{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:LPFL2IAJVPY6NU462LGCFCBORC","short_pith_number":"pith:LPFL2IAJ","canonical_record":{"source":{"id":"1503.05197","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-03-17T20:00:18Z","cross_cats_sorted":[],"title_canon_sha256":"3813f5b7afc2d8d0448804d9a973b4d876643610a9d12eed53717e3e0835dc3f","abstract_canon_sha256":"131a87716c0c5db1267e00c3460da8625609c32d46025c43e6d05558c9a92a8a"},"schema_version":"1.0"},"canonical_sha256":"5bcabd2009abf1e6d39ed2cc22882e8894339b07e51868292e4e82a7da9d85a6","source":{"kind":"arxiv","id":"1503.05197","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1503.05197","created_at":"2026-05-18T02:04:06Z"},{"alias_kind":"arxiv_version","alias_value":"1503.05197v2","created_at":"2026-05-18T02:04:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.05197","created_at":"2026-05-18T02:04:06Z"},{"alias_kind":"pith_short_12","alias_value":"LPFL2IAJVPY6","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"LPFL2IAJVPY6NU46","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"LPFL2IAJ","created_at":"2026-05-18T12:29:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:LPFL2IAJVPY6NU462LGCFCBORC","target":"record","payload":{"canonical_record":{"source":{"id":"1503.05197","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-03-17T20:00:18Z","cross_cats_sorted":[],"title_canon_sha256":"3813f5b7afc2d8d0448804d9a973b4d876643610a9d12eed53717e3e0835dc3f","abstract_canon_sha256":"131a87716c0c5db1267e00c3460da8625609c32d46025c43e6d05558c9a92a8a"},"schema_version":"1.0"},"canonical_sha256":"5bcabd2009abf1e6d39ed2cc22882e8894339b07e51868292e4e82a7da9d85a6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:04:06.010994Z","signature_b64":"ubI3GIbCeCyw/kGMNuwpsQ/N6eyqFKl+2DhPkMJZHAo8hj82qrQpMYU5XWR2h1P3yl2s3rs1W2BFLFAGGct9DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5bcabd2009abf1e6d39ed2cc22882e8894339b07e51868292e4e82a7da9d85a6","last_reissued_at":"2026-05-18T02:04:06.010262Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:04:06.010262Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1503.05197","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":"2026-05-18T02:04:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KIQ/yOMaG5VI5nLBzoGUdX/gZ5b7T1y6TF8pRbGHqIAXO7y8Vp37gbyt7zT5yzZxrEPeazg36XYY+0e0riyICQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T23:28:49.831187Z"},"content_sha256":"c29224ef02705d6d535e7b059879859d84c92f3ad0b7e013a204efe0708e5923","schema_version":"1.0","event_id":"sha256:c29224ef02705d6d535e7b059879859d84c92f3ad0b7e013a204efe0708e5923"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:LPFL2IAJVPY6NU462LGCFCBORC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"White dwarf masses in cataclysmic variables","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"M.R. Schreiber, M. Zorotovic, T.P.G. Wijnen","submitted_at":"2015-03-17T20:00:18Z","abstract_excerpt":"The white dwarf (WD) mass distribution of cataclysmic variables (CVs) has recently been found to dramatically disagree with the predictions of the standard CV formation model. The high mean WD mass among CVs is not imprinted in the currently observed sample of CV progenitors and cannot be attributed to selection effects. Two possibilities have been put forward: either the WD grows in mass during CV evolution, or in a significant fraction of cases, CV formation is preceded by a (short) phase of thermal time-scale mass transfer (TTMT) in which the WD gains a sufficient amount of mass. We investi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.05197","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":""},"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":"2026-05-18T02:04:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"feuJjiPxFB8lvOjZlfIkp4O1kO1Jf9BwlU/QqKMZPJryS0GsHRXpIznFqSKB12DmhglRBN4He0oncGH8s05nBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T23:28:49.831542Z"},"content_sha256":"2bb16058e66ae2e7520506e25ed53bc21624cb98673e9e385b7eadd93ae78e95","schema_version":"1.0","event_id":"sha256:2bb16058e66ae2e7520506e25ed53bc21624cb98673e9e385b7eadd93ae78e95"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LPFL2IAJVPY6NU462LGCFCBORC/bundle