Herschel/HIFI observations of Mars: First detection of O-2 at submillimetre wavelengths and upper limits on HCl and H2O2
- Hartogh, P.
- Jarchow, C.
- Lellouch, E.
- de Val-Borro, M.
- Rengel, M.
- Moreno, R.
- Medvedev, A. S.
- Sagawa, H.
- Swinyard, B. M.
- Cavalie, T.
- Lis, D. C.
- Blecka, M. I.
- Banaszkiewicz, M.
- Bockelee-Morvan, D.
- Crovisier, J.
- Encrenaz, T.
- Kueppers, M.
- Lara, L. -M.
- Szutowicz, S.
- Vandenbussche, B.
- Bensch, F.
- Bergin, E. A.
- Billebaud, F.
- Biver, N.
- Blake, G. A.
- Blommaert, J. A. D. L.
- Cernicharo, J.
- Decin, L.
- Encrenaz, P.
- Feuchtgruber, H.
- Fulton, T.
- de Graauw, T.
- Jehin, E.
- Kidger, M.
- Lorente, R.
- Naylor, D. A.
- Portyankina, G.
- Sanchez-Portal, M.
- Schieder, R.
- Sidher, S.
- Thomas, N.
- Verdugo, E.
- Waelkens, C.
- Whyborn, N.
- Teyssier, D.
- Helmich, F.
- Roelfsema, P.
- Stutzki, J.
- LeDuc, H. G.
- Stern, J. A.
DOIAbstract
We report on an initial analysis of Herschel/HIFI observations of hydrogen chloride (HCl), hydrogen peroxide (H2O2), and molecular oxygen (O-2) in the Martian atmosphere performed on 13 and 16 April 2010 (L-s similar to 77 degrees). 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 H2O2. Radiative transfer model calculations indicate that the vertical profile of O-2 may not be constant. Photochemical models determine the lowest values of H2O2 to be around L-s similar to 75 degrees but overestimate the volume mixing ratio compared to our measurements
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