{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:UYR3XAG6SGLF44RHII427JVZVV","short_pith_number":"pith:UYR3XAG6","schema_version":"1.0","canonical_sha256":"a623bb80de91965e72274239afa6b9ad47233aced01cdeffca90f6a468c26850","source":{"kind":"arxiv","id":"2606.04159","version":1},"attestation_state":"computed","paper":{"title":"Predictions for the X-ray polarisation modulation in Cygnus X-1 from reflection off the stellar companion and its wind","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Bert Vander Meulen, Henric Krawczynski, Kun Hu, Victoria Grinberg","submitted_at":"2026-06-02T19:23:34Z","abstract_excerpt":"Context. Cyg X-1 is one of the brightest X-ray binaries and has been observed multiple times with the Imaging X-ray Polarimetry Explorer (IXPE). Recent studies report tentative evidence for a polarisation modulation with the orbital period P, but a half-period (P/2) signal, expected from reflection off the companion star and its stellar wind, has not been reported. Aims. We aim to quantify the reflection-induced variations of the polarisation degree PD and polarisation angle PA in Cyg X-1 as a function of orbital phase and energy, and interpret these in terms of binary geometry and wind struct"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2606.04159","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-02T19:23:34Z","cross_cats_sorted":[],"title_canon_sha256":"b868799912ad2df507370b2d9278bd955e1dece6a3dcde54c4b520c198b98db1","abstract_canon_sha256":"599e3be58a683400345d6af6b026a2dedacffaa297412ebcf671841616cf8d8d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-04T01:08:18.214988Z","signature_b64":"ujBAXizhPLDO7DE4XLgy84A8ByompcexiICQU9MFGYUhZRrOVk5nyYAUc3LfdghNfRXl6LbsShvC6TXl1ITLBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a623bb80de91965e72274239afa6b9ad47233aced01cdeffca90f6a468c26850","last_reissued_at":"2026-06-04T01:08:18.213910Z","signature_status":"signed_v1","first_computed_at":"2026-06-04T01:08:18.213910Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Predictions for the X-ray polarisation modulation in Cygnus X-1 from reflection off the stellar companion and its wind","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Bert Vander Meulen, Henric Krawczynski, Kun Hu, Victoria Grinberg","submitted_at":"2026-06-02T19:23:34Z","abstract_excerpt":"Context. Cyg X-1 is one of the brightest X-ray binaries and has been observed multiple times with the Imaging X-ray Polarimetry Explorer (IXPE). Recent studies report tentative evidence for a polarisation modulation with the orbital period P, but a half-period (P/2) signal, expected from reflection off the companion star and its stellar wind, has not been reported. Aims. We aim to quantify the reflection-induced variations of the polarisation degree PD and polarisation angle PA in Cyg X-1 as a function of orbital phase and energy, and interpret these in terms of binary geometry and wind struct"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.04159","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/2606.04159/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2606.04159","created_at":"2026-06-04T01:08:18.214052+00:00"},{"alias_kind":"arxiv_version","alias_value":"2606.04159v1","created_at":"2026-06-04T01:08:18.214052+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.04159","created_at":"2026-06-04T01:08:18.214052+00:00"},{"alias_kind":"pith_short_12","alias_value":"UYR3XAG6SGLF","created_at":"2026-06-04T01:08:18.214052+00:00"},{"alias_kind":"pith_short_16","alias_value":"UYR3XAG6SGLF44RH","created_at":"2026-06-04T01:08:18.214052+00:00"},{"alias_kind":"pith_short_8","alias_value":"UYR3XAG6","created_at":"2026-06-04T01:08:18.214052+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/UYR3XAG6SGLF44RHII427JVZVV","json":"https://pith.science/pith/UYR3XAG6SGLF44RHII427JVZVV.json","graph_json":"https://pith.science/api/pith-number/UYR3XAG6SGLF44RHII427JVZVV/graph.json","events_json":"https://pith.science/api/pith-number/UYR3XAG6SGLF44RHII427JVZVV/events.json","paper":"https://pith.science/paper/UYR3XAG6"},"agent_actions":{"view_html":"https://pith.science/pith/UYR3XAG6SGLF44RHII427JVZVV","download_json":"https://pith.science/pith/UYR3XAG6SGLF44RHII427JVZVV.json","view_paper":"https://pith.science/paper/UYR3XAG6","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2606.04159&json=true","fetch_graph":"https://pith.science/api/pith-number/UYR3XAG6SGLF44RHII427JVZVV/graph.json","fetch_events":"https://pith.science/api/pith-number/UYR3XAG6SGLF44RHII427JVZVV/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/UYR3XAG6SGLF44RHII427JVZVV/action/timestamp_anchor","attest_storage":"https://pith.science/pith/UYR3XAG6SGLF44RHII427JVZVV/action/storage_attestation","attest_author":"https://pith.science/pith/UYR3XAG6SGLF44RHII427JVZVV/action/author_attestation","sign_citation":"https://pith.science/pith/UYR3XAG6SGLF44RHII427JVZVV/action/citation_signature","submit_replication":"https://pith.science/pith/UYR3XAG6SGLF44RHII427JVZVV/action/replication_record"}},"created_at":"2026-06-04T01:08:18.214052+00:00","updated_at":"2026-06-04T01:08:18.214052+00:00"}