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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 1 C. Jarchow E. Lellouch 2 M. de Val-Borro M. Rengel R. Moreno 2 A. S. Medvedev H. Sagawa 3 B. M. Swinyard T. Cavalié 4, 5, 6, 7 D. C. Lis 8 M. I. Błęcka M. Banaszkiewicz 9 D. Bockelée-Morvan 2 J. Crovisier 2 T. Encrenaz 2 M. Küppers 1 L. -M. Lara S. Szutowicz B. Vandenbussche F. Bensch E. A. Bergin 10 F. Billebaud 4, 5, 6, 7 N. Biver 2 G. A. Blake 11 J. A. D. L. Blommaert J. Cernicharo 12 L. Decin 13 P. Encrenaz 14 H. Feuchtgruber T. Fulton T. de Graauw E. Jehin 15 M. Kidger R. Lorente D. A. Naylor G. Portyankina M. Sánchez-Portal R. Schieder S. Sidher Noémie Thomas 16 E. Verdugo C. Waelkens N. Whyborn D. Teyssier 17 F. Helmich 18 P. Roelfsema J. Stutzki 18 H. G. Leduc J. A. Stern
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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Submitted on : Friday, September 24, 2010 - 12:02:12 PM
Last modification on : Wednesday, November 24, 2021 - 4:52:02 PM

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P. Hartogh, C. Jarchow, E. Lellouch, M. de Val-Borro, M. Rengel, et al.. Herschel/HIFI observations of Mars: first detection of O_2 at submillimetre wavelengths and upper limits on HCl and H_2O_2. Astronomy and Astrophysics - A&A, EDP Sciences, 2010, 521, pp.id.L49. ⟨10.1051/0004-6361/201015160⟩. ⟨hal-00520822⟩

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