{"paper":{"title":"Stellar activity analysis of Barnard's Star: Very slow rotation and evidence for long-term activity cycle","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.SR","authors_text":"A. Quirrenbach, A. Reiners, A. Sota, A. Su\\'arez Mascare\\~no, B. Harris, B. Holden, B. Toledo-Padr\\'on, C. Kotnik, C. Rodr\\'iguez-L\\'opez, D. Montes, D. Rodr\\'iguez, E. D\\'iez Alonso, E. F. Guinan, E. Herrero, E. N. Johnson, E. Pall\\'e, E. Rodr\\'iguez, F. Dubois, F. J. Aceituno, F. -J. Hambsch, F. Murgas, F. S. Urquijo, G. Anglada-Escud\\'e, I. Cervini, I. Ribas, J. A. Caballero, J. Aceituno, J. B. P. Strachan, J. Briol, J. Burt, J. C. Morales, J. Crane, J. I. Gonz\\'alez Hern\\'andez, J. Lopez, J. L. Ortiz, J. Teske, L. Barbieri, L. Logie, L. P\\'erez, M. Deldem, M. D\\'iaz, M. J. L\\'opez-Gonz\\'alez, M. Kiraga, M. McNeely, M. Perger, M. Tuomi, N. Morales, P. Arriagada, P. J. Amado, R. P. Butler, R. Rebolo, S. G. Engle, S. Mart\\'in-Ruiz, S. Rau, S. Shectman, S. Vanaverbeke, S. V. Jeffers, S. Vogt, V. J. S. B\\'ejar, V. M. Casanova, Y. Ogmen","submitted_at":"2018-12-17T11:36:31Z","abstract_excerpt":"The search for Earth-like planets around late-type stars using ultra-stable spectrographs requires a very precise characterization of the stellar activity and the magnetic cycle of the star, since these phenomena induce radial velocity (RV) signals that can be misinterpreted as planetary signals. Among the nearby stars, we have selected Barnard's Star (Gl 699) to carry out a characterization of these phenomena using a set of spectroscopic data that covers about 14.5 years and comes from seven different spectrographs: HARPS, HARPS-N, CARMENES, HIRES, UVES, APF, and PFS; and a set of photometric"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.06712","kind":"arxiv","version":3},"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/1812.06712/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"}