{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:YFU4DHR5HPP62RBLSCJ67NYL7Y","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":"95f2e8fe38ca1d5a6fd45248ab05faf23eebb548d05e0aceeb5eb304e10545de","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-05-31T09:52:00Z","title_canon_sha256":"fa096d30410f14692f2fbd194cff1a3699d627001ac457b4d49eddf0447e8cc2"},"schema_version":"1.0","source":{"id":"1105.6227","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1105.6227","created_at":"2026-05-18T02:01:45Z"},{"alias_kind":"arxiv_version","alias_value":"1105.6227v1","created_at":"2026-05-18T02:01:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1105.6227","created_at":"2026-05-18T02:01:45Z"},{"alias_kind":"pith_short_12","alias_value":"YFU4DHR5HPP6","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_16","alias_value":"YFU4DHR5HPP62RBL","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_8","alias_value":"YFU4DHR5","created_at":"2026-05-18T12:26:47Z"}],"graph_snapshots":[{"event_id":"sha256:bc32ffe9fda2dbdad1704a590865fb820f250c0b4dbccabcfdeddcbbfd439359","target":"graph","created_at":"2026-05-18T02:01:45Z","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":"We report the results of XMM-Newton observations of HD49798/RXJ0648.0-4418, the only known X-ray binary consisting of a hot sub-dwarf and a white dwarf. The white dwarf rotates very rapidly (P=13.2 s) and has a dynamically measured mass of 1.28+/-0.05 M_sun. Its X-ray emission consists of a strongly pulsed, soft component, well fit by a blackbody with kT~40 eV, accounting for most of the luminosity, and a fainter hard power-law component (photon index ~1.6). A luminosity of ~10^{32} erg/s is produced by accretion onto the white dwarf of the helium-rich matter from the wind of the companion, wh","authors_text":"(2) INAF-OA Cagliari, (3) University of Cape Town, (4) INAF-OA ROMA, A.Tiengo (1), F.Pizzolato (1), G.L.Israel (4), Italy, Italy), L.Stella (4) ((1) INAF-IASF MILANO, N.La Palombara (1), P.A.Woudt (3), P.Esposito (2), S.Mereghetti (1), South Africa","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-05-31T09:52:00Z","title":"X-ray and optical observations of the unique binary system HD49798/RXJ0648.0-4418"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1105.6227","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":"sha256:2c90c994c1d654f9529a162d46cbff299b814eba5758ff07e2001544379a3227","target":"record","created_at":"2026-05-18T02:01:45Z","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":"95f2e8fe38ca1d5a6fd45248ab05faf23eebb548d05e0aceeb5eb304e10545de","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-05-31T09:52:00Z","title_canon_sha256":"fa096d30410f14692f2fbd194cff1a3699d627001ac457b4d49eddf0447e8cc2"},"schema_version":"1.0","source":{"id":"1105.6227","kind":"arxiv","version":1}},"canonical_sha256":"c169c19e3d3bdfed442b9093efb70bfe3daf5a209cb5510b7fe83fa0a561cc15","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c169c19e3d3bdfed442b9093efb70bfe3daf5a209cb5510b7fe83fa0a561cc15","first_computed_at":"2026-05-18T02:01:45.616446Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:01:45.616446Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5bWuxOMRxnDrCrA3nZYjNy2p1jY4V9Qdpp7WSZFkZv0hrFvaogIrIycUYWXpntzIIQ5KqzPcDj4uKjpuxTt2Aw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:01:45.617300Z","signed_message":"canonical_sha256_bytes"},"source_id":"1105.6227","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2c90c994c1d654f9529a162d46cbff299b814eba5758ff07e2001544379a3227","sha256:bc32ffe9fda2dbdad1704a590865fb820f250c0b4dbccabcfdeddcbbfd439359"],"state_sha256":"ee614dc6144d55614be48f72ee256ac8f2282ebd737ee4e4bc0ed9fa3acb4b10"}