{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:JK3IOEEOS6QDT46OFMPZ5ALOIK","short_pith_number":"pith:JK3IOEEO","canonical_record":{"source":{"id":"1107.2233","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-12T10:16:23Z","cross_cats_sorted":[],"title_canon_sha256":"df5c82677f03279c3bb093b4a2649f80598fdb8696464cfe62b5b857b32a7a99","abstract_canon_sha256":"4e42710cc9a23f0b86b904e9b7c89bc7743dea9deed99edf86faba9a72e110fb"},"schema_version":"1.0"},"canonical_sha256":"4ab687108e97a039f3ce2b1f9e816e428e503744d8f1214990684d81f79ad0ff","source":{"kind":"arxiv","id":"1107.2233","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.2233","created_at":"2026-05-18T04:14:17Z"},{"alias_kind":"arxiv_version","alias_value":"1107.2233v2","created_at":"2026-05-18T04:14:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.2233","created_at":"2026-05-18T04:14:17Z"},{"alias_kind":"pith_short_12","alias_value":"JK3IOEEOS6QD","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_16","alias_value":"JK3IOEEOS6QDT46O","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_8","alias_value":"JK3IOEEO","created_at":"2026-05-18T12:26:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:JK3IOEEOS6QDT46OFMPZ5ALOIK","target":"record","payload":{"canonical_record":{"source":{"id":"1107.2233","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-12T10:16:23Z","cross_cats_sorted":[],"title_canon_sha256":"df5c82677f03279c3bb093b4a2649f80598fdb8696464cfe62b5b857b32a7a99","abstract_canon_sha256":"4e42710cc9a23f0b86b904e9b7c89bc7743dea9deed99edf86faba9a72e110fb"},"schema_version":"1.0"},"canonical_sha256":"4ab687108e97a039f3ce2b1f9e816e428e503744d8f1214990684d81f79ad0ff","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:14:17.763661Z","signature_b64":"qRwjmaVcuS8iKnpLd3HHN9fKKH/p5tYsG0N7IrSnlGfkciAOxQvKR9EL2nER6cDzqGjznwGrcWIGH/+Dn3HpDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4ab687108e97a039f3ce2b1f9e816e428e503744d8f1214990684d81f79ad0ff","last_reissued_at":"2026-05-18T04:14:17.762988Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:14:17.762988Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1107.2233","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:14:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"euuu7BK0q2k8/CLtbbiMjHbSZ/L1+m4H/4ajwyy9GkmHF/kvdnkD9JAiSm8bRmSgVu95pOtaUCI/4L3vM5+BDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T18:58:08.061759Z"},"content_sha256":"dcf04c16d268e46e5e9ac3ed440cd1ab636bf001b6c4d628c9669537fcdfda7a","schema_version":"1.0","event_id":"sha256:dcf04c16d268e46e5e9ac3ed440cd1ab636bf001b6c4d628c9669537fcdfda7a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:JK3IOEEOS6QDT46OFMPZ5ALOIK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Nucleosynthesis during the Merger of White Dwarfs and the Origin of R Coronae Borealis Stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"E. Garc\\'ia-Berro, J. Isern, J. Jos\\'e, L. G. Althaus, P. Lor\\'en-Aguilar, R. Longland","submitted_at":"2011-07-12T10:16:23Z","abstract_excerpt":"Many hydrogen deficient stars are characterised by surface abundance patterns that are hard to reconcile with conventional stellar evolution. Instead, it has been suggested that they may represent the result of a merger episode between a helium and a carbon-oxygen white dwarf. In this Letter, we present a nucleosynthesis study of the merger of a 0.4 M_sol helium white dwarf with a 0.8 M_sol carbon-oxygen white dwarf, by coupling the thermodynamic history of Smoothed Particle Hydrodynamics particles with a post-processing code. The resulting chemical abundance pattern, particularly for oxygen a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.2233","kind":"arxiv","version":2},"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":"2026-05-18T04:14:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"w5WBgCk2NfrKXSCU0LL6iMKxCU2jE3/+rcx8TUdf4dAfKcHHvQLTnwtyUSenbInrx4dMWucD/4m1ExqUCc/ICQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T18:58:08.062325Z"},"content_sha256":"f12a53b7488dc0564708e82e32318aa3501f3b78a658c92cfd4d3ab9aac131ff","schema_version":"1.0","event_id":"sha256:f12a53b7488dc0564708e82e32318aa3501f3b78a658c92cfd4d3ab9aac131ff"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JK3IOEEOS6QDT46OFMPZ5ALOIK/bundle.json","state_url":"https://pith.science