{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:FIODLJO7HSWPALAN2SQBOG6OT2","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":"af02d78ba62794026980c065be5ee7a04ecd050720c257ee094fad54cc8d7e56","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-09-07T21:38:31Z","title_canon_sha256":"a7b0748215b49d60c04ec6559f1ce9ce0f66944ca6feedd284e849bd8db2b856"},"schema_version":"1.0","source":{"id":"1709.02459","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.02459","created_at":"2026-05-18T00:35:45Z"},{"alias_kind":"arxiv_version","alias_value":"1709.02459v1","created_at":"2026-05-18T00:35:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.02459","created_at":"2026-05-18T00:35:45Z"},{"alias_kind":"pith_short_12","alias_value":"FIODLJO7HSWP","created_at":"2026-05-18T12:31:15Z"},{"alias_kind":"pith_short_16","alias_value":"FIODLJO7HSWPALAN","created_at":"2026-05-18T12:31:15Z"},{"alias_kind":"pith_short_8","alias_value":"FIODLJO7","created_at":"2026-05-18T12:31:15Z"}],"graph_snapshots":[{"event_id":"sha256:b4816c7a3429d429a5e8370e84727e1ed58307e1fd766253d08ecc32dc88e125","target":"graph","created_at":"2026-05-18T00:35:45Z","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 EXoplanetary Circumstellar Environments and Disk Explorer (EXCEDE) science mission concept uses a visible-wavelength Phase-Induced Amplitude Apodization (PIAA) coronagraph to enable high-contrast imaging of circumstellar debris systems and some giant planets at angular separations reaching into the habitable zones of some of the nearest stars. We report on the experimental results obtained in the vacuum chamber at the Lockheed Martin Advanced Technology Center in 10% broadband light centered about 650 nm, with a median contrast of $1 \\times 10^{-5}$ between 1.2 and 2.0 $\\lambda$/D simultan","authors_text":"Dana H. Lynch, Dan Sirbu, Eduardo Bendek, Eugene Pluzhnik, Glenn Schneider, Julien Lozi, Olivier Guyon, Peter Zell, Ruslan Belikov, Sandrine J. Thomas, Troy Hix","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-09-07T21:38:31Z","title":"Demonstration of broadband contrast at 1.2 $\\lambda$/D and greater for the EXCEDE Starlight Suppression System"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.02459","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":"sha256:8ed619edd91d7d6ad66aff8528882ee6891d90596957a0c1ae89edf7233dc64f","target":"record","created_at":"2026-05-18T00:35:45Z","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":"af02d78ba62794026980c065be5ee7a04ecd050720c257ee094fad54cc8d7e56","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-09-07T21:38:31Z","title_canon_sha256":"a7b0748215b49d60c04ec6559f1ce9ce0f66944ca6feedd284e849bd8db2b856"},"schema_version":"1.0","source":{"id":"1709.02459","kind":"arxiv","version":1}},"canonical_sha256":"2a1c35a5df3cacf02c0dd4a0171bce9eb546d989c13e22fb1e0cdb643d8e93d2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2a1c35a5df3cacf02c0dd4a0171bce9eb546d989c13e22fb1e0cdb643d8e93d2","first_computed_at":"2026-05-18T00:35:45.735214Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:35:45.735214Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zSwHdGUqS171K5nEW4j14fJ4lpFWhN97KHGMN6jHDCzCwfISWPyWgTbeC60zC774rF3+9pchlKP8VZVCqsJTAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:35:45.735705Z","signed_message":"canonical_sha256_bytes"},"source_id":"1709.02459","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8ed619edd91d7d6ad66aff8528882ee6891d90596957a0c1ae89edf7233dc64f","sha256:b4816c7a3429d429a5e8370e84727e1ed58307e1fd766253d08ecc32dc88e125"],"state_sha256":"cd2b6df318cfb0592af36889736775fa97200874f75f5959e2ed48f1dc02d855"}