{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:ODYA3TMALELPIE3BYA76A3HKOH","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":"70e843593a70298bd625b80a71692928663536e3b6d20fd0998fbca6d58e33ac","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-09-29T20:19:28Z","title_canon_sha256":"67732e9211a5d6ec9e4c1ecfc94920b9892842a77250e720ebd15ccf5233fd48"},"schema_version":"1.0","source":{"id":"1509.08942","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.08942","created_at":"2026-05-18T01:31:10Z"},{"alias_kind":"arxiv_version","alias_value":"1509.08942v2","created_at":"2026-05-18T01:31:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.08942","created_at":"2026-05-18T01:31:10Z"},{"alias_kind":"pith_short_12","alias_value":"ODYA3TMALELP","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"ODYA3TMALELPIE3B","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"ODYA3TMA","created_at":"2026-05-18T12:29:34Z"}],"graph_snapshots":[{"event_id":"sha256:a21f1ef8da4f012c6a9e051234fa4174c0aa00bcc9225317d2b1c2f075a656f4","target":"graph","created_at":"2026-05-18T01:31:10Z","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":"H1504+65 is an extremely hot white dwarf (effective temperature Teff = 200,000 K) with a carbon-oxygen dominated atmosphere devoid of hydrogen and helium. This atmospheric composition was hitherto unique among hot white dwarfs (WDs), and it could be related to recently detected cooler WDs with C or O dominated spectra. The origin of the H and He deficiency in H1504+65 is unclear. To further assess this problem, we performed ultraviolet spectroscopy with the Cosmic Origins Spectrograph (COS) aboard the Hubble Space Telescope (HST). In accordance with previous far-ultraviolet spectroscopy perfor","authors_text":"K. Werner, T. Rauch","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-09-29T20:19:28Z","title":"Analysis of HST/COS spectra of the bare C-O stellar core H1504+65 and a high-velocity twin in the Galactic halo"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.08942","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":"sha256:974e8d924170c29270bfa1a63406f100c8dde157a90ae4b89bdbb1efb85cf6d7","target":"record","created_at":"2026-05-18T01:31:10Z","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":"70e843593a70298bd625b80a71692928663536e3b6d20fd0998fbca6d58e33ac","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-09-29T20:19:28Z","title_canon_sha256":"67732e9211a5d6ec9e4c1ecfc94920b9892842a77250e720ebd15ccf5233fd48"},"schema_version":"1.0","source":{"id":"1509.08942","kind":"arxiv","version":2}},"canonical_sha256":"70f00dcd805916f41361c03fe06cea71f754bf5708575d7a7631befbf4e15919","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"70f00dcd805916f41361c03fe06cea71f754bf5708575d7a7631befbf4e15919","first_computed_at":"2026-05-18T01:31:10.380238Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:31:10.380238Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"eXL4SpWZ5oDO+7uaYWGhnIftWhKhOjLcnYJRDiUc4Y96hvK1p9DK38YBtxd9gZ5jZ5HCEqhEF90SDu3KIe3kCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:31:10.380906Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.08942","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:974e8d924170c29270bfa1a63406f100c8dde157a90ae4b89bdbb1efb85cf6d7","sha256:a21f1ef8da4f012c6a9e051234fa4174c0aa00bcc9225317d2b1c2f075a656f4"],"state_sha256":"e6a503519eec4b9c6628a399e58c9b7ba19c86a1730617ed11c3b86fb31ed293"}