{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:YTHUI2HMZ6FYDQEBPZTFRV6DOE","short_pith_number":"pith:YTHUI2HM","schema_version":"1.0","canonical_sha256":"c4cf4468eccf8b81c0817e6658d7c371244e9d677029b2b01ec8f50d54848e63","source":{"kind":"arxiv","id":"1901.05173","version":1},"attestation_state":"computed","paper":{"title":"The CARMENES search for exoplanets around M dwarfs. Period search in H$\\alpha$, Na I D, and Ca II IRT lines","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Kaminski, A. Quirrenbach, A. Reiners, B. Fuhrmeister, D. Galad\\'i-Enr\\'iquez, D. Montes, E. D\\'iez Alonso, E. N. Johnson, E. W. Guenther, F. Bauer, I. Ribas, J. A. Caballero, J. H. M. M. Schmitt, M. Cort\\'es-Contreras, M. K\\\"urster, M. Lafarga, M. Zechmeister, P. J. Amado, P. Sch\\\"ofer, S. Czesla, S. Dreizler, S. V. Jeffers, V. J. S. B\\'echar","submitted_at":"2019-01-16T08:23:17Z","abstract_excerpt":"We use spectra from CARMENES, the Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Echelle Spectrographs, to search for periods in chromospheric indices in 16 M0 to M2 dwarfs. We measure spectral indices in the H$\\alpha$, the Ca II infrared triplet (IRT), and the Na I D lines to study which of these indices are best-suited to find rotation periods in these stars. Moreover, we test a number of different period-search algorithms, namely the string length method, the phase dispersion minimisation, the generalized Lomb-Scargle periodogram, and the Gauss"},"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":"1901.05173","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-01-16T08:23:17Z","cross_cats_sorted":[],"title_canon_sha256":"abbe3e686494d6d2c0727873b273dda538033b04486cca8c81b7163dcedf5092","abstract_canon_sha256":"4ddf8b1855c69bb1d5f15cbd1f9bb0c5f6e27340692473462e2ec07efa28a5d3"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:52:38.542265Z","signature_b64":"2A4ndIzpIJ/0MuKam3XFpBAm+9EOwosXwy8IzWC2bJVaWIjSU2bFV1dmXZ9I6+HwhQ/5tMORntBmUCUtJ2lBAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c4cf4468eccf8b81c0817e6658d7c371244e9d677029b2b01ec8f50d54848e63","last_reissued_at":"2026-05-17T23:52:38.541541Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:52:38.541541Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The CARMENES search for exoplanets around M dwarfs. Period search in H$\\alpha$, Na I D, and Ca II IRT lines","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Kaminski, A. Quirrenbach, A. Reiners, B. Fuhrmeister, D. Galad\\'i-Enr\\'iquez, D. Montes, E. D\\'iez Alonso, E. N. Johnson, E. W. Guenther, F. Bauer, I. Ribas, J. A. Caballero, J. H. M. M. Schmitt, M. Cort\\'es-Contreras, M. K\\\"urster, M. Lafarga, M. Zechmeister, P. J. Amado, P. Sch\\\"ofer, S. Czesla, S. Dreizler, S. V. Jeffers, V. J. S. B\\'echar","submitted_at":"2019-01-16T08:23:17Z","abstract_excerpt":"We use spectra from CARMENES, the Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Echelle Spectrographs, to search for periods in chromospheric indices in 16 M0 to M2 dwarfs. We measure spectral indices in the H$\\alpha$, the Ca II infrared triplet (IRT), and the Na I D lines to study which of these indices are best-suited to find rotation periods in these stars. Moreover, we test a number of different period-search algorithms, namely the string length method, the phase dispersion minimisation, the generalized Lomb-Scargle periodogram, and the Gauss"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.05173","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":"1901.05173","created_at":"2026-05-17T23:52:38.541660+00:00"},{"alias_kind":"arxiv_version","alias_value":"1901.05173v1","created_at":"2026-05-17T23:52:38.541660+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.05173","created_at":"2026-05-17T23:52:38.541660+00:00"},{"alias_kind":"pith_short_12","alias_value":"YTHUI2HMZ6FY","created_at":"2026-05-18T12:33:33.725879+00:00"},{"alias_kind":"pith_short_16","alias_value":"YTHUI2HMZ6FYDQEB","created_at":"2026-05-18T12:33:33.725879+00:00"},{"alias_kind":"pith_short_8","alias_value":"YTHUI2HM","created_at":"2026-05-18T12:33:33.725879+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/YTHUI2HMZ6FYDQEBPZTFRV6DOE","json":"https://pith.science/pith/YTHUI2HMZ6FYDQEBPZTFRV6DOE.json","graph_json":"https://pith.science/api/pith-number/YTHUI2HMZ6FYDQEBPZTFRV6DOE/graph.json","events_json":"https://pith.science/api/pith-number/YTHUI2HMZ6FYDQEBPZTFRV6DOE/events.json","paper":"https://pith.science/paper/YTHUI2HM"},"agent_actions":{"view_html":"https://pith.science/pith/YTHUI2HMZ6FYDQEBPZTFRV6DOE","download_json":"https://pith.science/pith/YTHUI2HMZ6FYDQEBPZTFRV6DOE.json","view_paper":"https://pith.science/paper/YTHUI2HM","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1901.05173&json=true","fetch_graph":"https://pith.science/api/pith-number/YTHUI2HMZ6FYDQEBPZTFRV6DOE/graph.json","fetch_events":"https://pith.science/api/pith-number/YTHUI2HMZ6FYDQEBPZTFRV6DOE/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/YTHUI2HMZ6FYDQEBPZTFRV6DOE/action/timestamp_anchor","attest_storage":"https://pith.science/pith/YTHUI2HMZ6FYDQEBPZTFRV6DOE/action/storage_attestation","attest_author":"https://pith.science/pith/YTHUI2HMZ6FYDQEBPZTFRV6DOE/action/author_attestation","sign_citation":"https://pith.science/pith/YTHUI2HMZ6FYDQEBPZTFRV6DOE/action/citation_signature","submit_replication":"https://pith.science/pith/YTHUI2HMZ6FYDQEBPZTFRV6DOE/action/replication_record"}},"created_at":"2026-05-17T23:52:38.541660+00:00","updated_at":"2026-05-17T23:52:38.541660+00:00"}