{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2002:FQ6DOI3BKBZIFFL7NKFEECUT2C","short_pith_number":"pith:FQ6DOI3B","canonical_record":{"source":{"id":"astro-ph/0201162","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2002-01-10T18:54:50Z","cross_cats_sorted":[],"title_canon_sha256":"a54278dbb7e82c09c822c85eb3799abd5cf8772ff374025180a68de94fe3da1c","abstract_canon_sha256":"ca3b2d4548b621eacd32031216d9f74d22f3f433d80bd0044f29dd8354c1146f"},"schema_version":"1.0"},"canonical_sha256":"2c3c372361507282957f6a8a420a93d099f7f5b9f6dcab723e2deca8d97ebd6c","source":{"kind":"arxiv","id":"astro-ph/0201162","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0201162","created_at":"2026-07-04T16:29:14Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0201162v1","created_at":"2026-07-04T16:29:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0201162","created_at":"2026-07-04T16:29:14Z"},{"alias_kind":"pith_short_12","alias_value":"FQ6DOI3BKBZI","created_at":"2026-07-04T16:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"FQ6DOI3BKBZIFFL7","created_at":"2026-07-04T16:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"FQ6DOI3B","created_at":"2026-07-04T16:29:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2002:FQ6DOI3BKBZIFFL7NKFEECUT2C","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0201162","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2002-01-10T18:54:50Z","cross_cats_sorted":[],"title_canon_sha256":"a54278dbb7e82c09c822c85eb3799abd5cf8772ff374025180a68de94fe3da1c","abstract_canon_sha256":"ca3b2d4548b621eacd32031216d9f74d22f3f433d80bd0044f29dd8354c1146f"},"schema_version":"1.0"},"canonical_sha256":"2c3c372361507282957f6a8a420a93d099f7f5b9f6dcab723e2deca8d97ebd6c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:29:14.312573Z","signature_b64":"Re6KVhC/WtiAYec/QDnxX+zCqEfRqL6thnAlsnU2FS44UuhZ0D/lTdUfezt7ByWuj1Jqgl4xITswKZ3eStH5Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2c3c372361507282957f6a8a420a93d099f7f5b9f6dcab723e2deca8d97ebd6c","last_reissued_at":"2026-07-04T16:29:14.312213Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:29:14.312213Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0201162","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":"2026-07-04T16:29:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JEr1ZemtDZrj23U+KLAHumvvlsefN494zGPCS61xaAIoOzZZvVb+jdzaaSdykpKnVKvnqMegDY8HZ+rtB3dqDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T10:07:03.898289Z"},"content_sha256":"6928a6a93435c61f9e083c900601f4bdbada2c90a4506ac17e1e280bffa63e50","schema_version":"1.0","event_id":"sha256:6928a6a93435c61f9e083c900601f4bdbada2c90a4506ac17e1e280bffa63e50"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2002:FQ6DOI3BKBZIFFL7NKFEECUT2C","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Periodic photometric variability of the brown dwarf Kelu-1","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Cambridge), C. G. Tinney (AAO), F. J. Clarke (IoA, K. R. Covey (Carleton College)","submitted_at":"2002-01-10T18:54:50Z","abstract_excerpt":"We have detected a strong periodicity of 1.80+/-0.05 hours in photometric observations of the brown dwarf Kelu-1. The peak-to-peak amplitude of the variation is ~1.1% (11.9+/-0.8 mmag) in a 41nm wide filter centred on 857nm and including the dust/temperature sensitive TiO & CrH bands. We have identified two plausible causes of variability: surface features rotating into- and out-of-view and so modulating the light curve at the rotation period; or, elliposidal variability caused by an orbiting companion. In the first scenario, we combine the observed vsin(i) of Kelu-1 and standard model radius "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0201162","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/astro-ph/0201162/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":"2026-07-04T16:29:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KzEIa3eo2u7yPEdiwu/+2pOdJ7CSiTQ5HX2SXZNGBZIZ91a63YYKjGOJp4uM/9i+738kqhAEh75ODt/sVqjuBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T10:07:03.898780Z"},"content_sha256":"77693590dfe95c466f0fe06a59b1a364ca6d08671dcde1fdfc068290ad433dc6","schema_version":"1.0","event_id":"sha256:77693590dfe95c466f0fe06a59b1a364ca6d08671dcde1fdfc068290ad433dc6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C/bundle.json","state_url":"https://pith.science/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C/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":"2026-08-05T10:07:03Z","links":{"resolver":"https://pith.science/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C","bundle":"https://pith.science/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C/bundle.json","state":"https://pith.science/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2002:FQ6DOI3BKBZIFFL7NKFEECUT2C","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":"ca3b2d4548b621eacd32031216d9f74d22f3f433d80bd0044f29dd8354c1146f","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2002-01-10T18:54:50Z","title_canon_sha256":"a54278dbb7e82c09c822c85eb3799abd5cf8772ff374025180a68de94fe3da1c"},"schema_version":"1.0","source":{"id":"astro-ph/0201162","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0201162","created_at":"2026-07-04T16:29:14Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0201162v1","created_at":"2026-07-04T16:29:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0201162","created_at":"2026-07-04T16:29:14Z"},{"alias_kind":"pith_short_12","alias_value":"FQ6DOI3BKBZI","created_at":"2026-07-04T16:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"FQ6DOI3BKBZIFFL7","created_at":"2026-07-04T16:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"FQ6DOI3B","created_at":"2026-07-04T16:29:14Z"}],"graph_snapshots":[{"event_id":"sha256:77693590dfe95c466f0fe06a59b1a364ca6d08671dcde1fdfc068290ad433dc6","target":"graph","created_at":"2026-07-04T16:29:14Z","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/astro-ph/0201162/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We have detected a strong periodicity of 1.80+/-0.05 hours in photometric observations of the brown dwarf Kelu-1. The peak-to-peak amplitude of the variation is ~1.1% (11.9+/-0.8 mmag) in a 41nm wide filter centred on 857nm and including the dust/temperature sensitive TiO & CrH bands. We have identified two plausible causes of variability: surface features rotating into- and out-of-view and so modulating the light curve at the rotation period; or, elliposidal variability caused by an orbiting companion. In the first scenario, we combine the observed vsin(i) of Kelu-1 and standard model radius ","authors_text":"Cambridge), C. G. Tinney (AAO), F. J. Clarke (IoA, K. R. Covey (Carleton College)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2002-01-10T18:54:50Z","title":"Periodic photometric variability of the brown dwarf Kelu-1"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0201162","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":"sha256:6928a6a93435c61f9e083c900601f4bdbada2c90a4506ac17e1e280bffa63e50","target":"record","created_at":"2026-07-04T16:29:14Z","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":"ca3b2d4548b621eacd32031216d9f74d22f3f433d80bd0044f29dd8354c1146f","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2002-01-10T18:54:50Z","title_canon_sha256":"a54278dbb7e82c09c822c85eb3799abd5cf8772ff374025180a68de94fe3da1c"},"schema_version":"1.0","source":{"id":"astro-ph/0201162","kind":"arxiv","version":1}},"canonical_sha256":"2c3c372361507282957f6a8a420a93d099f7f5b9f6dcab723e2deca8d97ebd6c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2c3c372361507282957f6a8a420a93d099f7f5b9f6dcab723e2deca8d97ebd6c","first_computed_at":"2026-07-04T16:29:14.312213Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:29:14.312213Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Re6KVhC/WtiAYec/QDnxX+zCqEfRqL6thnAlsnU2FS44UuhZ0D/lTdUfezt7ByWuj1Jqgl4xITswKZ3eStH5Bg==","signature_status":"signed_v1","signed_at":"2026-07-04T16:29:14.312573Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0201162","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6928a6a93435c61f9e083c900601f4bdbada2c90a4506ac17e1e280bffa63e50","sha256:77693590dfe95c466f0fe06a59b1a364ca6d08671dcde1fdfc068290ad433dc6"],"state_sha256":"f67b7770524fda02fdb1aa47b2a05161b92267d14be435404a79ba665bd69197"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JVdb0qtWktxImLRWYu/diKSJaZ+XPmbnmf16Zfen9ShhZq8knFzxnAXWQHJQtRmU+/748sdgY2XgtlIgPLhvDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T10:07:03.902519Z","bundle_sha256":"7d69f4109fa54842f449574d71e8537e9c3ec5e49afbfc1d92d055334f889f7a"}}