{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:HYY4YOEMA2T7LNSQ6PZEXXQCLP","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":"f239567ab3485a29d6c3003c7bc5894b6af3a9319fc9601de2008d9ecde24397","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-08-07T12:53:48Z","title_canon_sha256":"6499a7d6b39aadc61405fc9b491f589a2c36c4b184280ccd3c9f8bcde7e7142a"},"schema_version":"1.0","source":{"id":"1808.02330","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.02330","created_at":"2026-05-18T00:08:05Z"},{"alias_kind":"arxiv_version","alias_value":"1808.02330v1","created_at":"2026-05-18T00:08:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.02330","created_at":"2026-05-18T00:08:05Z"},{"alias_kind":"pith_short_12","alias_value":"HYY4YOEMA2T7","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"HYY4YOEMA2T7LNSQ","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"HYY4YOEM","created_at":"2026-05-18T12:32:28Z"}],"graph_snapshots":[{"event_id":"sha256:efae4f08a96f048083f9d4e536855338140157e909dd41316e40679c3b1062a2","target":"graph","created_at":"2026-05-18T00:08:05Z","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":"Key information about the progenitor system and the explosion mechanism of Type Ia supernovae (SNe~Ia) can be obtained from early observations, within a few days from explosion. iPTF16abc was discovered as a young SN~Ia with excellent early time data. Here, we present photometry and spectroscopy of the SN in the nebular phase. A comparison of the early time data with a sample of SNe~Ia shows distinct features, differing from normal SNe~Ia at early phases but similar to normal SNe~Ia at a few weeks after maximum light (i.e. the transitional phase) and well into the nebular phase. The transparen","authors_text":"A.A.Miller, A. Goobar, C. Fransson, J. Johansson, M. Bulla, R. Lunnan, S. Dhawan, S. Papadogiannakis, S.R. Kulkarni","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-08-07T12:53:48Z","title":"iPTF16abc and the population of Type Ia supernovae: Comparing the photospheric, transitional and nebular phases"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.02330","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:d05bdb6c9b3fc76fa8b555e993c2a3fa727f715a31c1ed0584caad4a3213d6ec","target":"record","created_at":"2026-05-18T00:08:05Z","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":"f239567ab3485a29d6c3003c7bc5894b6af3a9319fc9601de2008d9ecde24397","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-08-07T12:53:48Z","title_canon_sha256":"6499a7d6b39aadc61405fc9b491f589a2c36c4b184280ccd3c9f8bcde7e7142a"},"schema_version":"1.0","source":{"id":"1808.02330","kind":"arxiv","version":1}},"canonical_sha256":"3e31cc388c06a7f5b650f3f24bde025bc5c29921dcf8f2bcf460ad66ee48cf49","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3e31cc388c06a7f5b650f3f24bde025bc5c29921dcf8f2bcf460ad66ee48cf49","first_computed_at":"2026-05-18T00:08:05.673753Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:08:05.673753Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fQMBxEhHyF8EqALiWHFTS1X27wbaiw/sOerawsPcouxDDMhwML6SfWKcW0GgVhIZS2GKs2noUdvg+lh1qZkgAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:08:05.674524Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.02330","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d05bdb6c9b3fc76fa8b555e993c2a3fa727f715a31c1ed0584caad4a3213d6ec","sha256:efae4f08a96f048083f9d4e536855338140157e909dd41316e40679c3b1062a2"],"state_sha256":"a725584ebc7d3e415502d78deb5fa30ba9510443dc6da5a7ee14873948de1e28"}