/pith/JK3IOEEOS6QDT46OFMPZ5ALOIK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JK3IOEEOS6QDT46OFMPZ5ALOIK/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":"2026-05-31T18:58:08Z","links":{"resolver":"https://pith.science/pith/JK3IOEEOS6QDT46OFMPZ5ALOIK","bundle":"https://pith.science/pith/JK3IOEEOS6QDT46OFMPZ5ALOIK/bundle.json","state":"https://pith.science/pith/JK3IOEEOS6QDT46OFMPZ5ALOIK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JK3IOEEOS6QDT46OFMPZ5ALOIK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:JK3IOEEOS6QDT46OFMPZ5ALOIK","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":"4e42710cc9a23f0b86b904e9b7c89bc7743dea9deed99edf86faba9a72e110fb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-12T10:16:23Z","title_canon_sha256":"df5c82677f03279c3bb093b4a2649f80598fdb8696464cfe62b5b857b32a7a99"},"schema_version":"1.0","source":{"id":"1107.2233","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.2233","created_at":"2026-05-18T04:14:17Z"},{"alias_kind":"arxiv_version","alias_value":"1107.2233v2","created_at":"2026-05-18T04:14:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.2233","created_at":"2026-05-18T04:14:17Z"},{"alias_kind":"pith_short_12","alias_value":"JK3IOEEOS6QD","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_16","alias_value":"JK3IOEEOS6QDT46O","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_8","alias_value":"JK3IOEEO","created_at":"2026-05-18T12:26:32Z"}],"graph_snapshots":[{"event_id":"sha256:f12a53b7488dc0564708e82e32318aa3501f3b78a658c92cfd4d3ab9aac131ff","target":"graph","created_at":"2026-05-18T04:14:17Z","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":"Many hydrogen deficient stars are characterised by surface abundance patterns that are hard to reconcile with conventional stellar evolution. Instead, it has been suggested that they may represent the result of a merger episode between a helium and a carbon-oxygen white dwarf. In this Letter, we present a nucleosynthesis study of the merger of a 0.4 M_sol helium white dwarf with a 0.8 M_sol carbon-oxygen white dwarf, by coupling the thermodynamic history of Smoothed Particle Hydrodynamics particles with a post-processing code. The resulting chemical abundance pattern, particularly for oxygen a","authors_text":"E. Garc\\'ia-Berro, J. Isern, J. Jos\\'e, L. G. Althaus, P. Lor\\'en-Aguilar, R. Longland","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-12T10:16:23Z","title":"Nucleosynthesis during the Merger of White Dwarfs and the Origin of R Coronae Borealis Stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.2233","kind":"arxiv","version":2},"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:dcf04c16d268e46e5e9ac3ed440cd1ab636bf001b6c4d628c9669537fcdfda7a","target":"record","created_at":"2026-05-18T04:14:17Z","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":"4e42710cc9a23f0b86b904e9b7c89bc7743dea9deed99edf86faba9a72e110fb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-12T10:16:23Z","title_canon_sha256":"df5c82677f03279c3bb093b4a2649f80598fdb8696464cfe62b5b857b32a7a99"},"schema_version":"1.0","source":{"id":"1107.2233","kind":"arxiv","version":2}},"canonical_sha256":"4ab687108e97a039f3ce2b1f9e816e428e503744d8f1214990684d81f79ad0ff","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4ab687108e97a039f3ce2b1f9e816e428e503744d8f1214990684d81f79ad0ff","first_computed_at":"2026-05-18T04:14:17.762988Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:14:17.762988Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qRwjmaVcuS8iKnpLd3HHN9fKKH/p5tYsG0N7IrSnlGfkciAOxQvKR9EL2nER6cDzqGjznwGrcWIGH/+Dn3HpDg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:14:17.763661Z","signed_message":"canonical_sha256_bytes"},"source_id":"1107.2233","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dcf04c16d268e46e5e9ac3ed440cd1ab636bf001b6c4d628c9669537fcdfda7a","sha256:f12a53b7488dc0564708e82e32318aa3501f3b78a658c92cfd4d3ab9aac131ff"],"state_sha256":"709dae6322794438bc0261b327ed9d64765a015dcc944ab08ce447b637717644"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DXoTegmZE876i8zfZt4AjD3+C7bootgebw8cvck6CfLYj8LgOEj8xrnUf5nMWniTNbn3NQCPoMAeVFW2ZHhgBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T18:58:08.067041Z","bundle_sha256":"22bdcc46cdda3290e86d521b98d76dc65dca67a37ee859a4252a12bd319f6f0f"}}