{"paper":{"title":"The CARMENES search for exoplanets around M dwarfs. Chromospheric modeling of M2-3 V stars with PHOENIX","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, A. Schweitzer, B. Fuhrmeister, D. Galad\\'i-Enr\\'iquez, D. Hintz, D. Montes, E. N. Johnson, E. W. Guenther, F. F. Bauer, G. Anglada-Escud\\'e, I. Ribas, J. A. Caballero, J. C. Morales, J. H. M. M. Schmitt, M. Cort\\'es-Contreras, M. K\\\"urster, M. Lafarga, M. L\\'opez del Fresno, M. Zechmeister, P. H. Hauschildt, P. J. Amado, S. Czesla, S. Dreizler, S. V. Jeffers, V. J. S. B\\'ejar, V. M. Passegger, W. Seifert","submitted_at":"2019-02-11T16:51:03Z","abstract_excerpt":"Chromospheric modeling of observed differences in stellar activity lines is imperative to fully understand the upper atmospheres of late-type stars. We present one-dimensional parametrized chromosphere models computed with the atmosphere code PHOENIX using an underlying photosphere of 3500 K. The aim of this work is to model chromospheric lines of a sample of 50 M2-3 dwarfs observed in the framework of the CARMENES, the Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Echelle Spectrographs, exoplanet survey. The spectral comparison between observed "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.03992","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"}