{"paper":{"title":"Kepler-503b: An Object at the Hydrogen Burning Mass Limit Orbiting a Subgiant Star","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.SR","authors_text":"Caleb I. Ca\\~nas, Chad F. Bender, D. A. Garc\\'ia-Hern\\'andez, Donald P. Schneider, Fred R. Hearty, Keivan G. Stassun, Kevin R. Covey, Nathan De Lee, Robert F. Wilson, Scott W. Fleming, Steven R. Majewski, Suvrath Mahadevan, Thomas G. Beatty","submitted_at":"2018-05-22T19:13:30Z","abstract_excerpt":"Using spectroscopic radial velocities with the APOGEE instrument and Gaia distance estimates, we demonstrate that Kepler-503b, currently considered a validated Kepler planet, is in fact a brown-dwarf/low-mass star in a nearly circular 7.2-day orbit around a subgiant star. Using a mass estimate for the primary star derived from stellar models, we derive a companion mass and radius of $0.075\\pm0.003 \\ M_{\\odot}$ ($78.6\\pm3.1 \\ M_{Jup}$) and $0.099^{+0.006}_{-0.004}\\ R_{\\odot}$ ($0.96^{+0.06}_{-0.04}\\ R_{Jup}$), respectively. Assuming the system is coeval, the evolutionary state of the primary in"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.08820","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"}