{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:YNEHJOYQ6ROVIN54GKKDVAA4MU","short_pith_number":"pith:YNEHJOYQ","canonical_record":{"source":{"id":"2412.03664","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-12-04T19:00:37Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"6aedb2acac1cc0129824c4bac26e34db1a410fbcd05719f10f398f8aa8831b92","abstract_canon_sha256":"a68510b9ad78f66c4bf9ea84f8548f51f87eb79ae2dafebe0cf2dc66c500c522"},"schema_version":"1.0"},"canonical_sha256":"c34874bb10f45d5437bc32943a801c653312275be5fa4f2c8e9697136b7df353","source":{"kind":"arxiv","id":"2412.03664","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2412.03664","created_at":"2026-07-05T11:20:48Z"},{"alias_kind":"arxiv_version","alias_value":"2412.03664v2","created_at":"2026-07-05T11:20:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2412.03664","created_at":"2026-07-05T11:20:48Z"},{"alias_kind":"pith_short_12","alias_value":"YNEHJOYQ6ROV","created_at":"2026-07-05T11:20:48Z"},{"alias_kind":"pith_short_16","alias_value":"YNEHJOYQ6ROVIN54","created_at":"2026-07-05T11:20:48Z"},{"alias_kind":"pith_short_8","alias_value":"YNEHJOYQ","created_at":"2026-07-05T11:20:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:YNEHJOYQ6ROVIN54GKKDVAA4MU","target":"record","payload":{"canonical_record":{"source":{"id":"2412.03664","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-12-04T19:00:37Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"6aedb2acac1cc0129824c4bac26e34db1a410fbcd05719f10f398f8aa8831b92","abstract_canon_sha256":"a68510b9ad78f66c4bf9ea84f8548f51f87eb79ae2dafebe0cf2dc66c500c522"},"schema_version":"1.0"},"canonical_sha256":"c34874bb10f45d5437bc32943a801c653312275be5fa4f2c8e9697136b7df353","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:20:48.647573Z","signature_b64":"YX8sI0fzeF8hiZNObialjBhkmt4T4izxWcvzBBSF2d6c0rHS0hGt3CU2kDpXdPc6FfOGnRUceZOxWx+x865IBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c34874bb10f45d5437bc32943a801c653312275be5fa4f2c8e9697136b7df353","last_reissued_at":"2026-07-05T11:20:48.647038Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:20:48.647038Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2412.03664","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":"2026-07-05T11:20:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VGya9tgxUtPwnyaWhqcvamrhxz5lsExY8C9L/hp3COHNKz3algwfbKFFV69pKhbbpjOkKmaxII24pZ5qLgu/Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T04:10:27.132975Z"},"content_sha256":"b5962ba93b37cd3393e32abe935774856dc2ecbb86dd8ed20138d1aa0afa4d47","schema_version":"1.0","event_id":"sha256:b5962ba93b37cd3393e32abe935774856dc2ecbb86dd8ed20138d1aa0afa4d47"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:YNEHJOYQ6ROVIN54GKKDVAA4MU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Oxygen Isotope Ratios in Hydrogen-Deficient Carbon Stars: A Correlation with Effective Temperature and Implications for White Dwarf Merger Outcomes","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"(2) Division of Physics, (3) Sorbonne Universit\\'es, (4) Sydney Institute for Astronomy (SIfA), (5) Space Science Institute, (6) Research School of Astronomy, Advait Mehla (1), Astronomy, Astrophysics, Australian National University), California Institute of Technology, Courtney Crawford (4), Geoffrey Clayton (5), Indian Institute of Technology Bombay, Jamie Soon (6), Mansi M. Kasliwal (2), Mathematics, Patrick Tisserand (3), School of Physics, University of Sydney, UPMC Univ. Paris 6 et CNRS, Varun Bhalerao (1) ((1) Department of Physics, Viraj Karambelkar (2)","submitted_at":"2024-12-04T19:00:37Z","abstract_excerpt":"Hydrogen-deficient Carbon (HdC) stars are a class of supergiants with anomalous chemical compositions, suggesting that they are remnants of CO-He white dwarf (WD) mergers. This class comprises two spectroscopically similar subclasses - dusty R Coronae Borealis (RCB) and dustless Hydrogen-deficient Carbon (dLHdC) stars. Both subclasses have a stark overabundance of $^{18}\\textrm{O}$ in their atmospheres, but spectroscopic differences between them remain poorly studied. We present high-resolution ($R \\approx 75000$) K-band spectra of six RCB and six dLHdC stars, including four newly discovered d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2412.03664","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2412.03664/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T11:20:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DQaiMQBzFhzL0xAKPlZoeAfkSRugLKzCV5fvfBgIMpST4gCmYH2R5R6eFHNoyMUIgJuU8veCxzf1+QdQ1aY0Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T04:10:27.133499Z"},"content_sha256":"64e33b778d828dfd0c36c9c8f601be30ec247f6efb66e62b289686cf7aabe2bf","schema_version":"1.0","event_id":"sha256:64e33b778d828dfd0c36c9c8f601be30ec247f6efb66e62b289686cf7aabe2bf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YNEHJOYQ6ROVIN54GKKDVAA4MU/bundle.json","state_url":"https://pith.science/pith/YNEHJOYQ6ROVIN54GKKDVAA4MU