{"paper":{"title":"Na I and H$\\alpha$ absorption features in the atmosphere of MASCARA-2b/KELT-20b","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"E. Palle, F. Yan, G. Chen, G. J. J. Talens, G. P. P. L. Otten, I. Snellen, J. I. Gonzalez Hernandez, L. Nortmann, N. Casasayas-Barris, R. Rebolo, S. Albrecht, V. Van Eylen","submitted_at":"2018-05-08T15:23:54Z","abstract_excerpt":"We have used the HARPS-North high resolution spectrograph ($\\mathcal{R}$=115 000) at TNG to observe one transit of the highly irradiated planet MASCARA-2b/KELT-20b. Using only one transit observation, we are able to clearly resolve the spectral features of the atomic sodium (Na I) doublet and the H$\\alpha$ line in its atmosphere, measuring absorption depths of 0.17$\\pm$0.03$\\%$ and 0.59$\\pm$0.08$\\%$ for a 0.75 $\\AA$ passband, respectively. These absorptions are corroborated with the transmission measured from their respective transmission light curves, which show a large Rossiter-McLaughlin ef"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.03102","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"}