{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:ZRV4WB2TDPRHSPQNU3T5C2CO44","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":"67ab4303ed605756190ec97e0a2118a6e4da05f5258651c16d765be68aa9faf6","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-08-22T19:39:21Z","title_canon_sha256":"deb23e633b7c8629ea616be57b8188a0c34c8f2507dcc6f5c31f7dee7f6287bf"},"schema_version":"1.0","source":{"id":"1408.5397","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.5397","created_at":"2026-05-18T02:31:46Z"},{"alias_kind":"arxiv_version","alias_value":"1408.5397v1","created_at":"2026-05-18T02:31:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.5397","created_at":"2026-05-18T02:31:46Z"},{"alias_kind":"pith_short_12","alias_value":"ZRV4WB2TDPRH","created_at":"2026-05-18T12:28:59Z"},{"alias_kind":"pith_short_16","alias_value":"ZRV4WB2TDPRHSPQN","created_at":"2026-05-18T12:28:59Z"},{"alias_kind":"pith_short_8","alias_value":"ZRV4WB2T","created_at":"2026-05-18T12:28:59Z"}],"graph_snapshots":[{"event_id":"sha256:e93da39fb6807385320eb7d4c484514e695e1d7d2b32a1bc7134560c8042494a","target":"graph","created_at":"2026-05-18T02:31:46Z","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":"We present the first quantitative spectroscopic modeling of an early-time supernova that interacts with its progenitor wind. Using the radiative transfer code CMFGEN, we investigate the recently-reported 15.5 h post-explosion spectrum of the type IIb SN 2013cu. For the first time, we are able to directly measure the chemical abundances of a SN progenitor and find a relatively H-rich wind, with H and He abundances (by mass) of X=0.46 +- 0.2 and Y=0.52 +- 0.2, respectively. The wind is enhanced in N and depleted in C relative to solar values (mass fractions of 8.2e-3 and 1e-5). We obtain that a ","authors_text":"Jose H. Groh (Geneva Observatory)","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-08-22T19:39:21Z","title":"Early-time spectra of supernovae and their precursor winds: the luminous blue variable/yellow hypergiant progenitor of SN 2013cu"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.5397","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":"sha256:83b0cb59e9983c57945484116eb00595f3b6a789634ffc55ca4e5543f8737114","target":"record","created_at":"2026-05-18T02:31:46Z","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":"67ab4303ed605756190ec97e0a2118a6e4da05f5258651c16d765be68aa9faf6","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-08-22T19:39:21Z","title_canon_sha256":"deb23e633b7c8629ea616be57b8188a0c34c8f2507dcc6f5c31f7dee7f6287bf"},"schema_version":"1.0","source":{"id":"1408.5397","kind":"arxiv","version":1}},"canonical_sha256":"cc6bcb07531be2793e0da6e7d1684ee7126a1a422d2acd6891a709a769ab1b91","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cc6bcb07531be2793e0da6e7d1684ee7126a1a422d2acd6891a709a769ab1b91","first_computed_at":"2026-05-18T02:31:46.814423Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:31:46.814423Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bF5u4YvvYwHpeuKxD/P7z6KVurW3MZsKWiAsrWM/uzhkAk3AJRs65Hg2Wkp+X+9KWibDhnsTIQClLRc56+uOBw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:31:46.814905Z","signed_message":"canonical_sha256_bytes"},"source_id":"1408.5397","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:83b0cb59e9983c57945484116eb00595f3b6a789634ffc55ca4e5543f8737114","sha256:e93da39fb6807385320eb7d4c484514e695e1d7d2b32a1bc7134560c8042494a"],"state_sha256":"f04eeac743ea90cf1cf43f57f72cab6489e089d979d6bf0479c622f427d5d1d2"}