{"paper":{"title":"An Improved Transit Measurement for a 2.4 R_{Earth} Planet Orbiting A Bright Mid-M Dwarf K2$-$28","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Bj\\\"orn Benneke, Caroline V. Morley, Charles Beichman, Courtney D. Dressing, David Ciardi, Farisa Y. Morales, Ge Chen, Heather A. Knutson, Ian Crossfield, Jessica E. Krick, Jessie Christiansen, John Livingston, Joshua E. Schlieder, Michael Werner, Steve B. Howell, Varoujan Gorjian","submitted_at":"2018-01-30T19:02:58Z","abstract_excerpt":"We present a new {\\em Spitzer} transit observation of K2$-$28b, a sub-Neptune ($R_{\\rm p} = 2.45\\pm0.28 R_{Earth}$) orbiting a relatively bright ($V_{\\rm mag} = 16.06$, $K_{\\rm mag} = 10.75$) metal-rich M4 dwarf (EPIC 206318379). This star is one of only seven with masses less than 0.2 M_{Sun} known to host transiting planets, and the planet appears to be a slightly smaller analogue of GJ 1214b ($2.85\\pm0.20 R_{Earth}$; \\citealt{2013A&A...549A..10H}). Our new {\\em Spitzer} observations were taken two years after the original K2 discovery data and have a significantly higher cadence, allowing u"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.10177","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"}