{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:G5I7PWBBVWMV5AYZUI5XQGMBW5","short_pith_number":"pith:G5I7PWBB","canonical_record":{"source":{"id":"1005.3958","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-21T13:43:05Z","cross_cats_sorted":[],"title_canon_sha256":"531a584fda48fbc28f59b25e657c0262a185c7c761534d5bf868831032115c6b","abstract_canon_sha256":"c802bb592cf9355d2af3ea809d4b36e4614c0e0c43187791a1840fadef9fab71"},"schema_version":"1.0"},"canonical_sha256":"3751f7d821ad995e8319a23b781981b752b55a42afd9cf56bd40ddd951f88a40","source":{"kind":"arxiv","id":"1005.3958","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1005.3958","created_at":"2026-05-18T04:07:52Z"},{"alias_kind":"arxiv_version","alias_value":"1005.3958v1","created_at":"2026-05-18T04:07:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1005.3958","created_at":"2026-05-18T04:07:52Z"},{"alias_kind":"pith_short_12","alias_value":"G5I7PWBBVWMV","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_16","alias_value":"G5I7PWBBVWMV5AYZ","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_8","alias_value":"G5I7PWBB","created_at":"2026-05-18T12:26:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:G5I7PWBBVWMV5AYZUI5XQGMBW5","target":"record","payload":{"canonical_record":{"source":{"id":"1005.3958","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-21T13:43:05Z","cross_cats_sorted":[],"title_canon_sha256":"531a584fda48fbc28f59b25e657c0262a185c7c761534d5bf868831032115c6b","abstract_canon_sha256":"c802bb592cf9355d2af3ea809d4b36e4614c0e0c43187791a1840fadef9fab71"},"schema_version":"1.0"},"canonical_sha256":"3751f7d821ad995e8319a23b781981b752b55a42afd9cf56bd40ddd951f88a40","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:07:52.760049Z","signature_b64":"tgMRDpcGgogm6EHoPXRKURuxWp0Zk+sjrUFaGkGU6Bd5P8uy9sGsW1LR4gfJtIYW9PVrVBWepLAdDcDLzF8KDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3751f7d821ad995e8319a23b781981b752b55a42afd9cf56bd40ddd951f88a40","last_reissued_at":"2026-05-18T04:07:52.759497Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:07:52.759497Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1005.3958","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":"2026-05-18T04:07:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WiZ59ktEDyUuIOF3yg6h9NVpKJ7Cc7uAZ0KvDoGbPyXcoN91HMGIlPQ/3W1md53e4zLjz+lNmSUDN4tG/TWjDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T08:25:00.451698Z"},"content_sha256":"2281200548153b2900fb086f3cef3b3af4f89abb83995f0177ba5b564c34b46c","schema_version":"1.0","event_id":"sha256:2281200548153b2900fb086f3cef3b3af4f89abb83995f0177ba5b564c34b46c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:G5I7PWBBVWMV5AYZUI5XQGMBW5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Orbital Period Variations in Eclipsing Post Common Envelope Binaries","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"B. T. G\\\"ansicke, C. M. Copperwheat, E. Unda-Sanzana, J. P. Colque, L. A. G. Monard, N. Barraza, N.S\\'anchez, P. F. L. Maxted, R. D. G. Hickman, S. G. Parsons, S. P. Littlefair, T. R. Marsh, V. S. Dhillon","submitted_at":"2010-05-21T13:43:05Z","abstract_excerpt":"We present high speed ULTRACAM photometry of the eclipsing post common envelope binaries DE CVn, GK Vir, NN Ser, QS Vir, RR Cae, RX J2130.6+4710, SDSS 0110+1326 and SDSS 0303+0054 and use these data to measure precise mid-eclipse times in order to detect any period variations. We detect a large (~ 250 sec) departure from linearity in the eclipse times of QS Vir which Applegate's mechanism fails to reproduce by an order of magnitude. The only mechanism able to drive this period change is a third body in a highly elliptical orbit. However, the planetary/sub-stellar companion previously suggested"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1005.3958","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":""},"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":"2026-05-18T04:07:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"crLJZnJM5/5lEL/hP/Z7XlIDD/L12HcaZXs7LKOumgARZoKchC6tj1MO1wrdW9pSlhbyDW5NYRWP4SI2DR/4Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T08:25:00.452192Z"},"content_sha256":"310e2f55282f4113f9626198246fb1e67d1dfa3a60804d65186dddf04077de1a","schema_version":"1.0","event_id":"sha256:310e2f55282f4113f9626198246fb1e67d1dfa3a60804d65186dddf04077de1a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G5I7PWBBVWMV5AYZUI5XQGMBW5/bundle.json","