{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:WLKHKEROOOTWCF6VNZACA7BHVK","short_pith_number":"pith:WLKHKERO","canonical_record":{"source":{"id":"1808.09450","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-08-28T18:00:00Z","cross_cats_sorted":[],"title_canon_sha256":"5945801ee1260bb790cd267a984f410e0adb98f578ef8631b3d5869d26a7a01a","abstract_canon_sha256":"0d3af117d0c42f6a571a4cbf46a9ea8948cb40cc764e45ef02d35f8f006a8dc2"},"schema_version":"1.0"},"canonical_sha256":"b2d475122e73a76117d56e40207c27aaa5c90bb1f48a853fa806b1c7f2fd1863","source":{"kind":"arxiv","id":"1808.09450","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.09450","created_at":"2026-05-17T23:59:51Z"},{"alias_kind":"arxiv_version","alias_value":"1808.09450v3","created_at":"2026-05-17T23:59:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.09450","created_at":"2026-05-17T23:59:51Z"},{"alias_kind":"pith_short_12","alias_value":"WLKHKEROOOTW","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"WLKHKEROOOTWCF6V","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"WLKHKERO","created_at":"2026-05-18T12:33:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:WLKHKEROOOTWCF6VNZACA7BHVK","target":"record","payload":{"canonical_record":{"source":{"id":"1808.09450","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-08-28T18:00:00Z","cross_cats_sorted":[],"title_canon_sha256":"5945801ee1260bb790cd267a984f410e0adb98f578ef8631b3d5869d26a7a01a","abstract_canon_sha256":"0d3af117d0c42f6a571a4cbf46a9ea8948cb40cc764e45ef02d35f8f006a8dc2"},"schema_version":"1.0"},"canonical_sha256":"b2d475122e73a76117d56e40207c27aaa5c90bb1f48a853fa806b1c7f2fd1863","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:59:51.702270Z","signature_b64":"SpBU4RqOg0qmIaOFNy+Mix9qvAEaCN41dbdxfxUQTsUMvah8tCQHv8AeTzoO84pby5zHU3XYPocXDrqUCPtsAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b2d475122e73a76117d56e40207c27aaa5c90bb1f48a853fa806b1c7f2fd1863","last_reissued_at":"2026-05-17T23:59:51.701825Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:59:51.701825Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1808.09450","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:59:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"79tzE9Ai/LF+ZwtgXm/AREoC8p+8XgjBfoe6yp94JhkbHg3gQKkdjU5WvFYCHf5U/eNlpGBYdzIFjgpC1oh/DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T17:50:25.992141Z"},"content_sha256":"503ac7fd617ab55693088b25fede443a3b90372a152d3057ed166d5d551b6721","schema_version":"1.0","event_id":"sha256:503ac7fd617ab55693088b25fede443a3b90372a152d3057ed166d5d551b6721"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:WLKHKEROOOTWCF6VNZACA7BHVK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Magnetic Nature of the Cataclysmic Variable Period Gap","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"C. Garraffo, J. D. Alvarado-Gomez, J. J. Drake, O. Cohen, S. P. Moschou","submitted_at":"2018-08-28T18:00:00Z","abstract_excerpt":"One of the most important problems in the context of cataclysmic variables (CVs) is the lack of observations of systems with periods between 2 and 3.12 hours, known as the period gap. The orbital evolution of CVs with periods shorter than those in the gap is dominated by gravitational radiation while for periods exceeding those of the gap it is dominated by magnetic braking of the secondary star. Spruit & Ritter (1983) showed that as periods approach 3 hours and secondary stars become fully convective a sharp decline in magnetic dynamo and braking efficiency would result in such a gap. Recent "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.09450","kind":"arxiv","version":3},"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":"2026-05-17T23:59:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ReCC9+O6n18QHkBMmv7VWKtfyEHCocQRkNJYzLYAJg54Y57wADKoNP4TUHgEbPulATLDpGrm4r5QqinzvQ3fAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T17:50:25.992503Z"},"content_sha256":"c47c73ccf3585485933f3c2fcbc3a07df2051ffea09e31642db72962e181cfd4","schema_version":"1.0","event_id":"sha256:c47c73ccf3585485933f3c2fcbc3a07df2051ffea09e31642db72962e181cfd4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WLKHKEROOOTWCF6VNZACA7BHVK/bundle.json","state_url":"https://pith.science/