{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:XEX4AFDI36PDL26X7MQ7XERN7G","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":"abbbec637eab71703f8aa1b9acb680a4794d53f9cedbd6421aa3e1aafea89267","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-07-30T09:04:04Z","title_canon_sha256":"4a2dfa22a2bfa24cd83fcdcdcacebba4e4c654d85c4d4a0a557f8d0c1729a110"},"schema_version":"1.0","source":{"id":"1807.11242","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.11242","created_at":"2026-07-05T04:21:42Z"},{"alias_kind":"arxiv_version","alias_value":"1807.11242v1","created_at":"2026-07-05T04:21:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.11242","created_at":"2026-07-05T04:21:42Z"},{"alias_kind":"pith_short_12","alias_value":"XEX4AFDI36PD","created_at":"2026-07-05T04:21:42Z"},{"alias_kind":"pith_short_16","alias_value":"XEX4AFDI36PDL26X","created_at":"2026-07-05T04:21:42Z"},{"alias_kind":"pith_short_8","alias_value":"XEX4AFDI","created_at":"2026-07-05T04:21:42Z"}],"graph_snapshots":[{"event_id":"sha256:c5a6d5a93cc2b7adee0c3cdbfea3ac78e73a36f60fbf629944e84dd6ad8b8f67","target":"graph","created_at":"2026-07-05T04:21:42Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1807.11242/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Phase apodization coronagraphs are implemented in a pupil plane to create a dark hole in the science camera focal plane. They are successfully created as \"Apodizing Phase Plates\" (APPs) using classical optical manufacturing, and as \"vector-APPs\" using liquid-crystal patterning with essentially achromatic performance. This type of coronagraph currently delivers excellent broadband contrast ($\\sim$10$^{-5}$) at small angular separations (few $\\lambda/D$) at ground-based telescopes, owing to their insensitivity to tip/tilt errors.","authors_text":"Frans Snik, Johanan L. Codona, Matthew A. Kenworthy","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-07-30T09:04:04Z","title":"Pupil Plane Phase Apodization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.11242","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":"sha256:3baeeb5ead7d9737247f791219b0a31bd8adff75c3b92d359b493a36907b838a","target":"record","created_at":"2026-07-05T04:21:42Z","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":"abbbec637eab71703f8aa1b9acb680a4794d53f9cedbd6421aa3e1aafea89267","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-07-30T09:04:04Z","title_canon_sha256":"4a2dfa22a2bfa24cd83fcdcdcacebba4e4c654d85c4d4a0a557f8d0c1729a110"},"schema_version":"1.0","source":{"id":"1807.11242","kind":"arxiv","version":1}},"canonical_sha256":"b92fc01468df9e35ebd7fb21fb922df984b77ef154fbc3f17a67c686c58df7b7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b92fc01468df9e35ebd7fb21fb922df984b77ef154fbc3f17a67c686c58df7b7","first_computed_at":"2026-07-05T04:21:42.948839Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:21:42.948839Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JAl8nkHgi9m3Iq3JTdV1Agf0yHrixZlqD1oPk5/VgLZef2PjzUDTXcThtOxIieQ75agoVFxjwigRHwcr5+ZCAg==","signature_status":"signed_v1","signed_at":"2026-07-05T04:21:42.949368Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.11242","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3baeeb5ead7d9737247f791219b0a31bd8adff75c3b92d359b493a36907b838a","sha256:c5a6d5a93cc2b7adee0c3cdbfea3ac78e73a36f60fbf629944e84dd6ad8b8f67"],"state_sha256":"1d1e8509bdd935df6364daeafcd7890809bbdb9650959c099edfc9783c53ef73"}