{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:HUCU6YJSDE6CJ4PI6U7CESMLSG","short_pith_number":"pith:HUCU6YJS","canonical_record":{"source":{"id":"1208.3907","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-08-20T01:06:21Z","cross_cats_sorted":[],"title_canon_sha256":"77aa58c2a0ab43d91b14615ee25c351df0eb6163aa207c9a69c88bb8e718a31a","abstract_canon_sha256":"8270a49bf7622ee945e2f6c79451d8f4a8a0a6b636553531b5899655f3cf5cd3"},"schema_version":"1.0"},"canonical_sha256":"3d054f6132193c24f1e8f53e22498b91ae000698eb5c4bbb42961b9b632a18f7","source":{"kind":"arxiv","id":"1208.3907","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.3907","created_at":"2026-05-18T01:55:09Z"},{"alias_kind":"arxiv_version","alias_value":"1208.3907v1","created_at":"2026-05-18T01:55:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.3907","created_at":"2026-05-18T01:55:09Z"},{"alias_kind":"pith_short_12","alias_value":"HUCU6YJSDE6C","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_16","alias_value":"HUCU6YJSDE6CJ4PI","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_8","alias_value":"HUCU6YJS","created_at":"2026-05-18T12:27:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:HUCU6YJSDE6CJ4PI6U7CESMLSG","target":"record","payload":{"canonical_record":{"source":{"id":"1208.3907","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-08-20T01:06:21Z","cross_cats_sorted":[],"title_canon_sha256":"77aa58c2a0ab43d91b14615ee25c351df0eb6163aa207c9a69c88bb8e718a31a","abstract_canon_sha256":"8270a49bf7622ee945e2f6c79451d8f4a8a0a6b636553531b5899655f3cf5cd3"},"schema_version":"1.0"},"canonical_sha256":"3d054f6132193c24f1e8f53e22498b91ae000698eb5c4bbb42961b9b632a18f7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:55:09.331878Z","signature_b64":"BnTWcii6S2pnIqgfo23a/fIF/og27lvpDgV4Jt70g/oFf9xb3aUcTzWYKuASV3v+KYUM5sdEjUCrJRh/s68ZAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3d054f6132193c24f1e8f53e22498b91ae000698eb5c4bbb42961b9b632a18f7","last_reissued_at":"2026-05-18T01:55:09.331135Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:55:09.331135Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1208.3907","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":"2026-05-18T01:55:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aSGHl+bVLG4xTXOYbPTWVPv0vqEw6Rq8XxOpibrbzsKovTeYmimCFj0ECynHoAXcr/H0H6QSillNhCjdYbEbCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T07:06:00.384871Z"},"content_sha256":"61780d655c07da87eb06f9861eec701e7c59a97ddddfbd3a6d29cd164f4719c6","schema_version":"1.0","event_id":"sha256:61780d655c07da87eb06f9861eec701e7c59a97ddddfbd3a6d29cd164f4719c6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:HUCU6YJSDE6CJ4PI6U7CESMLSG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Can R CrB stars form from the merger of two helium white dwarfs?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"C. Simon Jeffery, Xianfei Zhang","submitted_at":"2012-08-20T01:06:21Z","abstract_excerpt":"Due to orbital decay by gravitational-wave radiation, some close-binary helium white dwarfs are expected to merge within a Hubble time. The immediate merger products are believed to be helium-rich sdO stars, essentially helium main-sequence stars. We present new evolution calculations for these post-merger stars beyond the core helium-burning phase. The most massive He-sdO's develop a strong helium-burning shell and evolve to become helium-rich giants. We include nucleosynthesis calculations following the merger of $0.4 \\rm M_{\\odot}$ helium white-dwarf pairs with metallicities $Z = 0.0001, 0."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.3907","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":"2026-05-18T01:55:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DyS88WpymrhurVzZpK19Iarfx5IwBsFUetPSbYRE6O/iwWptHSDjXQO9sTZQWfQ53aowLxOVElj6LyIjk579Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T07:06:00.385556Z"},"content_sha256":"7dc28605495e3755b286d655670d48b11d744e9b467e1d98bf0aacf5705b3262","schema_version":"1.0","event_id":"sha256:7dc28605495e3755b286d655670d48b11d744e9b467e1d98bf0aacf5705b3262"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HUCU6YJSDE6CJ4PI6U7CESMLSG/bundle.json","state_url":"https://pith.science