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YNEHJOYQ6ROVIN54GKKDVAA4MU/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":"2026-08-06T04:10:27Z","links":{"resolver":"https://pith.science/pith/YNEHJOYQ6ROVIN54GKKDVAA4MU","bundle":"https://pith.science/pith/YNEHJOYQ6ROVIN54GKKDVAA4MU/bundle.json","state":"https://pith.science/pith/YNEHJOYQ6ROVIN54GKKDVAA4MU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YNEHJOYQ6ROVIN54GKKDVAA4MU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:YNEHJOYQ6ROVIN54GKKDVAA4MU","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":"a68510b9ad78f66c4bf9ea84f8548f51f87eb79ae2dafebe0cf2dc66c500c522","cross_cats_sorted":["astro-ph.GA"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-12-04T19:00:37Z","title_canon_sha256":"6aedb2acac1cc0129824c4bac26e34db1a410fbcd05719f10f398f8aa8831b92"},"schema_version":"1.0","source":{"id":"2412.03664","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2412.03664","created_at":"2026-07-05T11:20:48Z"},{"alias_kind":"arxiv_version","alias_value":"2412.03664v2","created_at":"2026-07-05T11:20:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2412.03664","created_at":"2026-07-05T11:20:48Z"},{"alias_kind":"pith_short_12","alias_value":"YNEHJOYQ6ROV","created_at":"2026-07-05T11:20:48Z"},{"alias_kind":"pith_short_16","alias_value":"YNEHJOYQ6ROVIN54","created_at":"2026-07-05T11:20:48Z"},{"alias_kind":"pith_short_8","alias_value":"YNEHJOYQ","created_at":"2026-07-05T11:20:48Z"}],"graph_snapshots":[{"event_id":"sha256:64e33b778d828dfd0c36c9c8f601be30ec247f6efb66e62b289686cf7aabe2bf","target":"graph","created_at":"2026-07-05T11:20:48Z","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/2412.03664/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Hydrogen-deficient Carbon (HdC) stars are a class of supergiants with anomalous chemical compositions, suggesting that they are remnants of CO-He white dwarf (WD) mergers. This class comprises two spectroscopically similar subclasses - dusty R Coronae Borealis (RCB) and dustless Hydrogen-deficient Carbon (dLHdC) stars. Both subclasses have a stark overabundance of $^{18}\\textrm{O}$ in their atmospheres, but spectroscopic differences between them remain poorly studied. We present high-resolution ($R \\approx 75000$) K-band spectra of six RCB and six dLHdC stars, including four newly discovered d","authors_text":"(2) Division of Physics, (3) Sorbonne Universit\\'es, (4) Sydney Institute for Astronomy (SIfA), (5) Space Science Institute, (6) Research School of Astronomy, Advait Mehla (1), Astronomy, Astrophysics, Australian National University), California Institute of Technology, Courtney Crawford (4), Geoffrey Clayton (5), Indian Institute of Technology Bombay, Jamie Soon (6), Mansi M. Kasliwal (2), Mathematics, Patrick Tisserand (3), School of Physics, University of Sydney, UPMC Univ. Paris 6 et CNRS, Varun Bhalerao (1) ((1) Department of Physics, Viraj Karambelkar (2)","cross_cats":["astro-ph.GA"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-12-04T19:00:37Z","title":"Oxygen Isotope Ratios in Hydrogen-Deficient Carbon Stars: A Correlation with Effective Temperature and Implications for White Dwarf Merger Outcomes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2412.03664","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:b5962ba93b37cd3393e32abe935774856dc2ecbb86dd8ed20138d1aa0afa4d47","target":"record","created_at":"2026-07-05T11:20:48Z","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":"a68510b9ad78f66c4bf9ea84f8548f51f87eb79ae2dafebe0cf2dc66c500c522","cross_cats_sorted":["astro-ph.GA"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-12-04T19:00:37Z","title_canon_sha256":"6aedb2acac1cc0129824c4bac26e34db1a410fbcd05719f10f398f8aa8831b92"},"schema_version":"1.0","source":{"id":"2412.03664","kind":"arxiv","version":2}},"canonical_sha256":"c34874bb10f45d5437bc32943a801c653312275be5fa4f2c8e9697136b7df353","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c34874bb10f45d5437bc32943a801c653312275be5fa4f2c8e9697136b7df353","first_computed_at":"2026-07-05T11:20:48.647038Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:20:48.647038Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YX8sI0fzeF8hiZNObialjBhkmt4T4izxWcvzBBSF2d6c0rHS0hGt3CU2kDpXdPc6FfOGnRUceZOxWx+x865IBw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:20:48.647573Z","signed_message":"canonical_sha256_bytes"},"source_id":"2412.03664","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b5962ba93b37cd3393e32abe935774856dc2ecbb86dd8ed20138d1aa0afa4d47","sha256:64e33b778d828dfd0c36c9c8f601be30ec247f6efb66e62b289686cf7aabe2bf"],"state_sha256":"3c9f495f5036f7c322f0818c72e2dcd44bd8a92f5858e82ab8690a2b92854db9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MBhc7eqChPoQ0jV6CkRcBzmrEvx+XAXe2sT03c0wNRqWuEWK4wIXWJx0vtMAora5MTM2AKioLih4wIHczKoEAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T04:10:27.141323Z","bundle_sha256":"367cfb6fbc64a04ca94c6051a370a12155e2a6c414e3696c1e2a1448a63b7229"}}