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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

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HAL-INSU
Keywords
  • Earth And Planetary Astrophysics
  • Astrophysics
  • [Phys.Astr.Ep] Physics [Physics]/Astrophysics [Astro-Ph]/Earth And Planetary Astrophysics [Astro-Ph.
  • [Sdu.Astr.Ep] Sciences Of The Universe [Physics]/Astrophysics [Astro-Ph]/Earth And Planetary Astroph
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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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