{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:LZ3IFM4777MPKYAMUUGWLTJWNV","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":"2db3b17a2e9f4bce4aab2be71d8494058edc67fa63fcd578af3fa9c16d4ef3ca","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-05-15T19:41:34Z","title_canon_sha256":"13607ceaaf34b795988537cad3fca8b4f2d8d94a3ef25a09e096a07df69aa69c"},"schema_version":"1.0","source":{"id":"1105.2961","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1105.2961","created_at":"2026-05-18T02:01:58Z"},{"alias_kind":"arxiv_version","alias_value":"1105.2961v1","created_at":"2026-05-18T02:01:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1105.2961","created_at":"2026-05-18T02:01:58Z"},{"alias_kind":"pith_short_12","alias_value":"LZ3IFM4777MP","created_at":"2026-05-18T12:26:34Z"},{"alias_kind":"pith_short_16","alias_value":"LZ3IFM4777MPKYAM","created_at":"2026-05-18T12:26:34Z"},{"alias_kind":"pith_short_8","alias_value":"LZ3IFM47","created_at":"2026-05-18T12:26:34Z"}],"graph_snapshots":[{"event_id":"sha256:00a8ddc99dd96f038e7a5c02fa6a8a8c6f3d24f46184db5f0c68a7e5f377aa91","target":"graph","created_at":"2026-05-18T02:01:58Z","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":"Imaging polarimetry is a powerful tool for detecting and characterizing exoplanets and circumstellar environments. Polarimetry allows a separation of the light coming from an unpolarized source such as a star and the polarized source such as a planet or a protoplanetary disk. Future facilities like SPHERE at the VLT or EPICS at the E-ELT will incorporate imaging polarimetry to detect exoplanets. The Extreme Polarimeter (ExPo) is a dual-beam imaging polarimeter that currently can reach contrast ratios of 10^5, enough to characterize circumstellar environments. We present the data reduction step","authors_text":"C. U. Keller, H. Canovas, M. Min, M. Rodenhuis, S. V. Jeffers","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-05-15T19:41:34Z","title":"Data Reduction Techniques for High Contrast Imaging Polarimetry. Applications to ExPo"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1105.2961","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":"sha256:3105d589347b6c62818ded6114b609f5761a42e7499b879f818f39423daaa42d","target":"record","created_at":"2026-05-18T02:01:58Z","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":"2db3b17a2e9f4bce4aab2be71d8494058edc67fa63fcd578af3fa9c16d4ef3ca","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-05-15T19:41:34Z","title_canon_sha256":"13607ceaaf34b795988537cad3fca8b4f2d8d94a3ef25a09e096a07df69aa69c"},"schema_version":"1.0","source":{"id":"1105.2961","kind":"arxiv","version":1}},"canonical_sha256":"5e7682b39fffd8f5600ca50d65cd366d51e202e6d76987c68b736e90e9a8ad31","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5e7682b39fffd8f5600ca50d65cd366d51e202e6d76987c68b736e90e9a8ad31","first_computed_at":"2026-05-18T02:01:58.169919Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:01:58.169919Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DeettdPXD9jveR/dcPJQH4GmqUXlp9d8bpc5d3Hx5ZLIsLoJnqYMNGmDegfFp3fhpa6JNjZUo+BEeWysjgaBAw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:01:58.170486Z","signed_message":"canonical_sha256_bytes"},"source_id":"1105.2961","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3105d589347b6c62818ded6114b609f5761a42e7499b879f818f39423daaa42d","sha256:00a8ddc99dd96f038e7a5c02fa6a8a8c6f3d24f46184db5f0c68a7e5f377aa91"],"state_sha256":"c7434158b4c441b215761771a85a41a8bd4052316ae7a13c3e21ae52dc184894"}