state_url":"https://pith.science/pith/G5I7PWBBVWMV5AYZUI5XQGMBW5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G5I7PWBBVWMV5AYZUI5XQGMBW5/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":"2026-05-31T08:25:00Z","links":{"resolver":"https://pith.science/pith/G5I7PWBBVWMV5AYZUI5XQGMBW5","bundle":"https://pith.science/pith/G5I7PWBBVWMV5AYZUI5XQGMBW5/bundle.json","state":"https://pith.science/pith/G5I7PWBBVWMV5AYZUI5XQGMBW5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G5I7PWBBVWMV5AYZUI5XQGMBW5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:G5I7PWBBVWMV5AYZUI5XQGMBW5","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":"c802bb592cf9355d2af3ea809d4b36e4614c0e0c43187791a1840fadef9fab71","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-21T13:43:05Z","title_canon_sha256":"531a584fda48fbc28f59b25e657c0262a185c7c761534d5bf868831032115c6b"},"schema_version":"1.0","source":{"id":"1005.3958","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1005.3958","created_at":"2026-05-18T04:07:52Z"},{"alias_kind":"arxiv_version","alias_value":"1005.3958v1","created_at":"2026-05-18T04:07:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1005.3958","created_at":"2026-05-18T04:07:52Z"},{"alias_kind":"pith_short_12","alias_value":"G5I7PWBBVWMV","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_16","alias_value":"G5I7PWBBVWMV5AYZ","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_8","alias_value":"G5I7PWBB","created_at":"2026-05-18T12:26:07Z"}],"graph_snapshots":[{"event_id":"sha256:310e2f55282f4113f9626198246fb1e67d1dfa3a60804d65186dddf04077de1a","target":"graph","created_at":"2026-05-18T04:07:52Z","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 present high speed ULTRACAM photometry of the eclipsing post common envelope binaries DE CVn, GK Vir, NN Ser, QS Vir, RR Cae, RX J2130.6+4710, SDSS 0110+1326 and SDSS 0303+0054 and use these data to measure precise mid-eclipse times in order to detect any period variations. We detect a large (~ 250 sec) departure from linearity in the eclipse times of QS Vir which Applegate's mechanism fails to reproduce by an order of magnitude. The only mechanism able to drive this period change is a third body in a highly elliptical orbit. However, the planetary/sub-stellar companion previously suggested","authors_text":"B. T. G\\\"ansicke, C. M. Copperwheat, E. Unda-Sanzana, J. P. Colque, L. A. G. Monard, N. Barraza, N.S\\'anchez, P. F. L. Maxted, R. D. G. Hickman, S. G. Parsons, S. P. Littlefair, T. R. Marsh, V. S. Dhillon","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-21T13:43:05Z","title":"Orbital Period Variations in Eclipsing Post Common Envelope Binaries"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1005.3958","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":"sha256:2281200548153b2900fb086f3cef3b3af4f89abb83995f0177ba5b564c34b46c","target":"record","created_at":"2026-05-18T04:07:52Z","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":"c802bb592cf9355d2af3ea809d4b36e4614c0e0c43187791a1840fadef9fab71","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-21T13:43:05Z","title_canon_sha256":"531a584fda48fbc28f59b25e657c0262a185c7c761534d5bf868831032115c6b"},"schema_version":"1.0","source":{"id":"1005.3958","kind":"arxiv","version":1}},"canonical_sha256":"3751f7d821ad995e8319a23b781981b752b55a42afd9cf56bd40ddd951f88a40","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3751f7d821ad995e8319a23b781981b752b55a42afd9cf56bd40ddd951f88a40","first_computed_at":"2026-05-18T04:07:52.759497Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:07:52.759497Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tgMRDpcGgogm6EHoPXRKURuxWp0Zk+sjrUFaGkGU6Bd5P8uy9sGsW1LR4gfJtIYW9PVrVBWepLAdDcDLzF8KDA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:07:52.760049Z","signed_message":"canonical_sha256_bytes"},"source_id":"1005.3958","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2281200548153b2900fb086f3cef3b3af4f89abb83995f0177ba5b564c34b46c","sha256:310e2f55282f4113f9626198246fb1e67d1dfa3a60804d65186dddf04077de1a"],"state_sha256":"40d07606150c7cef3bd4cc8ea57497d156bcc29df5088e9d90932238c0be6629"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZnktbeYMUakX8eIl5QfbBuReoFUFprAddplRiSaIhfAQTaaU/cM0k4+lqCjVjV2NViBqYEvoJGk3zpEJ73rCCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T08:25:00.454619Z","bundle_sha256":"4b8335a6dfa7c32faaac85c7d788c6eb49aae13b600d61b4f7ceb9f33fe3d75f"}}