pith/WLKHKEROOOTWCF6VNZACA7BHVK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WLKHKEROOOTWCF6VNZACA7BHVK/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":"2026-06-02T17:50:25Z","links":{"resolver":"https://pith.science/pith/WLKHKEROOOTWCF6VNZACA7BHVK","bundle":"https://pith.science/pith/WLKHKEROOOTWCF6VNZACA7BHVK/bundle.json","state":"https://pith.science/pith/WLKHKEROOOTWCF6VNZACA7BHVK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WLKHKEROOOTWCF6VNZACA7BHVK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:WLKHKEROOOTWCF6VNZACA7BHVK","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":"0d3af117d0c42f6a571a4cbf46a9ea8948cb40cc764e45ef02d35f8f006a8dc2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-08-28T18:00:00Z","title_canon_sha256":"5945801ee1260bb790cd267a984f410e0adb98f578ef8631b3d5869d26a7a01a"},"schema_version":"1.0","source":{"id":"1808.09450","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.09450","created_at":"2026-05-17T23:59:51Z"},{"alias_kind":"arxiv_version","alias_value":"1808.09450v3","created_at":"2026-05-17T23:59:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.09450","created_at":"2026-05-17T23:59:51Z"},{"alias_kind":"pith_short_12","alias_value":"WLKHKEROOOTW","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"WLKHKEROOOTWCF6V","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"WLKHKERO","created_at":"2026-05-18T12:33:01Z"}],"graph_snapshots":[{"event_id":"sha256:c47c73ccf3585485933f3c2fcbc3a07df2051ffea09e31642db72962e181cfd4","target":"graph","created_at":"2026-05-17T23:59:51Z","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":"One of the most important problems in the context of cataclysmic variables (CVs) is the lack of observations of systems with periods between 2 and 3.12 hours, known as the period gap. The orbital evolution of CVs with periods shorter than those in the gap is dominated by gravitational radiation while for periods exceeding those of the gap it is dominated by magnetic braking of the secondary star. Spruit & Ritter (1983) showed that as periods approach 3 hours and secondary stars become fully convective a sharp decline in magnetic dynamo and braking efficiency would result in such a gap. Recent ","authors_text":"C. Garraffo, J. D. Alvarado-Gomez, J. J. Drake, O. Cohen, S. P. Moschou","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-08-28T18:00:00Z","title":"The Magnetic Nature of the Cataclysmic Variable Period Gap"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.09450","kind":"arxiv","version":3},"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":"sha256:503ac7fd617ab55693088b25fede443a3b90372a152d3057ed166d5d551b6721","target":"record","created_at":"2026-05-17T23:59:51Z","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":"0d3af117d0c42f6a571a4cbf46a9ea8948cb40cc764e45ef02d35f8f006a8dc2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-08-28T18:00:00Z","title_canon_sha256":"5945801ee1260bb790cd267a984f410e0adb98f578ef8631b3d5869d26a7a01a"},"schema_version":"1.0","source":{"id":"1808.09450","kind":"arxiv","version":3}},"canonical_sha256":"b2d475122e73a76117d56e40207c27aaa5c90bb1f48a853fa806b1c7f2fd1863","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b2d475122e73a76117d56e40207c27aaa5c90bb1f48a853fa806b1c7f2fd1863","first_computed_at":"2026-05-17T23:59:51.701825Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:59:51.701825Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SpBU4RqOg0qmIaOFNy+Mix9qvAEaCN41dbdxfxUQTsUMvah8tCQHv8AeTzoO84pby5zHU3XYPocXDrqUCPtsAA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:59:51.702270Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.09450","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:503ac7fd617ab55693088b25fede443a3b90372a152d3057ed166d5d551b6721","sha256:c47c73ccf3585485933f3c2fcbc3a07df2051ffea09e31642db72962e181cfd4"],"state_sha256":"98d9361af5cc8781913215c4b910cb6106b52aa0814c8a2a73bc8b2a646b5e1b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5i91fdjYE/rn0Djv/klDI7qZi/ymq86YRlnOujFeoPypKSokvUuDL6mbn5CH1DNU6t/6xfC3nuHuhlUrlMFzAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T17:50:25.994466Z","bundle_sha256":"322fa95af03516ec86d8399f1f401b42d11b20b604a4831adbd4771bae43662b"}}