{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:AVQWAR3D3Y5YCHHOJ5U4MN6IDJ","short_pith_number":"pith:AVQWAR3D","canonical_record":{"source":{"id":"1705.04699","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-05-12T18:01:46Z","cross_cats_sorted":[],"title_canon_sha256":"ea09a67cc32554dde033686ec776d2e4e6e119eb8dfeb801e3830f2bcd8147c2","abstract_canon_sha256":"98e1eed3de19b885b76ded7d6bef97ca7634d709ea45694afd9e360333d017c0"},"schema_version":"1.0"},"canonical_sha256":"0561604763de3b811cee4f69c637c81a54e55da2eb3584f11f76851ce4942472","source":{"kind":"arxiv","id":"1705.04699","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.04699","created_at":"2026-05-18T00:44:34Z"},{"alias_kind":"arxiv_version","alias_value":"1705.04699v1","created_at":"2026-05-18T00:44:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.04699","created_at":"2026-05-18T00:44:34Z"},{"alias_kind":"pith_short_12","alias_value":"AVQWAR3D3Y5Y","created_at":"2026-05-18T12:31:08Z"},{"alias_kind":"pith_short_16","alias_value":"AVQWAR3D3Y5YCHHO","created_at":"2026-05-18T12:31:08Z"},{"alias_kind":"pith_short_8","alias_value":"AVQWAR3D","created_at":"2026-05-18T12:31:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:AVQWAR3D3Y5YCHHOJ5U4MN6IDJ","target":"record","payload":{"canonical_record":{"source":{"id":"1705.04699","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-05-12T18:01:46Z","cross_cats_sorted":[],"title_canon_sha256":"ea09a67cc32554dde033686ec776d2e4e6e119eb8dfeb801e3830f2bcd8147c2","abstract_canon_sha256":"98e1eed3de19b885b76ded7d6bef97ca7634d709ea45694afd9e360333d017c0"},"schema_version":"1.0"},"canonical_sha256":"0561604763de3b811cee4f69c637c81a54e55da2eb3584f11f76851ce4942472","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:44:34.879686Z","signature_b64":"CLZTkuhnxowLSJF7ZYkncBipxZ066O1Bcuu9d1jE2zlMPufSodmhJAZAd6NCki72gkXtEuqZGz3Wg3k/wADGAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0561604763de3b811cee4f69c637c81a54e55da2eb3584f11f76851ce4942472","last_reissued_at":"2026-05-18T00:44:34.879072Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:44:34.879072Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1705.04699","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:44:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"a/+4wq+Y+riGdfH/8+gRu4+UtznX2Q3pWuHYd2MWS1zZTwuzQ+sIzfWMdvox5K41zDjJycpcjrAyf+L2jxXaCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T03:25:31.351052Z"},"content_sha256":"12a971ce55a643cf204159730fe6cf87d2c4f9c09e15dfd01495a490bc4b2512","schema_version":"1.0","event_id":"sha256:12a971ce55a643cf204159730fe6cf87d2c4f9c09e15dfd01495a490bc4b2512"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:AVQWAR3D3Y5YCHHOJ5U4MN6IDJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"High-contrast imaging at small separation: impact of the optical configuration of two deformable mirrors on dark holes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"C. Gouvret, F. Vakili, L. Abe, M. Beaulieu, P. Baudoz, P. Martinez","submitted_at":"2017-05-12T18:01:46Z","abstract_excerpt":"The direct detection and characterization of exoplanets will be a major scientific driver over the next decade, involving the development of very large telescopes and requires high-contrast imaging close to the optical axis. Some complex techniques have been developed to improve the performance at small separations (coronagraphy, wavefront shaping, etc). In this paper, we study some of the fundamental limitations of high contrast at the instrument design level, for cases that use a combination of a coronagraph and two deformable mirrors for wavefront shaping. In particular, we focus on small-s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.04699","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:44:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XmE+dmwkiHGzBSiWp0Vp4y9wzb3hYeb9aVlg47foDDqlecF+vIkbvPA80m5HHi/5GcLLyYkwWUeqE0F8y838DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T03:25:31.351810Z"},"content_sha256":"4b705006a48bf6b8b7965514648d96e060b5ca7b18906fc5e35bd70539fc9967","schema_version":"1.0","event_id":"sha256:4b705006a48bf6b8b7965514648d96e060b5ca7b18906fc5e35bd70539fc9967"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AVQWAR3D3Y5YCHHOJ5U4MN6IDJ/bundle.json","state_url":"https://pith.science/pith/AVQWAR3D3Y5YCHHOJ5U4MN6IDJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AVQWAR3D3Y5YCHHOJ5U4MN6IDJ/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-24T03:25:31Z","links":{"resolver":"https://pith.science/pith/AVQWAR3D3Y5YCHHOJ5U4MN6IDJ","bundle":"https://pith.science/pith/AVQWAR3D3Y5YCHHOJ5U4MN6IDJ/bundle.json","state":"https://pith.science/pith/AVQWAR3D3Y5YCHHOJ5U4MN6IDJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AVQWAR3D3Y5YCHHOJ5U4MN6IDJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:AVQWAR3D3Y5YCHHOJ5U4MN6IDJ","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":"98e1eed3de19b885b76ded7d6bef97ca7634d709ea45694afd9e360333d017c0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-05-12T18:01:46Z","title_canon_sha256":"ea09a67cc32554dde033686ec776d2e4e6e119eb8dfeb801e3830f2bcd8147c2"},"schema_version":"1.0","source":{"id":"1705.04699","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.04699","created_at":"2026-05-18T00:44:34Z"},{"alias_kind":"arxiv_version","alias_value":"1705.04699v1","created_at":"2026-05-18T00:44:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.04699","created_at":"2026-05-18T00:44:34Z"},{"alias_kind":"pith_short_12","alias_value":"AVQWAR3D3Y5Y","created_at":"2026-05-18T12:31:08Z"},{"alias_kind":"pith_short_16","alias_value":"AVQWAR3D3Y5YCHHO","created_at":"2026-05-18T12:31:08Z"},{"alias_kind":"pith_short_8","alias_value":"AVQWAR3D","created_at":"2026-05-18T12:31:08Z"}],"graph_snapshots":[{"event_id":"sha256:4b705006a48bf6b8b7965514648d96e060b5ca7b18906fc5e35bd70539fc9967","target":"graph","created_at":"2026-05-18T00:44:34Z","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 direct detection and characterization of exoplanets will be a major scientific driver over the next decade, involving the development of very large telescopes and requires high-contrast imaging close to the optical axis. Some complex techniques have been developed to improve the performance at small separations (coronagraphy, wavefront shaping, etc). In this paper, we study some of the fundamental limitations of high contrast at the instrument design level, for cases that use a combination of a coronagraph and two deformable mirrors for wavefront shaping. In particular, we focus on small-s","authors_text":"C. Gouvret, F. Vakili, L. Abe, M. Beaulieu, P. Baudoz, P. Martinez","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-05-12T18:01:46Z","title":"High-contrast imaging at small separation: impact of the optical configuration of two deformable mirrors on dark holes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.04699","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":"sha256:12a971ce55a643cf204159730fe6cf87d2c4f9c09e15dfd01495a490bc4b2512","target":"record","created_at":"2026-05-18T00:44:34Z","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":"98e1eed3de19b885b76ded7d6bef97ca7634d709ea45694afd9e360333d017c0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-05-12T18:01:46Z","title_canon_sha256":"ea09a67cc32554dde033686ec776d2e4e6e119eb8dfeb801e3830f2bcd8147c2"},"schema_version":"1.0","source":{"id":"1705.04699","kind":"arxiv","version":1}},"canonical_sha256":"0561604763de3b811cee4f69c637c81a54e55da2eb3584f11f76851ce4942472","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0561604763de3b811cee4f69c637c81a54e55da2eb3584f11f76851ce4942472","first_computed_at":"2026-05-18T00:44:34.879072Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:44:34.879072Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CLZTkuhnxowLSJF7ZYkncBipxZ066O1Bcuu9d1jE2zlMPufSodmhJAZAd6NCki72gkXtEuqZGz3Wg3k/wADGAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:44:34.879686Z","signed_message":"canonical_sha256_bytes"},"source_id":"1705.04699","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:12a971ce55a643cf204159730fe6cf87d2c4f9c09e15dfd01495a490bc4b2512","sha256:4b705006a48bf6b8b7965514648d96e060b5ca7b18906fc5e35bd70539fc9967"],"state_sha256":"3778976b88b842703c5bf438588b363b7cd744c025195deebd6e8d41d2dbd1d8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mgjMFjANy0o1EKLblcLZ444r/GGTMj5U5xBwVILRqKEaAw7dakRBDV14BwXbC9EgKxzzm3quXQEuS/C8SEC0Dw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-24T03:25:31.354613Z","bundle_sha256":"50a69208bc9c1e2e48bd43721aab6020eba68dcc5160c155261bf0986f3707b8"}}