{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:EJYSZUM4LPZTJNCFPBBA5BPZ5A","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":"07f5c8b4008924c75b27e8cafc4ab11114cc51c0f98c444f749c4c367e2e0234","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-12-07T01:57:25Z","title_canon_sha256":"daed1f4d38cfde0be8dbe1375417d1d6ee2ccd0217a438c8f81ddf3341e301dc"},"schema_version":"1.0","source":{"id":"1612.02097","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.02097","created_at":"2026-05-18T00:47:49Z"},{"alias_kind":"arxiv_version","alias_value":"1612.02097v3","created_at":"2026-05-18T00:47:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.02097","created_at":"2026-05-18T00:47:49Z"},{"alias_kind":"pith_short_12","alias_value":"EJYSZUM4LPZT","created_at":"2026-05-18T12:30:12Z"},{"alias_kind":"pith_short_16","alias_value":"EJYSZUM4LPZTJNCF","created_at":"2026-05-18T12:30:12Z"},{"alias_kind":"pith_short_8","alias_value":"EJYSZUM4","created_at":"2026-05-18T12:30:12Z"}],"graph_snapshots":[{"event_id":"sha256:a1e61b5285cff79c78432f20569fff4222ce6886b65cbfb65857ec2dcc36e2a1","target":"graph","created_at":"2026-05-18T00:47:49Z","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 a new empirical fitting method for the optical light curves of Type Ia supernovae (SNe~Ia). We find that a variant broken-power-law function provides a good fit, with the simple assumption that the optical emission is approximately the blackbody emission of the expanding fireball. This function is mathematically analytic and is derived directly from the photospheric velocity evolution. When deriving the function, we assume that both the blackbody temperature and photospheric velocity are constant, but the final function is able to accommodate these changes during the fitting procedu","authors_text":"Alexei V. Filippenko (UCB), Weikang Zheng (UCB)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-12-07T01:57:25Z","title":"An Empirical Fitting Method for Type Ia Supernova Light Curves: A Case Study of SN 2011fe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.02097","kind":"arxiv","version":3},"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:a9db55de770549175ac6cbfe5bbfa304726bd9f4bb6cc7538f1efbbb71a66873","target":"record","created_at":"2026-05-18T00:47:49Z","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":"07f5c8b4008924c75b27e8cafc4ab11114cc51c0f98c444f749c4c367e2e0234","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-12-07T01:57:25Z","title_canon_sha256":"daed1f4d38cfde0be8dbe1375417d1d6ee2ccd0217a438c8f81ddf3341e301dc"},"schema_version":"1.0","source":{"id":"1612.02097","kind":"arxiv","version":3}},"canonical_sha256":"22712cd19c5bf334b44578420e85f9e80e7660bde5738e011f74c9807eb851cd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"22712cd19c5bf334b44578420e85f9e80e7660bde5738e011f74c9807eb851cd","first_computed_at":"2026-05-18T00:47:49.006700Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:47:49.006700Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8/M+mI8KKretIxTDQEn5amp3jlnheDPVkB/ivpzJsrtJjrhTJscHLpW0GOfFCnKZIv8tXzpeXCS3iQQGj9QGDw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:47:49.007369Z","signed_message":"canonical_sha256_bytes"},"source_id":"1612.02097","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a9db55de770549175ac6cbfe5bbfa304726bd9f4bb6cc7538f1efbbb71a66873","sha256:a1e61b5285cff79c78432f20569fff4222ce6886b65cbfb65857ec2dcc36e2a1"],"state_sha256":"7cb215bfe0a9485e8956b396ad88f3ef296072e7378d24c807e460f7775eb6a7"}