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20 April 2024

» arxiv » 1007.1301

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Herschel/HIFI observations of Mars: first detection of O_2 at submillimetre wavelengths and upper limits on HCl and H_2O_2
P. Hartogh ; C. Jarchow ; E. Lellouch ; M. de Val-Borro ; M. Rengel ; R. Moreno ; A. S. Medvedev ; H. Sagawa ; B. M. Swinyard ; T. Cavalié ; D. C. Lis ; M. I. Błęcka ; M. Banaszkiewicz ; D. Bockelée-Morvan ; J. Crovisier ; T. Encrenaz ; M. Küppers ; L.-M. Lara ; S. Szutowicz ; B. Vandenbussche ; F. Bensch ; E. A. Bergin ; F. Billebaud ; N. Biver ; G. A. Blake ; J. A. D. L. Blommaert ; J. Cernicharo ; L. Decin ; P. Encrenaz ; H. Feuchtgruber ; T. Fulton ; T. de Graauw ; E. Jehin ; M. Kidger ; R. Lorente ; D. A. Naylor ; G. Portyankina ; M. Sánchez-Portal ; R. Schieder ; S. Sidher ; N. Thomas ; E. Verdugo ; C. Waelkens ; N. Whyborn ; D. Teyssier ; F. Helmich ; P. Roelfsema ; J. Stutzki ; H. G. LeDuc ; J. A. Stern ;
Date:	8 Jul 2010
Abstract:	We report on the 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 find lowest values for H_2O_2 around L_s ~ 75{deg} but overestimate the volume mixing ratio compared to our measurements.
Source:	arXiv, 1007.1301
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