/pith/HUCU6YJSDE6CJ4PI6U7CESMLSG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HUCU6YJSDE6CJ4PI6U7CESMLSG/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":"2026-05-26T07:06:00Z","links":{"resolver":"https://pith.science/pith/HUCU6YJSDE6CJ4PI6U7CESMLSG","bundle":"https://pith.science/pith/HUCU6YJSDE6CJ4PI6U7CESMLSG/bundle.json","state":"https://pith.science/pith/HUCU6YJSDE6CJ4PI6U7CESMLSG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HUCU6YJSDE6CJ4PI6U7CESMLSG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:HUCU6YJSDE6CJ4PI6U7CESMLSG","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":"8270a49bf7622ee945e2f6c79451d8f4a8a0a6b636553531b5899655f3cf5cd3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-08-20T01:06:21Z","title_canon_sha256":"77aa58c2a0ab43d91b14615ee25c351df0eb6163aa207c9a69c88bb8e718a31a"},"schema_version":"1.0","source":{"id":"1208.3907","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.3907","created_at":"2026-05-18T01:55:09Z"},{"alias_kind":"arxiv_version","alias_value":"1208.3907v1","created_at":"2026-05-18T01:55:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.3907","created_at":"2026-05-18T01:55:09Z"},{"alias_kind":"pith_short_12","alias_value":"HUCU6YJSDE6C","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_16","alias_value":"HUCU6YJSDE6CJ4PI","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_8","alias_value":"HUCU6YJS","created_at":"2026-05-18T12:27:09Z"}],"graph_snapshots":[{"event_id":"sha256:7dc28605495e3755b286d655670d48b11d744e9b467e1d98bf0aacf5705b3262","target":"graph","created_at":"2026-05-18T01:55:09Z","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":"Due to orbital decay by gravitational-wave radiation, some close-binary helium white dwarfs are expected to merge within a Hubble time. The immediate merger products are believed to be helium-rich sdO stars, essentially helium main-sequence stars. We present new evolution calculations for these post-merger stars beyond the core helium-burning phase. The most massive He-sdO's develop a strong helium-burning shell and evolve to become helium-rich giants. We include nucleosynthesis calculations following the merger of $0.4 \\rm M_{\\odot}$ helium white-dwarf pairs with metallicities $Z = 0.0001, 0.","authors_text":"C. Simon Jeffery, Xianfei Zhang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-08-20T01:06:21Z","title":"Can R CrB stars form from the merger of two helium white dwarfs?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.3907","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":"sha256:61780d655c07da87eb06f9861eec701e7c59a97ddddfbd3a6d29cd164f4719c6","target":"record","created_at":"2026-05-18T01:55:09Z","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":"8270a49bf7622ee945e2f6c79451d8f4a8a0a6b636553531b5899655f3cf5cd3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-08-20T01:06:21Z","title_canon_sha256":"77aa58c2a0ab43d91b14615ee25c351df0eb6163aa207c9a69c88bb8e718a31a"},"schema_version":"1.0","source":{"id":"1208.3907","kind":"arxiv","version":1}},"canonical_sha256":"3d054f6132193c24f1e8f53e22498b91ae000698eb5c4bbb42961b9b632a18f7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3d054f6132193c24f1e8f53e22498b91ae000698eb5c4bbb42961b9b632a18f7","first_computed_at":"2026-05-18T01:55:09.331135Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:55:09.331135Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"BnTWcii6S2pnIqgfo23a/fIF/og27lvpDgV4Jt70g/oFf9xb3aUcTzWYKuASV3v+KYUM5sdEjUCrJRh/s68ZAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:55:09.331878Z","signed_message":"canonical_sha256_bytes"},"source_id":"1208.3907","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:61780d655c07da87eb06f9861eec701e7c59a97ddddfbd3a6d29cd164f4719c6","sha256:7dc28605495e3755b286d655670d48b11d744e9b467e1d98bf0aacf5705b3262"],"state_sha256":"cde96814a78afff055a058b2b27cf1144a74966202fa7dc018016dd7f6f2bd9d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SlLcLPNx1Y2Us6E3r20DpunOOUr9wRLk9WYUqk//4dk1utrsN9bCcjDvgpnxcJZoziwrlaoY4+uN2UFCWlK3BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T07:06:00.389326Z","bundle_sha256":"0372d54cef686b32a9dfed805465c7898372011d3f34afe9975189e87118ca2e"}}