{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:7QZMW427LFT7ZNNRUUUTYQGCNU","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":"352c37838127c6a56a7aa25b591b2269669c2b0bf40baf0cd15d529141287507","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-04-03T20:32:45Z","title_canon_sha256":"c69b309dbed63c4f66a36ab7ad284b9eedc8e22f5480a432ffad8cc0c2cf471a"},"schema_version":"1.0","source":{"id":"1304.1180","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.1180","created_at":"2026-05-18T01:50:43Z"},{"alias_kind":"arxiv_version","alias_value":"1304.1180v1","created_at":"2026-05-18T01:50:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.1180","created_at":"2026-05-18T01:50:43Z"},{"alias_kind":"pith_short_12","alias_value":"7QZMW427LFT7","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_16","alias_value":"7QZMW427LFT7ZNNR","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_8","alias_value":"7QZMW427","created_at":"2026-05-18T12:27:36Z"}],"graph_snapshots":[{"event_id":"sha256:c42c02b01e5d02b9f0231de6b7be5ef32dcea16c366c8ed51cca5db80d70d1fc","target":"graph","created_at":"2026-05-18T01:50:43Z","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":"Coronagraphy is a powerful technique to achieve high contrast imaging and hence to image faint companions around bright targets. Various concepts have been used in the visible and near-infrared regimes, while coronagraphic applications in the mid-infrared remain nowadays largely unexplored. Vector vortex phase masks based on concentric subwavelength gratings show great promise for such applications. We aim at producing and validating the first high-performance broadband focal plane phase mask coronagraphs for applications in the mid-infrared regime, and in particular the L band with a fraction","authors_text":"Anthony Boccaletti, Christian Delacroix, Dimitri Mawet, Ismo Vartiainen, Jean Surdej, Markku Kuittinen, Michael Karlsson, Olivier Absil, Pierre Baudoz, Pontus Forsberg, Serge Habraken, Valentin Christiaens","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-04-03T20:32:45Z","title":"Laboratory demonstration of a mid-infrared AGPM vector vortex coronagraph"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.1180","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":"sha256:64f2ab3e3528b758808e9ca5ea567779cb90743a8dea89bb34d7eb5fff20fd0c","target":"record","created_at":"2026-05-18T01:50:43Z","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":"352c37838127c6a56a7aa25b591b2269669c2b0bf40baf0cd15d529141287507","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-04-03T20:32:45Z","title_canon_sha256":"c69b309dbed63c4f66a36ab7ad284b9eedc8e22f5480a432ffad8cc0c2cf471a"},"schema_version":"1.0","source":{"id":"1304.1180","kind":"arxiv","version":1}},"canonical_sha256":"fc32cb735f5967fcb5b1a5293c40c26d1db5f5e8b08584d304947108b5defd8b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fc32cb735f5967fcb5b1a5293c40c26d1db5f5e8b08584d304947108b5defd8b","first_computed_at":"2026-05-18T01:50:43.326657Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:50:43.326657Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xpZ/n2FmbGjQupur5zDw7nkyg40ONpmiDKfdSpcz5ZUMrSmGG5CEQ1y3vsWnME5muV/5XHU4iU1wa3PsoWj8Cw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:50:43.327235Z","signed_message":"canonical_sha256_bytes"},"source_id":"1304.1180","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:64f2ab3e3528b758808e9ca5ea567779cb90743a8dea89bb34d7eb5fff20fd0c","sha256:c42c02b01e5d02b9f0231de6b7be5ef32dcea16c366c8ed51cca5db80d70d1fc"],"state_sha256":"74e9786686098873a651e58178f87a256cffb0fac0d2e18f91e77353aa31532a"}