{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:QDE4G5Q5IKQRULD45PZDWVTYSZ","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":"fc1b79b5986c4e1c494b7453ba1130c0e9bcf95eff58110530fb36264a565d00","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-07-05T14:47:33Z","title_canon_sha256":"f89735540ad8be6873108f84fabf7bb7d0e90e5558808c65c494d722e023e469"},"schema_version":"1.0","source":{"id":"astro-ph/9907052","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9907052","created_at":"2026-07-04T15:20:41Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9907052v1","created_at":"2026-07-04T15:20:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9907052","created_at":"2026-07-04T15:20:41Z"},{"alias_kind":"pith_short_12","alias_value":"QDE4G5Q5IKQR","created_at":"2026-07-04T15:20:41Z"},{"alias_kind":"pith_short_16","alias_value":"QDE4G5Q5IKQRULD4","created_at":"2026-07-04T15:20:41Z"},{"alias_kind":"pith_short_8","alias_value":"QDE4G5Q5","created_at":"2026-07-04T15:20:41Z"}],"graph_snapshots":[{"event_id":"sha256:381abd0ed2e5105909b73fd793ecdf4e276e4ba4842695d0c09025431f52019f","target":"graph","created_at":"2026-07-04T15:20:41Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/astro-ph/9907052/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We develop a method for estimating the host galaxy dust extinction for type Ia supernovae based on an observational coincidence first noted by Lira (1995), who found that the B-V evolution during the period from 30-90 days after V maximum is remarkably similar for all events, regardless of light curve shape. This fact is used to calibrate the dependence of the B(max)-V(max) and V(max)-I(max) colors on the light curve decline rate parameter delta-m15, which can, in turn, be used to separately estimate the host galaxy extinction. Using these methods to eliminate the effects of reddening, we reex","authors_text":"J. Maza, M. Hamuy, M. M. Phillips, N. B. Suntzeff, P. Lira, R. A. Schommer","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1999-07-05T14:47:33Z","title":"The Reddening-Free Decline Rate Versus Luminosity Relationship for Type Ia Supernovae"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9907052","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":"sha256:14b14f9621e2133df162a43d40fe98a9fe4bb81c7804ca10f7b05c66b5ed5585","target":"record","created_at":"2026-07-04T15:20:41Z","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":"fc1b79b5986c4e1c494b7453ba1130c0e9bcf95eff58110530fb36264a565d00","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-07-05T14:47:33Z","title_canon_sha256":"f89735540ad8be6873108f84fabf7bb7d0e90e5558808c65c494d722e023e469"},"schema_version":"1.0","source":{"id":"astro-ph/9907052","kind":"arxiv","version":1}},"canonical_sha256":"80c9c3761d42a11a2c7cebf23b567896618ba43cc72af0f937ffd795b7e483a3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"80c9c3761d42a11a2c7cebf23b567896618ba43cc72af0f937ffd795b7e483a3","first_computed_at":"2026-07-04T15:20:41.876547Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:20:41.876547Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wvuaA37OJ/MfhXlGL2AIrMkvZqS9Bo+Di5Ft71iMudDlxKoI+pevHCo6Qzy4oQyPLVfjRP8kEZWozXH+mo5cAQ==","signature_status":"signed_v1","signed_at":"2026-07-04T15:20:41.876952Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9907052","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:14b14f9621e2133df162a43d40fe98a9fe4bb81c7804ca10f7b05c66b5ed5585","sha256:381abd0ed2e5105909b73fd793ecdf4e276e4ba4842695d0c09025431f52019f"],"state_sha256":"a1dc9676293980eeedff8938bdf2ffca5edde836d44aee1a51fe70df2b92cce1"}