{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:QHJNVTTMDQ7LRKPEVRHNQXCLLD","short_pith_number":"pith:QHJNVTTM","canonical_record":{"source":{"id":"2309.16073","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2023-09-28T00:08:42Z","cross_cats_sorted":[],"title_canon_sha256":"54301e32dbb6eab9335718c4dd90beef170f87fb6e6413392779533c350f5a30","abstract_canon_sha256":"ce397021819e34919f97ff5bf2d6b47c3d1565725bcb27785e001947ea359e84"},"schema_version":"1.0"},"canonical_sha256":"81d2dace6c1c3eb8a9e4ac4ed85c4b58c1d1483d7ecfa2659cbbf55c84da1685","source":{"kind":"arxiv","id":"2309.16073","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2309.16073","created_at":"2026-07-05T06:55:11Z"},{"alias_kind":"arxiv_version","alias_value":"2309.16073v1","created_at":"2026-07-05T06:55:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2309.16073","created_at":"2026-07-05T06:55:11Z"},{"alias_kind":"pith_short_12","alias_value":"QHJNVTTMDQ7L","created_at":"2026-07-05T06:55:11Z"},{"alias_kind":"pith_short_16","alias_value":"QHJNVTTMDQ7LRKPE","created_at":"2026-07-05T06:55:11Z"},{"alias_kind":"pith_short_8","alias_value":"QHJNVTTM","created_at":"2026-07-05T06:55:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:QHJNVTTMDQ7LRKPEVRHNQXCLLD","target":"record","payload":{"canonical_record":{"source":{"id":"2309.16073","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2023-09-28T00:08:42Z","cross_cats_sorted":[],"title_canon_sha256":"54301e32dbb6eab9335718c4dd90beef170f87fb6e6413392779533c350f5a30","abstract_canon_sha256":"ce397021819e34919f97ff5bf2d6b47c3d1565725bcb27785e001947ea359e84"},"schema_version":"1.0"},"canonical_sha256":"81d2dace6c1c3eb8a9e4ac4ed85c4b58c1d1483d7ecfa2659cbbf55c84da1685","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:55:11.071721Z","signature_b64":"IrXbXhshej/eNLd7XuOd84aJT6AcHqqz5tejlx3gE8A8z+akhMaGG850I7WzyAZoL7rLPIoXADTCU0tF5J63DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"81d2dace6c1c3eb8a9e4ac4ed85c4b58c1d1483d7ecfa2659cbbf55c84da1685","last_reissued_at":"2026-07-05T06:55:11.071168Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:55:11.071168Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2309.16073","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":"2026-07-05T06:55:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oVOH3QIuvtPbFjaLBKgRijtOBXVzXljMwNSQJ48ouQs4qsRlTcB+Syg5zBd8rpmizAfqBwOI9IiOM7MPTRlJBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T07:04:19.983501Z"},"content_sha256":"5c1d6c14d20f11d536635b9bf4af82ced513e6dbdd854a26e5f70ef8af4dbcc1","schema_version":"1.0","event_id":"sha256:5c1d6c14d20f11d536635b9bf4af82ced513e6dbdd854a26e5f70ef8af4dbcc1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:QHJNVTTMDQ7LRKPEVRHNQXCLLD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Exploring calibration algorithms to maximize the null depth in KPIC's vortex fiber nulling mode","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Daniel Echeverri, Dimitri Mawet, Garreth Ruane, Jerry Xuan, Maxwell A. Millar-Blanchaer, Sofia Hillman","submitted_at":"2023-09-28T00:08:42Z","abstract_excerpt":"Vortex fiber nulling (VFN) is a new interferometric technique with the potential to unlock the ability to detect and spectroscopically characterize exoplanets at angular separations smaller than the conventional diffraction limit of $\\lambda$/D. In early 2022, a VFN mode was added to the Keck Planet Imager and Characterizer (KPIC) instrument suite on Keck II. VFN operates by adding an azimuthal phase ramp to the incident wavefront so that light from the star at the center of the field is prevented from coupling into a single-mode fiber. One of the key performance goals of VFN is to minimize th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2309.16073","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2309.16073/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T06:55:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ef0iUIit4TooUtdoVfo3YzyxMHeYo1xuigI9rIYi0d2npbgmjIcA+EKTQ3dut8xRXFBTg0HGOaolVzkwC9QhDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T07:04:19.984151Z"},"content_sha256":"f1915975cb465b857525690e2ec79549e1d39dbf11182f1e500f3ff4c04cecda","schema_version":"1.0","event_id":"sha256:f1915975cb465b857525690e2ec79549e1d39dbf11182f1e500f3ff4c04cecda"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QHJNVTTMDQ7LRKPEVRHNQXCLLD/bundle.json","state_url":"https://pith.science/pith/QHJNVTTMDQ7LRKPEVRHNQXCLLD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QHJNVTTMDQ7LRKPEVRHNQXCLLD/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":"2026-07-08T07:04:19Z","links":{"resolver":"https://pith.science/pith/QHJNVTTMDQ7LRKPEVRHNQXCLLD","bundle":"https://pith.science/pith/QHJNVTTMDQ7LRKPEVRHNQXCLLD/bundle.json","state":"https://pith.science/pith/QHJNVTTMDQ7LRKPEVRHNQXCLLD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QHJNVTTMDQ7LRKPEVRHNQXCLLD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:QHJNVTTMDQ7LRKPEVRHNQXCLLD","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":"ce397021819e34919f97ff5bf2d6b47c3d1565725bcb27785e001947ea359e84","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2023-09-28T00:08:42Z","title_canon_sha256":"54301e32dbb6eab9335718c4dd90beef170f87fb6e6413392779533c350f5a30"},"schema_version":"1.0","source":{"id":"2309.16073","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2309.16073","created_at":"2026-07-05T06:55:11Z"},{"alias_kind":"arxiv_version","alias_value":"2309.16073v1","created_at":"2026-07-05T06:55:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2309.16073","created_at":"2026-07-05T06:55:11Z"},{"alias_kind":"pith_short_12","alias_value":"QHJNVTTMDQ7L","created_at":"2026-07-05T06:55:11Z"},{"alias_kind":"pith_short_16","alias_value":"QHJNVTTMDQ7LRKPE","created_at":"2026-07-05T06:55:11Z"},{"alias_kind":"pith_short_8","alias_value":"QHJNVTTM","created_at":"2026-07-05T06:55:11Z"}],"graph_snapshots":[{"event_id":"sha256:f1915975cb465b857525690e2ec79549e1d39dbf11182f1e500f3ff4c04cecda","target":"graph","created_at":"2026-07-05T06:55:11Z","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/2309.16073/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Vortex fiber nulling (VFN) is a new interferometric technique with the potential to unlock the ability to detect and spectroscopically characterize exoplanets at angular separations smaller than the conventional diffraction limit of $\\lambda$/D. In early 2022, a VFN mode was added to the Keck Planet Imager and Characterizer (KPIC) instrument suite on Keck II. VFN operates by adding an azimuthal phase ramp to the incident wavefront so that light from the star at the center of the field is prevented from coupling into a single-mode fiber. One of the key performance goals of VFN is to minimize th","authors_text":"Daniel Echeverri, Dimitri Mawet, Garreth Ruane, Jerry Xuan, Maxwell A. Millar-Blanchaer, Sofia Hillman","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2023-09-28T00:08:42Z","title":"Exploring calibration algorithms to maximize the null depth in KPIC's vortex fiber nulling mode"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2309.16073","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":"sha256:5c1d6c14d20f11d536635b9bf4af82ced513e6dbdd854a26e5f70ef8af4dbcc1","target":"record","created_at":"2026-07-05T06:55:11Z","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":"ce397021819e34919f97ff5bf2d6b47c3d1565725bcb27785e001947ea359e84","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2023-09-28T00:08:42Z","title_canon_sha256":"54301e32dbb6eab9335718c4dd90beef170f87fb6e6413392779533c350f5a30"},"schema_version":"1.0","source":{"id":"2309.16073","kind":"arxiv","version":1}},"canonical_sha256":"81d2dace6c1c3eb8a9e4ac4ed85c4b58c1d1483d7ecfa2659cbbf55c84da1685","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"81d2dace6c1c3eb8a9e4ac4ed85c4b58c1d1483d7ecfa2659cbbf55c84da1685","first_computed_at":"2026-07-05T06:55:11.071168Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:55:11.071168Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IrXbXhshej/eNLd7XuOd84aJT6AcHqqz5tejlx3gE8A8z+akhMaGG850I7WzyAZoL7rLPIoXADTCU0tF5J63DA==","signature_status":"signed_v1","signed_at":"2026-07-05T06:55:11.071721Z","signed_message":"canonical_sha256_bytes"},"source_id":"2309.16073","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5c1d6c14d20f11d536635b9bf4af82ced513e6dbdd854a26e5f70ef8af4dbcc1","sha256:f1915975cb465b857525690e2ec79549e1d39dbf11182f1e500f3ff4c04cecda"],"state_sha256":"c57504825362fd14c438ec7fcafb4825c6340f2cbe4663687e7e22bdd7b12578"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qn7nQcE7LDeIc2qVBuF16o5UCsLDzzIz9Y8tn4hhNjsEeNTg1BCHb0q4mAMYmfCs8G1g5060gRaN823tQNP3BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-08T07:04:19.988562Z","bundle_sha256":"1e8ba9bd68c1b068781ad7177ada33f18da3b429dcdbc87b4a979c7996634044"}}