{"paper":{"title":"CHEOPS geometric albedo of the hot Jupiter HD 209458b","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"A. Brandeker, A. Collier Cameron, A. Deline, A. Erikson, A. E. Simon, A. Fortier, A. Lecavelier des Etangs, A. Luntzer, A. M. S. Smith, B. M. Morris, B.-O. Demory, C. Broeg, C. Corral Van Damme, C. Lovis, D. Barrado y Navascues, D. Ehrenreich, D. Gandolfi, D. Kitzmann, D. Magrin, D. Pollacco, D. Queloz, D. S\\'egransan, D. Wolter, E. Pall\\'e, G. Anglada, G. Bruno, G. Olofsson, G. Peter, G. Piotto, G. Scandariato, Gy. M. Szab\\'o, H. Rauer, I. Pagano, I. Ribas, J. A. Patel, J. Cabrera, J. Farinato, J. Laskar, K. G. Isaak, K. Heng, L. Delrez, L. Fossati, L. Kiss, M. B. Davies, M. Beck, M. Deleuil, M. Fridlund, M. Gillon, M. G\\\"udel, M. Lendl, M. Steller, N. Billot, N.C. Santos, N. Rando, N. Thomas, N. Walton, O. Demangeon, P. F. L. Maxted, P. Guterman, R. Alonso, R. Ottensamer, R. Ragazzoni, S. C. C. Barros, S. Charnoz, S. G. Sousa, S. Hoyer, S. Udry, Sz. Csizmadia, T. B\\'arczy, T. Beck, V. Nascimbeni, V. Singh, V. Van Grootel, W. Baumjohann, W. Benz, X. Bonfils, Y. Alibert","submitted_at":"2022-02-23T13:53:11Z","abstract_excerpt":"We report the detection of the secondary eclipse of the hot Jupiter HD 209458b in optical/visible light using the CHEOPS space telescope. Our measurement of 20.4 +/- 3.3 ppm translates into a geometric albedo of A_g = 0.096 +/- 0.016. The previously estimated dayside temperature of about 1500 K implies that our geometric albedo measurement consists predominantly of reflected starlight and is largely uncontaminated by thermal emission. This makes the present result one of the most robust measurements of A_g for any exoplanet. Our calculations of the bandpass-integrated geometric albedo demonstr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2202.11516","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2202.11516/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}