{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:OK7YXQVILA3KLAX2NDWHAHWCOC","short_pith_number":"pith:OK7YXQVI","canonical_record":{"source":{"id":"1901.01925","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-01-07T17:13:04Z","cross_cats_sorted":[],"title_canon_sha256":"cb39fb724731d7669df17c7332dea057e917923d53fc7fe69d6e2eface992713","abstract_canon_sha256":"f6a6cb51ecf1d80c1c54fa206b70dbb669b35c3b837f05277439102d46f3c6d9"},"schema_version":"1.0"},"canonical_sha256":"72bf8bc2a85836a582fa68ec701ec2709112e2fc0c83928d6cc71aac4d3401fb","source":{"kind":"arxiv","id":"1901.01925","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.01925","created_at":"2026-05-17T23:56:44Z"},{"alias_kind":"arxiv_version","alias_value":"1901.01925v1","created_at":"2026-05-17T23:56:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.01925","created_at":"2026-05-17T23:56:44Z"},{"alias_kind":"pith_short_12","alias_value":"OK7YXQVILA3K","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"OK7YXQVILA3KLAX2","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"OK7YXQVI","created_at":"2026-05-18T12:33:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:OK7YXQVILA3KLAX2NDWHAHWCOC","target":"record","payload":{"canonical_record":{"source":{"id":"1901.01925","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-01-07T17:13:04Z","cross_cats_sorted":[],"title_canon_sha256":"cb39fb724731d7669df17c7332dea057e917923d53fc7fe69d6e2eface992713","abstract_canon_sha256":"f6a6cb51ecf1d80c1c54fa206b70dbb669b35c3b837f05277439102d46f3c6d9"},"schema_version":"1.0"},"canonical_sha256":"72bf8bc2a85836a582fa68ec701ec2709112e2fc0c83928d6cc71aac4d3401fb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:56:44.290757Z","signature_b64":"sbitnlWELqpYJs3opPe+tt2juTH2v6Yqbld+ofrvhXEgzcM7OEPhTqiAT2J1uE6ceq0uVx7CoeFDPLK+BpdODQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"72bf8bc2a85836a582fa68ec701ec2709112e2fc0c83928d6cc71aac4d3401fb","last_reissued_at":"2026-05-17T23:56:44.290038Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:56:44.290038Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.01925","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":"2026-05-17T23:56:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nzyhP/lMGAMTqtEnhNfXs7gFvfPpJ9E8gMtN4yAI+EoLThzbyKhCEumNrikJW795xP/vJhr15vUjYaD1U+kyCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T13:38:37.010528Z"},"content_sha256":"e5ec06372b0318918a846e7ee371d1b49331b24348d485405cd3fd3dcccae304","schema_version":"1.0","event_id":"sha256:e5ec06372b0318918a846e7ee371d1b49331b24348d485405cd3fd3dcccae304"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:OK7YXQVILA3KLAX2NDWHAHWCOC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Long-term Spot Stability in the Post-common-envelope Binary QS Vir","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Ahmed Essam, Amal S. Hamed, Attila Cs\\'eki, Gojko Djura\\v{s}evi\\'c, Olivera Latkovi\\'c, Shahenaz M. Youssef","submitted_at":"2019-01-07T17:13:04Z","abstract_excerpt":"We observed the post-common-envelope eclipsing binary with a white dwarf component, QS Vir, using the 1.88 m telescope of Kotammia Observatory in Egypt. The new observations were analyzed together with all multicolor light curves available online (sampling a period of 25 yr), using a full-feature binary system modeling software based on Roche geometry. This is the first time complete photometric modeling was done with most of these data. QS Vir is a detached system, with the red dwarf component underfilling its Roche lobe by a small margin. All light curves feature out-of-eclipse variability t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.01925","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":"2026-05-17T23:56:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qauxj1k22/w3Ud1XhVo4m8xe7O3l1ymqIBdDlwuzjP8x12PWpPQxpyNiyxHpwXzQ8H7JsRYECgw1EH+ub7bjBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T13:38:37.011153Z"},"content_sha256":"b48c26020fc8e5b0b641ae6eac113a243b3bf863a0c24340218daa47a13e6c0c","schema_version":"1.0","event_id":"sha256:b48c26020fc8e5b0b641ae6eac113a243b3bf863a0c24340218daa47a13e6c0c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OK7YXQVILA3KLAX2NDWHAHWCOC/bundle.json","state_url":"https://