{"paper":{"title":"Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars III: A High Mass & Low Envelope Fraction for the Warm Neptune K2-55b","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Andrew W. Howard, Benjamin J. Fulton, Bj\\\"orn Benneke, Charles A. Beichman, Courtney D. Dressing, David R. Ciardi, Erica Gonzales, Eric D. Lopez, Erik A. Petigura, Evan Sinukoff, Heather A. Knutson, Howard Isaacson, Ian J. M. Crossfield, Jessica Krick, Jessie L.Christiansen, John Livingston, Joshua E. Schlieder, Justin R. Crepp, Kevin Hardegree-Ullman, Konstantin Batygin, Lauren M. Weiss, Lea A. Hirsch, Michael Werner, Molly Kosiarek, Rachel L. Akeson, Varoujan Gorjian","submitted_at":"2018-04-14T02:26:04Z","abstract_excerpt":"K2-55b is a Neptune-sized planet orbiting a K7 dwarf with a radius of $0.715^{+0.043}_{-0.040}R_\\odot$, a mass of $0.688\\pm0.069 M_\\odot$, and an effective temperature of $4300^{+107}_{-100}$K. Having characterized the host star using near-infrared spectra obtained at IRTF/SpeX, we observed a transit of K2-55b with Spitzer/IRAC and confirmed the accuracy of the original K2 ephemeris for future follow-up transit observations. Performing a joint fit to the Spitzer/IRAC and K2 photometry, we found a planet radius of $4.41^{+0.32}_{-0.28} R_\\oplus$, an orbital period of $2.84927265_{-6.42\\times10^"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.05148","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"}