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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

Authors
  • Hartogh, P.
  • Jarchow, C.
  • Lellouch, E.
  • De Val-Borro, M.
  • Rengel, M.
  • Moreno, R.
  • Medvedev, A. S.
  • Sagawa, H.
  • Swinyard, B. M.
  • Cavalié, T.
  • Lis, D. C.
  • Błęcka, M. I.
  • Banaszkiewicz, M.
  • Bockelée-Morvan, D.
  • Crovisier, J.
  • Encrenaz, T.
  • Küppers, M.
  • Lara, L. -M.
  • Szutowicz, S.
  • Vandenbussche, B.
  • And 30 more
Publication Date
Jan 01, 2010
Source
HAL-INSU
Keywords
Language
English
License
Unknown
External links

Abstract

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 to our measurements.

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