{"paper":{"title":"The CARMENES search for exoplanets around M dwarfs: A low-mass planet in the temperate zone of the nearby K2-18","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Adrian Kaminski, Andreas Quirrenbach, Ansgar Reiners, Artie P. Hatzes, Christopher Marvin, David Montes, Guillem Anglada-Escud\\'e, Hans-J\\\"urgen Hagen, Ignasi Ribas, Jes\\'us Aceituno, Jos\\'e A. Caballero, Juan C. Morales, Lev Tal-Or, Marina Lafarga, Martin K\\\"urster, Mathias Zechmeister, Matthias Mallonn, Paula Sarkis, Pedro J. Amado, Ralf Launhardt, Sandra Jeffers, Stefan Dreizler, Thomas Henning, Trifon Trifonov, Victor J. S. B\\'ejar","submitted_at":"2018-05-02T14:08:58Z","abstract_excerpt":"K2-18 is a nearby M2.5 dwarf, located at 34 pc and hosting a transiting planet which was first discovered by the {\\it K2} mission and later confirmed with {\\it Spitzer Space Telescope} observations. With a radius of $\\sim 2 \\, R_{\\oplus}$ and an orbital period of $\\sim 33$ days, the planet lies in the temperate zone of its host star and receives stellar irradiation similar to Earth. Here we perform radial velocity follow-up observations with the visual channel of CARMENES with the goal of determining the mass and density of the planet. We measure a planetary semi-amplitude of $K_b \\sim 3.5$ \\m"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.00830","kind":"arxiv","version":2},"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"}