{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:XIKYJ3SAHHVXHBQHSLLPUQ7XYN","short_pith_number":"pith:XIKYJ3SA","schema_version":"1.0","canonical_sha256":"ba1584ee4039eb73860792d6fa43f7c377c193f08545556223d6374e08442f84","source":{"kind":"arxiv","id":"2606.30894","version":1},"attestation_state":"computed","paper":{"title":"Energy-Resolved Limits on Orbital X-ray Polarization Modulation in Cygnus X-1","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, Sohee Chun","submitted_at":"2026-06-29T20:32:49Z","abstract_excerpt":"Reflection off the companion star and its focused stellar wind is predicted to modulate the X-ray polarization of black hole X-ray binaries at half the orbital period ($P_{\\rm orb}/2$), with an energy-dependent amplitude. We test this prediction against all publicly available IXPE observations of Cygnus X-1, comprising 26 one-day bins from 12 observation IDs spanning 2022-2024. Since the normalized Stokes parameters correlate linearly with the spectral hardness ratio in all three energy bands (2-4, 4-6, and 6-8 keV), we employ a simultaneous harmonic regression that decouples spectral variabil"},"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":"2606.30894","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-29T20:32:49Z","cross_cats_sorted":[],"title_canon_sha256":"768fdb32dfa37676d8b4e55d23686728e063e13feddf9d86a253e45b2f5c9597","abstract_canon_sha256":"f6301dee528d5870dc9791c05e539647a787f0d4fa5192adbc2514d5c0343b03"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-01T00:17:20.721685Z","signature_b64":"mxMfifaHiIZT/Y0eOvpIrRB2IGfQYjLIlayohjkBMO/yJ2jYhV2ZcLOPdwFbUIh78f+keoNP1wpBBjF+gY+ZCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ba1584ee4039eb73860792d6fa43f7c377c193f08545556223d6374e08442f84","last_reissued_at":"2026-07-01T00:17:20.721261Z","signature_status":"signed_v1","first_computed_at":"2026-07-01T00:17:20.721261Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Energy-Resolved Limits on Orbital X-ray Polarization Modulation in Cygnus X-1","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, Sohee Chun","submitted_at":"2026-06-29T20:32:49Z","abstract_excerpt":"Reflection off the companion star and its focused stellar wind is predicted to modulate the X-ray polarization of black hole X-ray binaries at half the orbital period ($P_{\\rm orb}/2$), with an energy-dependent amplitude. We test this prediction against all publicly available IXPE observations of Cygnus X-1, comprising 26 one-day bins from 12 observation IDs spanning 2022-2024. Since the normalized Stokes parameters correlate linearly with the spectral hardness ratio in all three energy bands (2-4, 4-6, and 6-8 keV), we employ a simultaneous harmonic regression that decouples spectral variabil"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.30894","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/2606.30894/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":"2606.30894","created_at":"2026-07-01T00:17:20.721319+00:00"},{"alias_kind":"arxiv_version","alias_value":"2606.30894v1","created_at":"2026-07-01T00:17:20.721319+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.30894","created_at":"2026-07-01T00:17:20.721319+00:00"},{"alias_kind":"pith_short_12","alias_value":"XIKYJ3SAHHVX","created_at":"2026-07-01T00:17:20.721319+00:00"},{"alias_kind":"pith_short_16","alias_value":"XIKYJ3SAHHVXHBQH","created_at":"2026-07-01T00:17:20.721319+00:00"},{"alias_kind":"pith_short_8","alias_value":"XIKYJ3SA","created_at":"2026-07-01T00:17:20.721319+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/XIKYJ3SAHHVXHBQHSLLPUQ7XYN","json":"https://pith.science/pith/XIKYJ3SAHHVXHBQHSLLPUQ7XYN.json","graph_json":"https://pith.science/api/pith-number/XIKYJ3SAHHVXHBQHSLLPUQ7XYN/graph.json","events_json":"https://pith.science/api/pith-number/XIKYJ3SAHHVXHBQHSLLPUQ7XYN/events.json","paper":"https://pith.science/paper/XIKYJ3SA"},"agent_actions":{"view_html":"https://pith.science/pith/XIKYJ3SAHHVXHBQHSLLPUQ7XYN","download_json":"https://pith.science/pith/XIKYJ3SAHHVXHBQHSLLPUQ7XYN.json","view_paper":"https://pith.science/paper/XIKYJ3SA","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2606.30894&json=true","fetch_graph":"https://pith.science/api/pith-number/XIKYJ3SAHHVXHBQHSLLPUQ7XYN/graph.json","fetch_events":"https://pith.science/api/pith-number/XIKYJ3SAHHVXHBQHSLLPUQ7XYN/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/XIKYJ3SAHHVXHBQHSLLPUQ7XYN/action/timestamp_anchor","attest_storage":"https://pith.science/pith/XIKYJ3SAHHVXHBQHSLLPUQ7XYN/action/storage_attestation","attest_author":"https://pith.science/pith/XIKYJ3SAHHVXHBQHSLLPUQ7XYN/action/author_attestation","sign_citation":"https://pith.science/pith/XIKYJ3SAHHVXHBQHSLLPUQ7XYN/action/citation_signature","submit_replication":"https://pith.science/pith/XIKYJ3SAHHVXHBQHSLLPUQ7XYN/action/replication_record"}},"created_at":"2026-07-01T00:17:20.721319+00:00","updated_at":"2026-07-01T00:17:20.721319+00:00"}