{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:EQZ4ALB57GXZCL7HCPPIY6WXAO","short_pith_number":"pith:EQZ4ALB5","canonical_record":{"source":{"id":"1909.13107","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-28T14:54:31Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"f2e923bb4f8f7d6d98c083f3469a0b73177aa32df9cc17fef72360330d83bdc8","abstract_canon_sha256":"5a7e4b39ca9c0bb15dd9ab83713a54cdd5aedd50fa79e2350a07df192cbe1da8"},"schema_version":"1.0"},"canonical_sha256":"2433c02c3df9af912fe713de8c7ad7039c05860c759de9d127b343d166365f18","source":{"kind":"arxiv","id":"1909.13107","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.13107","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"arxiv_version","alias_value":"1909.13107v1","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.13107","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"pith_short_12","alias_value":"EQZ4ALB57GXZ","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"pith_short_16","alias_value":"EQZ4ALB57GXZCL7H","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"pith_short_8","alias_value":"EQZ4ALB5","created_at":"2026-07-05T00:33:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:EQZ4ALB57GXZCL7HCPPIY6WXAO","target":"record","payload":{"canonical_record":{"source":{"id":"1909.13107","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-28T14:54:31Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"f2e923bb4f8f7d6d98c083f3469a0b73177aa32df9cc17fef72360330d83bdc8","abstract_canon_sha256":"5a7e4b39ca9c0bb15dd9ab83713a54cdd5aedd50fa79e2350a07df192cbe1da8"},"schema_version":"1.0"},"canonical_sha256":"2433c02c3df9af912fe713de8c7ad7039c05860c759de9d127b343d166365f18","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:33:17.514088Z","signature_b64":"Wg/gSccoz2c9sQPPhJWMBtKG9IrSydOFBH61GYa9HczVCtwXgGbrq2/kf+5P8bBIMlnYZyVbBiDj+QHXpdVfCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2433c02c3df9af912fe713de8c7ad7039c05860c759de9d127b343d166365f18","last_reissued_at":"2026-07-05T00:33:17.513550Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:33:17.513550Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1909.13107","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":"2026-07-05T00:33:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+bGxtjovE5mnzqYS1/WgFInwx75RFPLcxHNyV8us8rBhZYlOM0vwnzc+zawIVCc6MZKnZ4fc9hDLWcmU2xyrDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T22:36:40.326023Z"},"content_sha256":"eb3ac3ad06f997241bcd8cb40d0df171f776be7eec3f60c024eae708f39e333e","schema_version":"1.0","event_id":"sha256:eb3ac3ad06f997241bcd8cb40d0df171f776be7eec3f60c024eae708f39e333e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:EQZ4ALB57GXZCL7HCPPIY6WXAO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The polarimetric imaging mode of VLT/SPHERE/IRDIS I: Description, data reduction and observing strategy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.IM","authors_text":"A. Boccaletti, A. Vigan, C. Dominik, C. Ginski, C. U. Keller, D. Mouillet, D. M. Stam, D. Perret, E. Hugot, E. Lagadec, F. M\\'enard, F. Snik, G. Chauvin, H. Le Coroller, H. M. Schmid, J. de Boer, J.-F. Sauvage, J. H. Girard, J.-L. Beuzit, J. Milli, J. Pragt, K. Dohlen, L. Gluck, L. Weber, M. Feldt, M. Kasper, M. Langlois, M. Turatto, P. Martinez, P. Rabou, R. G. van Holstein, S. Udry, T. Henning, Z. Wahhaj","submitted_at":"2019-09-28T14:54:31Z","abstract_excerpt":"Context. Polarimetric imaging is one of the most effective techniques for high-contrast imaging and characterization of protoplanetary disks, and has the potential to be instrumental in characterizing exoplanets. VLT/SPHERE contains the InfraRed Dual-band Imager and Spectrograph (IRDIS) with a dual-beam polarimetric imaging (DPI) mode, which offers the capability to obtain linear polarization images at high contrast and resolution. Aims. We aim to provide an overview of IRDIS/DPI and study its optical design to improve observing strategies and data reduction. Methods. For H-band observations o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.13107","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/1909.13107/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":"2026-07-05T00:33:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eyHzGKcPi5nBPp7T3WVbLob85IIC4CGb9IRzn+6MIib0JZglHCbUB0gZci3q0IQyIDIBCRXsj9Pr4T50ERW5CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T22:36:40.326520Z"},"content_sha256":"78055c49e3f21e6662f29aa21bd06ea86536c6f7c1714dde7078f98de880084b","schema_version":"1.0","event_id":"sha256:78055c49e3f21e6662f29aa21bd06ea86536c6f7c1714dde7078f98de880084b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EQZ4ALB57GXZCL7HCPPIY6WXAO/bundle.json","state_url":"https://