed_message":"canonical_sha256_bytes"},"source_id":"1708.03548","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7c298ed1081c4a957bea691a0a7088ea1bf60828464fac959a3c173c5102103e","sha256:084dfc51fa4b76093bac04b4a1c3e4d6db372a029e4857c578e38b3fa9471e24"],"state_sha256":"95f875fc69d387cd194329d1e9fa164675c5fbade144fff8f256a3fc60e0c5ac"}