.json","state_url":"https://pith.science/pith/LPFL2IAJVPY6NU462LGCFCBORC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LPFL2IAJVPY6NU462LGCFCBORC/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":"2026-06-08T23:28:49Z","links":{"resolver":"https://pith.science/pith/LPFL2IAJVPY6NU462LGCFCBORC","bundle":"https://pith.science/pith/LPFL2IAJVPY6NU462LGCFCBORC/bundle.json","state":"https://pith.science/pith/LPFL2IAJVPY6NU462LGCFCBORC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LPFL2IAJVPY6NU462LGCFCBORC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:LPFL2IAJVPY6NU462LGCFCBORC","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":"131a87716c0c5db1267e00c3460da8625609c32d46025c43e6d05558c9a92a8a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-03-17T20:00:18Z","title_canon_sha256":"3813f5b7afc2d8d0448804d9a973b4d876643610a9d12eed53717e3e0835dc3f"},"schema_version":"1.0","source":{"id":"1503.05197","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1503.05197","created_at":"2026-05-18T02:04:06Z"},{"alias_kind":"arxiv_version","alias_value":"1503.05197v2","created_at":"2026-05-18T02:04:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.05197","created_at":"2026-05-18T02:04:06Z"},{"alias_kind":"pith_short_12","alias_value":"LPFL2IAJVPY6","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"LPFL2IAJVPY6NU46","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"LPFL2IAJ","created_at":"2026-05-18T12:29:29Z"}],"graph_snapshots":[{"event_id":"sha256:2bb16058e66ae2e7520506e25ed53bc21624cb98673e9e385b7eadd93ae78e95","target":"graph","created_at":"2026-05-18T02:04:06Z","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":"The white dwarf (WD) mass distribution of cataclysmic variables (CVs) has recently been found to dramatically disagree with the predictions of the standard CV formation model. The high mean WD mass among CVs is not imprinted in the currently observed sample of CV progenitors and cannot be attributed to selection effects. Two possibilities have been put forward: either the WD grows in mass during CV evolution, or in a significant fraction of cases, CV formation is preceded by a (short) phase of thermal time-scale mass transfer (TTMT) in which the WD gains a sufficient amount of mass. We investi","authors_text":"M.R. Schreiber, M. Zorotovic, T.P.G. Wijnen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-03-17T20:00:18Z","title":"White dwarf masses in cataclysmic variables"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.05197","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:c29224ef02705d6d535e7b059879859d84c92f3ad0b7e013a204efe0708e5923","target":"record","created_at":"2026-05-18T02:04:06Z","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":"131a87716c0c5db1267e00c3460da8625609c32d46025c43e6d05558c9a92a8a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-03-17T20:00:18Z","title_canon_sha256":"3813f5b7afc2d8d0448804d9a973b4d876643610a9d12eed53717e3e0835dc3f"},"schema_version":"1.0","source":{"id":"1503.05197","kind":"arxiv","version":2}},"canonical_sha256":"5bcabd2009abf1e6d39ed2cc22882e8894339b07e51868292e4e82a7da9d85a6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5bcabd2009abf1e6d39ed2cc22882e8894339b07e51868292e4e82a7da9d85a6","first_computed_at":"2026-05-18T02:04:06.010262Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:04:06.010262Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ubI3GIbCeCyw/kGMNuwpsQ/N6eyqFKl+2DhPkMJZHAo8hj82qrQpMYU5XWR2h1P3yl2s3rs1W2BFLFAGGct9DA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:04:06.010994Z","signed_message":"canonical_sha256_bytes"},"source_id":"1503.05197","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c29224ef02705d6d535e7b059879859d84c92f3ad0b7e013a204efe0708e5923","sha256:2bb16058e66ae2e7520506e25ed53bc21624cb98673e9e385b7eadd93ae78e95"],"state_sha256":"f7f5e3a475028aa2f2ecbe3a7f194728a3ed536e013104c81ed4d9d310dcc297"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PWg8n0cCE3W9QIzKbxxDG7osx3Y2HSE30L3lYsK84QPEWCHWXR6L8QGwMWW9Z8G0U2HhIexHxuoLGCFFVA1HBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T23:28:49.833392Z","bundle_sha256":"0f9b6f178086e49212cce4e6493c9b68d358cba88cbaaa6eb60d4decf436f63d"}}