{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:NE3MSYZBKBDAGP64FGWAKA3EPP","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":"3c080f347f060f8cb774822d6fa9784beb6832aea7902cb21add503b5be4b6e1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-07-08T03:03:47Z","title_canon_sha256":"81afc1a58efc419bdd9bcf32780f88509b10e9a649c461ae98d551d470e69c71"},"schema_version":"1.0","source":{"id":"1407.1937","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.1937","created_at":"2026-05-18T01:29:47Z"},{"alias_kind":"arxiv_version","alias_value":"1407.1937v2","created_at":"2026-05-18T01:29:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.1937","created_at":"2026-05-18T01:29:47Z"},{"alias_kind":"pith_short_12","alias_value":"NE3MSYZBKBDA","created_at":"2026-05-18T12:28:41Z"},{"alias_kind":"pith_short_16","alias_value":"NE3MSYZBKBDAGP64","created_at":"2026-05-18T12:28:41Z"},{"alias_kind":"pith_short_8","alias_value":"NE3MSYZB","created_at":"2026-05-18T12:28:41Z"}],"graph_snapshots":[{"event_id":"sha256:c0aeab6cdddefe8952eaef12f3a963cb129b2c463e49d6f58254c20855397364","target":"graph","created_at":"2026-05-18T01:29:47Z","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":"The X-ray binary 4U 1543$-$624 has been provisionally identified as an ultracompact system with an orbital period of $\\simeq$18~min. We have carried out time-resolved optical imaging of the binary to verify the ultra-short orbital period. Using 140\\,min of high-cadence $r'$-band photometry we recover the previously-seen sinusoidal modulation and determine a period $P=18.20\\pm0.09$\\,min. In addition, we also see a 7.0$\\times 10^{-4}$\\,mag\\,min$^{-1}$ linear decay, likely related to variations in the source's accretion activity. Assuming that the sinusoidal modulation arises from X-ray heating o","authors_text":"A. Tziamtzis (SHAO, China), D. Chakrabarty (Kavli Institute for Astrophysics, D. L. Kaplan (University of Wisconsin-Milwaukee), MIT), Space Research, Z. Wang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-07-08T03:03:47Z","title":"Optical Modulation in the X-Ray Binary 4U 1543-624 Revisited"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.1937","kind":"arxiv","version":2},"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:a08d4c4acf506f59ce621c7bde210bb266f4132d135a459d2cd09268e31740ff","target":"record","created_at":"2026-05-18T01:29:47Z","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":"3c080f347f060f8cb774822d6fa9784beb6832aea7902cb21add503b5be4b6e1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-07-08T03:03:47Z","title_canon_sha256":"81afc1a58efc419bdd9bcf32780f88509b10e9a649c461ae98d551d470e69c71"},"schema_version":"1.0","source":{"id":"1407.1937","kind":"arxiv","version":2}},"canonical_sha256":"6936c963215046033fdc29ac0503647bd4526ea080d11a13a0dd43e409c3fa72","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6936c963215046033fdc29ac0503647bd4526ea080d11a13a0dd43e409c3fa72","first_computed_at":"2026-05-18T01:29:47.004460Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:29:47.004460Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6Sczq7uudtsFMTZSxxm0YpuuyQBJPV9uc1zHkLhB1HdPRcl2mT0TpJgfnc0oZRfcJPdim19cHS+KfFiV8JPEAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:29:47.004881Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.1937","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a08d4c4acf506f59ce621c7bde210bb266f4132d135a459d2cd09268e31740ff","sha256:c0aeab6cdddefe8952eaef12f3a963cb129b2c463e49d6f58254c20855397364"],"state_sha256":"8b96b7256645d0c5c731c043c2ddea3a042a208aa575c87de7d8a22c5fecd8b9"}