{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:6EX2DFYWPPHMM5YRTRVGBKCPRR","short_pith_number":"pith:6EX2DFYW","canonical_record":{"source":{"id":"2208.09249","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2022-08-19T10:06:23Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"d57bff492dbf9b1af6277259e9d906ca3f06cba71aa63970bff1371b30a93181","abstract_canon_sha256":"99acf2b20dedd9804f66a4d1b9fd317ecd4dd314ac81653f973d1f0abd04fc14"},"schema_version":"1.0"},"canonical_sha256":"f12fa197167bcec677119c6a60a84f8c7baeb30c78984c548e6cdd2dbfc86c31","source":{"kind":"arxiv","id":"2208.09249","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2208.09249","created_at":"2026-07-05T04:53:04Z"},{"alias_kind":"arxiv_version","alias_value":"2208.09249v1","created_at":"2026-07-05T04:53:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2208.09249","created_at":"2026-07-05T04:53:04Z"},{"alias_kind":"pith_short_12","alias_value":"6EX2DFYWPPHM","created_at":"2026-07-05T04:53:04Z"},{"alias_kind":"pith_short_16","alias_value":"6EX2DFYWPPHMM5YR","created_at":"2026-07-05T04:53:04Z"},{"alias_kind":"pith_short_8","alias_value":"6EX2DFYW","created_at":"2026-07-05T04:53:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:6EX2DFYWPPHMM5YRTRVGBKCPRR","target":"record","payload":{"canonical_record":{"source":{"id":"2208.09249","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2022-08-19T10:06:23Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"d57bff492dbf9b1af6277259e9d906ca3f06cba71aa63970bff1371b30a93181","abstract_canon_sha256":"99acf2b20dedd9804f66a4d1b9fd317ecd4dd314ac81653f973d1f0abd04fc14"},"schema_version":"1.0"},"canonical_sha256":"f12fa197167bcec677119c6a60a84f8c7baeb30c78984c548e6cdd2dbfc86c31","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:53:04.583978Z","signature_b64":"xg4VJ6CDyzU+f0gr/DcO63FgMO15P4HDfgvd29WAhkk4MEdXxeNT2rErNpOH3siFmKLqRRn2pJBuE7C9Ia6PBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f12fa197167bcec677119c6a60a84f8c7baeb30c78984c548e6cdd2dbfc86c31","last_reissued_at":"2026-07-05T04:53:04.583548Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:53:04.583548Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2208.09249","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":"2026-07-05T04:53:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ivU9VmA5dhXawaA7Tv4kbpeq+ewA7e6lunwhOT31DiOPxK3sDV+dbqo1ofzN+FQGVNE0LlHc2jahL5o3oGsYDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T15:38:21.323234Z"},"content_sha256":"e5c4b54ee8dd1be3bf3cd9dbadb691c83d1d80d0c1c736da79be6d178778fdfc","schema_version":"1.0","event_id":"sha256:e5c4b54ee8dd1be3bf3cd9dbadb691c83d1d80d0c1c736da79be6d178778fdfc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:6EX2DFYWPPHMM5YRTRVGBKCPRR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Multi-colour optical light curves of the companion star to the millisecond pulsar PSR J2051-0827","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.SR","authors_text":"A. J. Brown, B. W. Stappers, C. J. Clark, D. I. Sahman, D. Mata S\\'anchez, E. Breedt, G. Voisin, I. Pelisoli, J. F. Wild, M. H. van Kerkwijk, M. J. Dyer, M. J. Green, M. R. Kennedy, P. Kerry, R. P. Breton, S. G. Parsons, S. P. Littlefair, T. R. Marsh, V. S. Dhillon","submitted_at":"2022-08-19T10:06:23Z","abstract_excerpt":"We present simultaneous, multi-colour optical light curves of the companion star to the black-widow pulsar PSR J2051-0827, obtained approximately 10 years apart using ULTRACAM and HiPERCAM, respectively. The ULTRACAM light curves confirm the previously reported asymmetry in which the leading hemisphere of the companion star appears to be brighter than the trailing hemisphere. The HiPERCAM light curves, however, do not show this asymmetry, demonstrating that whatever mechanism is responsible for it varies on timescales of a decade or less. We fit the symmetrical HiPERCAM light curves with a dir"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2208.09249","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/2208.09249/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":"2026-07-05T04:53:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+EYHSXlFwQhXyGfVhdHA37HAVYaddJjHpf8LCwsnt7Y9fpQ7dtRrPO3eSQ8o34abpR3FP+id6FTKk4r1wnfIBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T15:38:21.323873Z"},"content_sha256":"3e471e6c597661e204a7bffc8264afd866e31852c632492acb298e6b9bfbab54","schema_version":"1.0","event_id":"sha256:3e471e6c597661e204a7bffc8264afd866e31852c632492acb298e6b9bfbab54"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6EX2DFYWPPHMM5YRTRVGBKCPRR/bundle.json","state_url":"https://pith.science/pith/6EX2DFYWPPHMM5YRTRVGBKCPRR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6EX2DFYWPPHMM5YRTRVGBKCPRR/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":"2026-07-05T15:38:21Z","links":{"resolver":"https://pith.science/pith/6EX2DFYWPPHMM5YRTRVGBKCPRR","bundle":"https://pith.science/pith/6EX2DFYWPPHMM5YRTRVGBKCPRR/bundle.json","state":"https://pith.science/pith/6EX2DFYWPPHMM5YRTRVGBKCPRR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6EX2DFYWPPHMM5YRTRVGBKCPRR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:6EX2DFYWPPHMM5YRTRVGBKCPRR","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":"99acf2b20dedd9804f66a4d1b9fd317ecd4dd314ac81653f973d1f0abd04fc14","cross_cats_sorted":["astro-ph.HE"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2022-08-19T10:06:23Z","title_canon_sha256":"d57bff492dbf9b1af6277259e9d906ca3f06cba71aa63970bff1371b30a93181"},"schema_version":"1.0","source":{"id":"2208.09249","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2208.09249","created_at":"2026-07-05T04:53:04Z"},{"alias_kind":"arxiv_version","alias_value":"2208.09249v1","created_at":"2026-07-05T04:53:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2208.09249","created_at":"2026-07-05T04:53:04Z"},{"alias_kind":"pith_short_12","alias_value":"6EX2DFYWPPHM","created_at":"2026-07-05T04:53:04Z"},{"alias_kind":"pith_short_16","alias_value":"6EX2DFYWPPHMM5YR","created_at":"2026-07-05T04:53:04Z"},{"alias_kind":"pith_short_8","alias_value":"6EX2DFYW","created_at":"2026-07-05T04:53:04Z"}],"graph_snapshots":[{"event_id":"sha256:3e471e6c597661e204a7bffc8264afd866e31852c632492acb298e6b9bfbab54","target":"graph","created_at":"2026-07-05T04:53:04Z","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/2208.09249/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present simultaneous, multi-colour optical light curves of the companion star to the black-widow pulsar PSR J2051-0827, obtained approximately 10 years apart using ULTRACAM and HiPERCAM, respectively. The ULTRACAM light curves confirm the previously reported asymmetry in which the leading hemisphere of the companion star appears to be brighter than the trailing hemisphere. The HiPERCAM light curves, however, do not show this asymmetry, demonstrating that whatever mechanism is responsible for it varies on timescales of a decade or less. We fit the symmetrical HiPERCAM light curves with a dir","authors_text":"A. J. Brown, B. W. Stappers, C. J. Clark, D. I. Sahman, D. Mata S\\'anchez, E. Breedt, G. Voisin, I. Pelisoli, J. F. Wild, M. H. van Kerkwijk, M. J. Dyer, M. J. Green, M. R. Kennedy, P. Kerry, R. P. Breton, S. G. Parsons, S. P. Littlefair, T. R. Marsh, V. S. Dhillon","cross_cats":["astro-ph.HE"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2022-08-19T10:06:23Z","title":"Multi-colour optical light curves of the companion star to the millisecond pulsar PSR J2051-0827"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2208.09249","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:e5c4b54ee8dd1be3bf3cd9dbadb691c83d1d80d0c1c736da79be6d178778fdfc","target":"record","created_at":"2026-07-05T04:53:04Z","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":"99acf2b20dedd9804f66a4d1b9fd317ecd4dd314ac81653f973d1f0abd04fc14","cross_cats_sorted":["astro-ph.HE"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2022-08-19T10:06:23Z","title_canon_sha256":"d57bff492dbf9b1af6277259e9d906ca3f06cba71aa63970bff1371b30a93181"},"schema_version":"1.0","source":{"id":"2208.09249","kind":"arxiv","version":1}},"canonical_sha256":"f12fa197167bcec677119c6a60a84f8c7baeb30c78984c548e6cdd2dbfc86c31","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f12fa197167bcec677119c6a60a84f8c7baeb30c78984c548e6cdd2dbfc86c31","first_computed_at":"2026-07-05T04:53:04.583548Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:53:04.583548Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xg4VJ6CDyzU+f0gr/DcO63FgMO15P4HDfgvd29WAhkk4MEdXxeNT2rErNpOH3siFmKLqRRn2pJBuE7C9Ia6PBw==","signature_status":"signed_v1","signed_at":"2026-07-05T04:53:04.583978Z","signed_message":"canonical_sha256_bytes"},"source_id":"2208.09249","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e5c4b54ee8dd1be3bf3cd9dbadb691c83d1d80d0c1c736da79be6d178778fdfc","sha256:3e471e6c597661e204a7bffc8264afd866e31852c632492acb298e6b9bfbab54"],"state_sha256":"85de20bcbdae2550b97da147f0314512da1f81a95f363bb6b4d427c7049f4412"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"omfOMKKwYLEmwjsEILf0fCzK90MgBQE9PPPLrt5NFqc5/zufKpSVlFWLKLM7hMHfDmmy3cJ4coeTvQbWlvDYBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T15:38:21.327536Z","bundle_sha256":"4bdd7c2d67a746d1c474a00e0da4bc25cb89d336940c4af34250b2798b5c122b"}}