pith.science/pith/OK7YXQVILA3KLAX2NDWHAHWCOC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OK7YXQVILA3KLAX2NDWHAHWCOC/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":"2026-06-05T13:38:37Z","links":{"resolver":"https://pith.science/pith/OK7YXQVILA3KLAX2NDWHAHWCOC","bundle":"https://pith.science/pith/OK7YXQVILA3KLAX2NDWHAHWCOC/bundle.json","state":"https://pith.science/pith/OK7YXQVILA3KLAX2NDWHAHWCOC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OK7YXQVILA3KLAX2NDWHAHWCOC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:OK7YXQVILA3KLAX2NDWHAHWCOC","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":"f6a6cb51ecf1d80c1c54fa206b70dbb669b35c3b837f05277439102d46f3c6d9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-01-07T17:13:04Z","title_canon_sha256":"cb39fb724731d7669df17c7332dea057e917923d53fc7fe69d6e2eface992713"},"schema_version":"1.0","source":{"id":"1901.01925","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.01925","created_at":"2026-05-17T23:56:44Z"},{"alias_kind":"arxiv_version","alias_value":"1901.01925v1","created_at":"2026-05-17T23:56:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.01925","created_at":"2026-05-17T23:56:44Z"},{"alias_kind":"pith_short_12","alias_value":"OK7YXQVILA3K","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"OK7YXQVILA3KLAX2","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"OK7YXQVI","created_at":"2026-05-18T12:33:24Z"}],"graph_snapshots":[{"event_id":"sha256:b48c26020fc8e5b0b641ae6eac113a243b3bf863a0c24340218daa47a13e6c0c","target":"graph","created_at":"2026-05-17T23:56:44Z","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 observed the post-common-envelope eclipsing binary with a white dwarf component, QS Vir, using the 1.88 m telescope of Kotammia Observatory in Egypt. The new observations were analyzed together with all multicolor light curves available online (sampling a period of 25 yr), using a full-feature binary system modeling software based on Roche geometry. This is the first time complete photometric modeling was done with most of these data. QS Vir is a detached system, with the red dwarf component underfilling its Roche lobe by a small margin. All light curves feature out-of-eclipse variability t","authors_text":"Ahmed Essam, Amal S. Hamed, Attila Cs\\'eki, Gojko Djura\\v{s}evi\\'c, Olivera Latkovi\\'c, Shahenaz M. Youssef","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-01-07T17:13:04Z","title":"Long-term Spot Stability in the Post-common-envelope Binary QS Vir"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.01925","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:e5ec06372b0318918a846e7ee371d1b49331b24348d485405cd3fd3dcccae304","target":"record","created_at":"2026-05-17T23:56:44Z","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":"f6a6cb51ecf1d80c1c54fa206b70dbb669b35c3b837f05277439102d46f3c6d9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-01-07T17:13:04Z","title_canon_sha256":"cb39fb724731d7669df17c7332dea057e917923d53fc7fe69d6e2eface992713"},"schema_version":"1.0","source":{"id":"1901.01925","kind":"arxiv","version":1}},"canonical_sha256":"72bf8bc2a85836a582fa68ec701ec2709112e2fc0c83928d6cc71aac4d3401fb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"72bf8bc2a85836a582fa68ec701ec2709112e2fc0c83928d6cc71aac4d3401fb","first_computed_at":"2026-05-17T23:56:44.290038Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:56:44.290038Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sbitnlWELqpYJs3opPe+tt2juTH2v6Yqbld+ofrvhXEgzcM7OEPhTqiAT2J1uE6ceq0uVx7CoeFDPLK+BpdODQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:56:44.290757Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.01925","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e5ec06372b0318918a846e7ee371d1b49331b24348d485405cd3fd3dcccae304","sha256:b48c26020fc8e5b0b641ae6eac113a243b3bf863a0c24340218daa47a13e6c0c"],"state_sha256":"0a017d0dfd5e441832aa194a2dc4f19c4934cfe1313364bc8691919339e1cea1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"W+PE6ja6LHpEmIsqf4+NDf8qj+qiflapAUfvgpFElkQ2S+8R0tWSm0eBcmm3q8q68PFVpkG+V2DnaPw+y9CeBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T13:38:37.014295Z","bundle_sha256":"8542565d07adf6efbce53a0b6939cbc331bff7afb201fbab1e2a7911c0147fd8"}}