pith.science/pith/EQZ4ALB57GXZCL7HCPPIY6WXAO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EQZ4ALB57GXZCL7HCPPIY6WXAO/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":"2026-08-04T22:36:40Z","links":{"resolver":"https://pith.science/pith/EQZ4ALB57GXZCL7HCPPIY6WXAO","bundle":"https://pith.science/pith/EQZ4ALB57GXZCL7HCPPIY6WXAO/bundle.json","state":"https://pith.science/pith/EQZ4ALB57GXZCL7HCPPIY6WXAO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EQZ4ALB57GXZCL7HCPPIY6WXAO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:EQZ4ALB57GXZCL7HCPPIY6WXAO","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":"5a7e4b39ca9c0bb15dd9ab83713a54cdd5aedd50fa79e2350a07df192cbe1da8","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-28T14:54:31Z","title_canon_sha256":"f2e923bb4f8f7d6d98c083f3469a0b73177aa32df9cc17fef72360330d83bdc8"},"schema_version":"1.0","source":{"id":"1909.13107","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.13107","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"arxiv_version","alias_value":"1909.13107v1","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.13107","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"pith_short_12","alias_value":"EQZ4ALB57GXZ","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"pith_short_16","alias_value":"EQZ4ALB57GXZCL7H","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"pith_short_8","alias_value":"EQZ4ALB5","created_at":"2026-07-05T00:33:17Z"}],"graph_snapshots":[{"event_id":"sha256:78055c49e3f21e6662f29aa21bd06ea86536c6f7c1714dde7078f98de880084b","target":"graph","created_at":"2026-07-05T00:33:17Z","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/1909.13107/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Context. Polarimetric imaging is one of the most effective techniques for high-contrast imaging and characterization of protoplanetary disks, and has the potential to be instrumental in characterizing exoplanets. VLT/SPHERE contains the InfraRed Dual-band Imager and Spectrograph (IRDIS) with a dual-beam polarimetric imaging (DPI) mode, which offers the capability to obtain linear polarization images at high contrast and resolution. Aims. We aim to provide an overview of IRDIS/DPI and study its optical design to improve observing strategies and data reduction. Methods. For H-band observations o","authors_text":"A. Boccaletti, A. Vigan, C. Dominik, C. Ginski, C. U. Keller, D. Mouillet, D. M. Stam, D. Perret, E. Hugot, E. Lagadec, F. M\\'enard, F. Snik, G. Chauvin, H. Le Coroller, H. M. Schmid, J. de Boer, J.-F. Sauvage, J. H. Girard, J.-L. Beuzit, J. Milli, J. Pragt, K. Dohlen, L. Gluck, L. Weber, M. Feldt, M. Kasper, M. Langlois, M. Turatto, P. Martinez, P. Rabou, R. G. van Holstein, S. Udry, T. Henning, Z. Wahhaj","cross_cats":["astro-ph.EP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-28T14:54:31Z","title":"The polarimetric imaging mode of VLT/SPHERE/IRDIS I: Description, data reduction and observing strategy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.13107","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:eb3ac3ad06f997241bcd8cb40d0df171f776be7eec3f60c024eae708f39e333e","target":"record","created_at":"2026-07-05T00:33:17Z","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":"5a7e4b39ca9c0bb15dd9ab83713a54cdd5aedd50fa79e2350a07df192cbe1da8","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-28T14:54:31Z","title_canon_sha256":"f2e923bb4f8f7d6d98c083f3469a0b73177aa32df9cc17fef72360330d83bdc8"},"schema_version":"1.0","source":{"id":"1909.13107","kind":"arxiv","version":1}},"canonical_sha256":"2433c02c3df9af912fe713de8c7ad7039c05860c759de9d127b343d166365f18","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2433c02c3df9af912fe713de8c7ad7039c05860c759de9d127b343d166365f18","first_computed_at":"2026-07-05T00:33:17.513550Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:33:17.513550Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Wg/gSccoz2c9sQPPhJWMBtKG9IrSydOFBH61GYa9HczVCtwXgGbrq2/kf+5P8bBIMlnYZyVbBiDj+QHXpdVfCA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:33:17.514088Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.13107","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:eb3ac3ad06f997241bcd8cb40d0df171f776be7eec3f60c024eae708f39e333e","sha256:78055c49e3f21e6662f29aa21bd06ea86536c6f7c1714dde7078f98de880084b"],"state_sha256":"125325b9c814e58eaca8e3a64d9a5ddb109249c0160a8f1f4aa2b512a39ace61"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GWc2CwoAqFzWm70smp1vAC8n9+vUzWBeifgqHXBdTNIKLhZQqL5sdeHVrl9IBgcp38ZkBpMf+5gwuGW1kuyaCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T22:36:40.329840Z","bundle_sha256":"12a62dcdcac3efc06920de303b136a7f98062ae0ff9fb3787a9887f64ee1ec76"}}