{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2002:FQ6DOI3BKBZIFFL7NKFEECUT2C","short_pith_number":"pith:FQ6DOI3B","schema_version":"1.0","canonical_sha256":"2c3c372361507282957f6a8a420a93d099f7f5b9f6dcab723e2deca8d97ebd6c","source":{"kind":"arxiv","id":"astro-ph/0201162","version":1},"attestation_state":"computed","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 "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"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"},"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"},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0201162","created_at":"2026-07-04T16:29:14.312272+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0201162v1","created_at":"2026-07-04T16:29:14.312272+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0201162","created_at":"2026-07-04T16:29:14.312272+00:00"},{"alias_kind":"pith_short_12","alias_value":"FQ6DOI3BKBZI","created_at":"2026-07-04T16:29:14.312272+00:00"},{"alias_kind":"pith_short_16","alias_value":"FQ6DOI3BKBZIFFL7","created_at":"2026-07-04T16:29:14.312272+00:00"},{"alias_kind":"pith_short_8","alias_value":"FQ6DOI3B","created_at":"2026-07-04T16:29:14.312272+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C","json":"https://pith.science/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C.json","graph_json":"https://pith.science/api/pith-number/FQ6DOI3BKBZIFFL7NKFEECUT2C/graph.json","events_json":"https://pith.science/api/pith-number/FQ6DOI3BKBZIFFL7NKFEECUT2C/events.json","paper":"https://pith.science/paper/FQ6DOI3B"},"agent_actions":{"view_html":"https://pith.science/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C","download_json":"https://pith.science/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C.json","view_paper":"https://pith.science/paper/FQ6DOI3B","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0201162&json=true","fetch_graph":"https://pith.science/api/pith-number/FQ6DOI3BKBZIFFL7NKFEECUT2C/graph.json","fetch_events":"https://pith.science/api/pith-number/FQ6DOI3BKBZIFFL7NKFEECUT2C/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C/action/timestamp_anchor","attest_storage":"https://pith.science/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C/action/storage_attestation","attest_author":"https://pith.science/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C/action/author_attestation","sign_citation":"https://pith.science/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C/action/citation_signature","submit_replication":"https://pith.science/pith/FQ6DOI3BKBZIFFL7NKFEECUT2C/action/replication_record"}},"created_at":"2026-07-04T16:29:14.312272+00:00","updated_at":"2026-07-04T16:29:14.312272+00:00"}