{"paper":{"title":"Herschel/HIFI observations of Mars: first detection of O_2 at submillimetre wavelengths and upper limits on HCl and H_2O_2","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"A. S. Medvedev, B. M. Swinyard, B. Vandenbussche, C. Jarchow, C. Waelkens, D. A. Naylor, D. Bockel\\'ee-Morvan, D. C. Lis, D. Teyssier, E. A. Bergin, E. Jehin, E. Lellouch, E. Verdugo, F. Bensch, F. Billebaud, F. Helmich, G. A. Blake, G. Portyankina, H. Feuchtgruber, H. G. LeDuc, H. Sagawa, J. A. D. L. Blommaert, J. A. Stern, J. Cernicharo, J. Crovisier, J. Stutzki, L. Decin, L.-M. Lara, M. Banaszkiewicz, M. de Val-Borro, M. I. B{\\l}\\k{e}cka, M. Kidger, M. K\\\"uppers, M. Rengel, M. S\\'anchez-Portal, N. Biver, N. Thomas, N. Whyborn, P. Encrenaz, P. Hartogh, P. Roelfsema, R. Lorente, R. Moreno, R. Schieder, S. Sidher, S. Szutowicz, T. Cavali\\'e, T. de Graauw, T. Encrenaz, T. Fulton","submitted_at":"2010-07-08T07:12:06Z","abstract_excerpt":"We report on an initial analysis of Herschel/HIFI observations of hydrogen chloride (HCl), hydrogen peroxide (H_2O_2), and molecular oxygen (O_2) in the Martian atmosphere performed on 13 and 16 April 2010 (L_s ~ 77{\\deg}). We derived a constant volume mixing ratio of 1400 +/- 120 ppm for O_2 and determined upper limits of 200 ppt for HCl and 2 ppb for H_2O_2. Radiative transfer model calculations indicate that the vertical profile of O_2 may not be constant. Photochemical models determine the lowest values of H_2O_2 to be around L_s ~ 75{\\deg} but overestimate the volume mixing ratio compared"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1007.1301","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"}