{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:2AU3F5GDXOIC3BCBYVCDBW6WJY","short_pith_number":"pith:2AU3F5GD","canonical_record":{"source":{"id":"2107.13675","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-29T00:07:33Z","cross_cats_sorted":[],"title_canon_sha256":"051d1c6d532393dbe9107624182a0af3be5ba6b5b021261034d5c83ab03f21a0","abstract_canon_sha256":"c57c5ca0e1542f8523e2daf6d62e2ce25a28c44874e6a96027b10c76a9035171"},"schema_version":"1.0"},"canonical_sha256":"d029b2f4c3bb902d8441c54430dbd64e110af9c017328cf4a64da34728149bd1","source":{"kind":"arxiv","id":"2107.13675","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.13675","created_at":"2026-07-05T03:06:34Z"},{"alias_kind":"arxiv_version","alias_value":"2107.13675v1","created_at":"2026-07-05T03:06:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.13675","created_at":"2026-07-05T03:06:34Z"},{"alias_kind":"pith_short_12","alias_value":"2AU3F5GDXOIC","created_at":"2026-07-05T03:06:34Z"},{"alias_kind":"pith_short_16","alias_value":"2AU3F5GDXOIC3BCB","created_at":"2026-07-05T03:06:34Z"},{"alias_kind":"pith_short_8","alias_value":"2AU3F5GD","created_at":"2026-07-05T03:06:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:2AU3F5GDXOIC3BCBYVCDBW6WJY","target":"record","payload":{"canonical_record":{"source":{"id":"2107.13675","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-29T00:07:33Z","cross_cats_sorted":[],"title_canon_sha256":"051d1c6d532393dbe9107624182a0af3be5ba6b5b021261034d5c83ab03f21a0","abstract_canon_sha256":"c57c5ca0e1542f8523e2daf6d62e2ce25a28c44874e6a96027b10c76a9035171"},"schema_version":"1.0"},"canonical_sha256":"d029b2f4c3bb902d8441c54430dbd64e110af9c017328cf4a64da34728149bd1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:06:34.129358Z","signature_b64":"9jfFsfzqHSIfAjxe+qh3cAd7dDjp29Cay/RNA4YkdonDkv5VpTxjWJ+0jUq0FN5borPU+mnaP8KYd7FgNNUECw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d029b2f4c3bb902d8441c54430dbd64e110af9c017328cf4a64da34728149bd1","last_reissued_at":"2026-07-05T03:06:34.128943Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:06:34.128943Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2107.13675","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:06:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"P2wbx5IvRTkv9f2sxMxMTa30MxlZzAuWfRazThuFAH2mN1eoJYnZbemEImR9QMaPDA/zjHOOT8OsnL+C5L5aDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T11:59:34.474012Z"},"content_sha256":"d7fdb8f0a0d528780c2ea5b0f2b2e28243e89afc5fbcc430defbd2ee3dd93c62","schema_version":"1.0","event_id":"sha256:d7fdb8f0a0d528780c2ea5b0f2b2e28243e89afc5fbcc430defbd2ee3dd93c62"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:2AU3F5GDXOIC3BCBYVCDBW6WJY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Speckle-Imaging Search for Close Triple Companions of Cataclysmic Binaries","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Anthony F.J. Moffat, Crystal L. Gnilka, David Zurek, Elise Furlan, Michael M. Shara, Nicholas J. Scott, Steve B. Howell","submitted_at":"2021-07-29T00:07:33Z","abstract_excerpt":"The orbital periods of most eclipsing cataclysmic binaries are not undergoing linear secular decreases of order a few parts per billion as expected from simple theory. Instead, they show several parts per million increases and decreases on timescales of years to decades, ascribed to magnetic effects in their donors, triple companions, or both. To directly test the triple companion hypothesis, we carried out a speckle imaging survey of six of the nearest and brightest cataclysmic variables. We found no main sequence companions earlier than spectral types M4V in the separation range 0.02\" - 1.2\""},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.13675","kind":"arxiv","version":1},"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/2107.13675/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":"2026-07-05T03:06:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/28TxYE7Z6ZqM0FfHUEL5nueUs39mD7T2HwoDYN/mjSN9ceCNIFDkrbW3yOKx87nTKR6mKpmxs5bexe2sNM4CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T11:59:34.474396Z"},"content_sha256":"aee87a142b4b3dac97b5dfc3739c49784c74a2d8afb56c9453ccc9d5da4bc586","schema_version":"1.0","event_id":"sha256:aee87a142b4b3dac97b5dfc3739c49784c74a2d8afb56c9453ccc9d5da4bc586"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2AU3F5GDXOIC3BCBYVCDBW6WJY/bundle.json","state_url":"https://