{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:GQG7VB6MKE4QVU6W3J2I7MWTFL","short_pith_number":"pith:GQG7VB6M","canonical_record":{"source":{"id":"1505.05323","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-05-20T11:26:09Z","cross_cats_sorted":[],"title_canon_sha256":"e8048c6aa6be62a0f0ed9b0c4a1f5d76e4d9d83a401e5e9506d6a48daf308fa0","abstract_canon_sha256":"abe1a2a2258bb7b58e986a9ac909537193ceac4f037a32a3fffed99ac16b5875"},"schema_version":"1.0"},"canonical_sha256":"340dfa87cc51390ad3d6da748fb2d32ac57e9c54ff7ca7a465f90aced9b6f866","source":{"kind":"arxiv","id":"1505.05323","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.05323","created_at":"2026-05-18T01:36:53Z"},{"alias_kind":"arxiv_version","alias_value":"1505.05323v1","created_at":"2026-05-18T01:36:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.05323","created_at":"2026-05-18T01:36:53Z"},{"alias_kind":"pith_short_12","alias_value":"GQG7VB6MKE4Q","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_16","alias_value":"GQG7VB6MKE4QVU6W","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_8","alias_value":"GQG7VB6M","created_at":"2026-05-18T12:29:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:GQG7VB6MKE4QVU6W3J2I7MWTFL","target":"record","payload":{"canonical_record":{"source":{"id":"1505.05323","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-05-20T11:26:09Z","cross_cats_sorted":[],"title_canon_sha256":"e8048c6aa6be62a0f0ed9b0c4a1f5d76e4d9d83a401e5e9506d6a48daf308fa0","abstract_canon_sha256":"abe1a2a2258bb7b58e986a9ac909537193ceac4f037a32a3fffed99ac16b5875"},"schema_version":"1.0"},"canonical_sha256":"340dfa87cc51390ad3d6da748fb2d32ac57e9c54ff7ca7a465f90aced9b6f866","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:36:53.426928Z","signature_b64":"LlhXf1H9SIvHV0bf//NLdW3R5bOPuPQKGtsw4wrX+Hu9BQ7Iglw1y0USHOsqAtNpfDqT8sOT5rqkSw+PuG/VDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"340dfa87cc51390ad3d6da748fb2d32ac57e9c54ff7ca7a465f90aced9b6f866","last_reissued_at":"2026-05-18T01:36:53.426418Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:36:53.426418Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1505.05323","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:36:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3eb6A7XbgythS3ZpM937bR1sLAZfLvK/YWKSg0up7y3B1AHXejWLFD3bc8G1iKWb1HC2oVM6wOcp/KL9TcVxAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T22:22:44.438129Z"},"content_sha256":"365a0db79709404fbb5ee4f55a3b95c21e6c1872b09a45aa3696eaec5fbd88e5","schema_version":"1.0","event_id":"sha256:365a0db79709404fbb5ee4f55a3b95c21e6c1872b09a45aa3696eaec5fbd88e5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:GQG7VB6MKE4QVU6W3J2I7MWTFL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Constraints on explosive silicon burning in core-collapse supernovae from measured Ni/Fe ratios","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Heger, A. Jerkstrand, B. M\\\"uller, C. Fransson, F. X. Timmes, G. Magkotsios, J. Sollerman, J. Spyromilio, S. A. Sim, S. J. Smartt","submitted_at":"2015-05-20T11:26:09Z","abstract_excerpt":"Measurements of explosive nucleosynthesis yields in core-collapse supernovae provide tests for explosion models. We investigate constraints on explosive conditions derivable from measured amounts of nickel and iron after radioactive decays using nucleosynthesis networks with parameterized thermodynamic trajectories. The Ni/Fe ratio is for most regimes dominated by the production ratio of 58Ni/(54Fe + 56Ni), which tends to grow with higher neutron excess and with higher entropy. For SN 2012ec, a supernova that produced a Ni/Fe ratio of $3.4\\pm1.2$ times solar, we find that burning of a fuel wit"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.05323","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:36:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3TBeUqUPazbeJZpKPpRfCa/tNB1KA+Hwg3N2C3EIapkd02cHk4hdN2vrQPLsaGXj2tLHcungmYtPP7OMtHrCCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T22:22:44.438758Z"},"content_sha256":"887e976ade79b513f90a663ab8515e51e721d4546ee2d24ac7c44bbae1a0bdb3","schema_version":"1.0","event_id":"sha256:887e976ade79b513f90a663ab8515e51e721d4546ee2d24ac7c44bbae1a0bdb3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GQG7VB6MKE4QVU6W3J2I7MWTFL/bundle.json","state_url":"https://pith.science/pith/GQG7VB6MKE4QVU6W3J2I7MWTFL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GQG7VB6MKE4QVU6W3J2I7MWTFL/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-24T22:22:44Z","links":{"resolver":"https://pith.science/pith/GQG7VB6MKE4QVU6W3J2I7MWTFL","bundle":"https://pith.science/pith/GQG7VB6MKE4QVU6W3J2I7MWTFL/bundle.json","state":"https://pith.science/pith/GQG7VB6MKE4QVU6W3J2I7MWTFL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GQG7VB6MKE4QVU6W3J2I7MWTFL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:GQG7VB6MKE4QVU6W3J2I7MWTFL","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":"abe1a2a2258bb7b58e986a9ac909537193ceac4f037a32a3fffed99ac16b5875","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-05-20T11:26:09Z","title_canon_sha256":"e8048c6aa6be62a0f0ed9b0c4a1f5d76e4d9d83a401e5e9506d6a48daf308fa0"},"schema_version":"1.0","source":{"id":"1505.05323","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.05323","created_at":"2026-05-18T01:36:53Z"},{"alias_kind":"arxiv_version","alias_value":"1505.05323v1","created_at":"2026-05-18T01:36:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.05323","created_at":"2026-05-18T01:36:53Z"},{"alias_kind":"pith_short_12","alias_value":"GQG7VB6MKE4Q","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_16","alias_value":"GQG7VB6MKE4QVU6W","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_8","alias_value":"GQG7VB6M","created_at":"2026-05-18T12:29:22Z"}],"graph_snapshots":[{"event_id":"sha256:887e976ade79b513f90a663ab8515e51e721d4546ee2d24ac7c44bbae1a0bdb3","target":"graph","created_at":"2026-05-18T01:36:53Z","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":"Measurements of explosive nucleosynthesis yields in core-collapse supernovae provide tests for explosion models. We investigate constraints on explosive conditions derivable from measured amounts of nickel and iron after radioactive decays using nucleosynthesis networks with parameterized thermodynamic trajectories. The Ni/Fe ratio is for most regimes dominated by the production ratio of 58Ni/(54Fe + 56Ni), which tends to grow with higher neutron excess and with higher entropy. For SN 2012ec, a supernova that produced a Ni/Fe ratio of $3.4\\pm1.2$ times solar, we find that burning of a fuel wit","authors_text":"A. Heger, A. Jerkstrand, B. M\\\"uller, C. Fransson, F. X. Timmes, G. Magkotsios, J. Sollerman, J. Spyromilio, S. A. Sim, S. J. Smartt","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-05-20T11:26:09Z","title":"Constraints on explosive silicon burning in core-collapse supernovae from measured Ni/Fe ratios"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.05323","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":"sha256:365a0db79709404fbb5ee4f55a3b95c21e6c1872b09a45aa3696eaec5fbd88e5","target":"record","created_at":"2026-05-18T01:36:53Z","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":"abe1a2a2258bb7b58e986a9ac909537193ceac4f037a32a3fffed99ac16b5875","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-05-20T11:26:09Z","title_canon_sha256":"e8048c6aa6be62a0f0ed9b0c4a1f5d76e4d9d83a401e5e9506d6a48daf308fa0"},"schema_version":"1.0","source":{"id":"1505.05323","kind":"arxiv","version":1}},"canonical_sha256":"340dfa87cc51390ad3d6da748fb2d32ac57e9c54ff7ca7a465f90aced9b6f866","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"340dfa87cc51390ad3d6da748fb2d32ac57e9c54ff7ca7a465f90aced9b6f866","first_computed_at":"2026-05-18T01:36:53.426418Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:36:53.426418Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LlhXf1H9SIvHV0bf//NLdW3R5bOPuPQKGtsw4wrX+Hu9BQ7Iglw1y0USHOsqAtNpfDqT8sOT5rqkSw+PuG/VDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:36:53.426928Z","signed_message":"canonical_sha256_bytes"},"source_id":"1505.05323","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:365a0db79709404fbb5ee4f55a3b95c21e6c1872b09a45aa3696eaec5fbd88e5","sha256:887e976ade79b513f90a663ab8515e51e721d4546ee2d24ac7c44bbae1a0bdb3"],"state_sha256":"3563bf85fda5baef03f5f6987f1813c611588726a364237a623f7303b660c828"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4IwAFSAx3OfCa3GH1KgPrs//NZPX403CveDmaYGN2F5s1RJa8yz88t9idDqLm9uH+gbNKgpTR/asV5j7OdG3AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-24T22:22:44.442519Z","bundle_sha256":"632c60189d9394babc8c40087ff7295e92229f4cbdbd7015d85d4be57e7f040c"}}