{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2013:SMX2G5JYRCHFXTPU43GFELNKJK","short_pith_number":"pith:SMX2G5JY","schema_version":"1.0","canonical_sha256":"932fa37538888e5bcdf4e6cc522daa4a8f635437f4981bb49a3b869e9063c628","source":{"kind":"arxiv","id":"1305.4960","version":1},"attestation_state":"computed","paper":{"title":"Radial Velocity Detection of Earth-mass Planets in the Presence of Activity Noise: The Case of Alpha Centauri Bb","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.SR","authors_text":"Artie P. Hatzes","submitted_at":"2013-05-21T20:44:21Z","abstract_excerpt":"We present an analysis of the publicly available HARPS radial velocity (RV) measurements for Alpha Cen B, a star hosting an Earth-mass planet candidate in a 3.24 day orbit. The goal is to devise robust ways of extracting low-amplitude RV signals of low mass planets in the presence of activity noise. Two approaches were used to remove the stellar activity signal which dominates the RV variations: 1) Fourier component analysis (pre-whitening), and 2) local trend filtering (LTF) of the activity using short time windows of the data. The Fourier procedure results in a signal at P = 3.236 days and K"},"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":"1305.4960","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-05-21T20:44:21Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"788ad5de49d6f7bfa50866f82d642aac03f8ff746a0f7634277bbf73e94f90e8","abstract_canon_sha256":"533a1558f8594a12d2b9bf1dd2eed6ec750bda287a217e4b3f83664157ff7507"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:49:48.198792Z","signature_b64":"9S4VWG72efbAflCerB8tVnZWGSyNzWVTJPhqoiYl6A61fG7T+uTIplegannALv1ITvUi/x+E+3BChWJn+UkkCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"932fa37538888e5bcdf4e6cc522daa4a8f635437f4981bb49a3b869e9063c628","last_reissued_at":"2026-05-18T01:49:48.198222Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:49:48.198222Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Radial Velocity Detection of Earth-mass Planets in the Presence of Activity Noise: The Case of Alpha Centauri Bb","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.SR","authors_text":"Artie P. Hatzes","submitted_at":"2013-05-21T20:44:21Z","abstract_excerpt":"We present an analysis of the publicly available HARPS radial velocity (RV) measurements for Alpha Cen B, a star hosting an Earth-mass planet candidate in a 3.24 day orbit. The goal is to devise robust ways of extracting low-amplitude RV signals of low mass planets in the presence of activity noise. Two approaches were used to remove the stellar activity signal which dominates the RV variations: 1) Fourier component analysis (pre-whitening), and 2) local trend filtering (LTF) of the activity using short time windows of the data. The Fourier procedure results in a signal at P = 3.236 days and K"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.4960","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":""},"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":"1305.4960","created_at":"2026-05-18T01:49:48.198289+00:00"},{"alias_kind":"arxiv_version","alias_value":"1305.4960v1","created_at":"2026-05-18T01:49:48.198289+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.4960","created_at":"2026-05-18T01:49:48.198289+00:00"},{"alias_kind":"pith_short_12","alias_value":"SMX2G5JYRCHF","created_at":"2026-05-18T12:27:59.945178+00:00"},{"alias_kind":"pith_short_16","alias_value":"SMX2G5JYRCHFXTPU","created_at":"2026-05-18T12:27:59.945178+00:00"},{"alias_kind":"pith_short_8","alias_value":"SMX2G5JY","created_at":"2026-05-18T12:27:59.945178+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/SMX2G5JYRCHFXTPU43GFELNKJK","json":"https://pith.science/pith/SMX2G5JYRCHFXTPU43GFELNKJK.json","graph_json":"https://pith.science/api/pith-number/SMX2G5JYRCHFXTPU43GFELNKJK/graph.json","events_json":"https://pith.science/api/pith-number/SMX2G5JYRCHFXTPU43GFELNKJK/events.json","paper":"https://pith.science/paper/SMX2G5JY"},"agent_actions":{"view_html":"https://pith.science/pith/SMX2G5JYRCHFXTPU43GFELNKJK","download_json":"https://pith.science/pith/SMX2G5JYRCHFXTPU43GFELNKJK.json","view_paper":"https://pith.science/paper/SMX2G5JY","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1305.4960&json=true","fetch_graph":"https://pith.science/api/pith-number/SMX2G5JYRCHFXTPU43GFELNKJK/graph.json","fetch_events":"https://pith.science/api/pith-number/SMX2G5JYRCHFXTPU43GFELNKJK/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/SMX2G5JYRCHFXTPU43GFELNKJK/action/timestamp_anchor","attest_storage":"https://pith.science/pith/SMX2G5JYRCHFXTPU43GFELNKJK/action/storage_attestation","attest_author":"https://pith.science/pith/SMX2G5JYRCHFXTPU43GFELNKJK/action/author_attestation","sign_citation":"https://pith.science/pith/SMX2G5JYRCHFXTPU43GFELNKJK/action/citation_signature","submit_replication":"https://pith.science/pith/SMX2G5JYRCHFXTPU43GFELNKJK/action/replication_record"}},"created_at":"2026-05-18T01:49:48.198289+00:00","updated_at":"2026-05-18T01:49:48.198289+00:00"}