pith.science/pith/2AU3F5GDXOIC3BCBYVCDBW6WJY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2AU3F5GDXOIC3BCBYVCDBW6WJY/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":"2026-07-05T11:59:34Z","links":{"resolver":"https://pith.science/pith/2AU3F5GDXOIC3BCBYVCDBW6WJY","bundle":"https://pith.science/pith/2AU3F5GDXOIC3BCBYVCDBW6WJY/bundle.json","state":"https://pith.science/pith/2AU3F5GDXOIC3BCBYVCDBW6WJY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2AU3F5GDXOIC3BCBYVCDBW6WJY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:2AU3F5GDXOIC3BCBYVCDBW6WJY","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":"c57c5ca0e1542f8523e2daf6d62e2ce25a28c44874e6a96027b10c76a9035171","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-29T00:07:33Z","title_canon_sha256":"051d1c6d532393dbe9107624182a0af3be5ba6b5b021261034d5c83ab03f21a0"},"schema_version":"1.0","source":{"id":"2107.13675","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.13675","created_at":"2026-07-05T03:06:34Z"},{"alias_kind":"arxiv_version","alias_value":"2107.13675v1","created_at":"2026-07-05T03:06:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.13675","created_at":"2026-07-05T03:06:34Z"},{"alias_kind":"pith_short_12","alias_value":"2AU3F5GDXOIC","created_at":"2026-07-05T03:06:34Z"},{"alias_kind":"pith_short_16","alias_value":"2AU3F5GDXOIC3BCB","created_at":"2026-07-05T03:06:34Z"},{"alias_kind":"pith_short_8","alias_value":"2AU3F5GD","created_at":"2026-07-05T03:06:34Z"}],"graph_snapshots":[{"event_id":"sha256:aee87a142b4b3dac97b5dfc3739c49784c74a2d8afb56c9453ccc9d5da4bc586","target":"graph","created_at":"2026-07-05T03:06:34Z","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/2107.13675/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The orbital periods of most eclipsing cataclysmic binaries are not undergoing linear secular decreases of order a few parts per billion as expected from simple theory. Instead, they show several parts per million increases and decreases on timescales of years to decades, ascribed to magnetic effects in their donors, triple companions, or both. To directly test the triple companion hypothesis, we carried out a speckle imaging survey of six of the nearest and brightest cataclysmic variables. We found no main sequence companions earlier than spectral types M4V in the separation range 0.02\" - 1.2\"","authors_text":"Anthony F.J. Moffat, Crystal L. Gnilka, David Zurek, Elise Furlan, Michael M. Shara, Nicholas J. Scott, Steve B. Howell","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-29T00:07:33Z","title":"A Speckle-Imaging Search for Close Triple Companions of Cataclysmic Binaries"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.13675","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:d7fdb8f0a0d528780c2ea5b0f2b2e28243e89afc5fbcc430defbd2ee3dd93c62","target":"record","created_at":"2026-07-05T03:06:34Z","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":"c57c5ca0e1542f8523e2daf6d62e2ce25a28c44874e6a96027b10c76a9035171","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-07-29T00:07:33Z","title_canon_sha256":"051d1c6d532393dbe9107624182a0af3be5ba6b5b021261034d5c83ab03f21a0"},"schema_version":"1.0","source":{"id":"2107.13675","kind":"arxiv","version":1}},"canonical_sha256":"d029b2f4c3bb902d8441c54430dbd64e110af9c017328cf4a64da34728149bd1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d029b2f4c3bb902d8441c54430dbd64e110af9c017328cf4a64da34728149bd1","first_computed_at":"2026-07-05T03:06:34.128943Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:06:34.128943Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9jfFsfzqHSIfAjxe+qh3cAd7dDjp29Cay/RNA4YkdonDkv5VpTxjWJ+0jUq0FN5borPU+mnaP8KYd7FgNNUECw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:06:34.129358Z","signed_message":"canonical_sha256_bytes"},"source_id":"2107.13675","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d7fdb8f0a0d528780c2ea5b0f2b2e28243e89afc5fbcc430defbd2ee3dd93c62","sha256:aee87a142b4b3dac97b5dfc3739c49784c74a2d8afb56c9453ccc9d5da4bc586"],"state_sha256":"644c38b5e210a7e85fe7bfbc982beb0d9ad212921fa80966633c3e8ecf503d8e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sQP0Gn3XaxdstV0xOaL+hkuHDoVZbaEah7ATN9LWwrxtoepX7uXjyueESkY4kJHvWjTq2CCHq5jaJ7w3JIMoBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T11:59:34.476447Z","bundle_sha256":"712ab5fcf7c1f546678f40643f79b35645c38af14e0d2f03dd44e4ade815aabc"}}