First results on Martian carbon monoxide from Herschel/HIFI observations

P. Hartogh (1) , M. I. Błęcka , C. Jarchow , H. Sagawa (2) , E. Lellouch (3) , M. de Val-Borro , M. Rengel , A. S. Medvedev , B. M. Swinyard , R. Moreno (3) , T. Cavalié (4, 5, 6, 7) , D. C. Lis (8) , M. Banaszkiewicz (9) , D. Bockelée-Morvan (3) , J. Crovisier (3) , T. Encrenaz (3) , M. Küppers (1) , L. -M. Lara , S. Szutowicz , B. Vandenbussche , F. Bensch , E. A. Bergin (10) , F. Billebaud (4, 5, 6, 7) , N. Biver (3) , 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 , N Thomas (16) , E. Verdugo , C. Waelkens , A. Lorenzani (17) , G. Tofani , E. Natale , Justin Pearson (18) , T. Klein (19) , C. Leinz , R. Güsten , C. Kramer (20)

1 MPS - Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research
2 Center for Mathematics and Physics
3 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
4 OASU - Observatoire aquitain des sciences de l'univers
5 LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac]
6 UB - Université Sciences et Technologies - Bordeaux 1
7 L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux
8 CALTECH - California Institute of Technology
9 CBK - Space Research Centre of Polish Academy of Sciences
10 CfA - Harvard-Smithsonian Center for Astrophysics
11 LOCIE - LabOratoire proCédés énergIe bâtimEnt
12 CSIC - Centro de Investigaciones Biológicas
13 Instituut voor Sterrenkunde [Leuven]
14 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
15 ESO - European Southern Observatory
16 UNIBE - Universität Bern / University of Bern
17 OAA - INAF - Osservatorio Astrofisico di Arcetri
18 LAOG - Laboratoire d'Astrophysique de Grenoble
19 MPIFR - Max-Planck-Institut für Radioastronomie
20 IRAM - Instituto de RadioAstronomía Milimétrica

We report on the initial analysis of Herschel/HIFI carbon monoxide (CO) observations of the Martian atmosphere performed between 11 and 16 April 2010. We selected the (7-6) rotational transitions of the isotopes ^{13}CO at 771 GHz and C^{18}O at 768 GHz in order to retrieve the mean vertical profile of temperature and the mean volume mixing ratio of carbon monoxide. The derived temperature profile agrees within less than 5 K with general circulation model (GCM) predictions up to an altitude of 45 km, however, show about 12-15 K lower values at 60 km. The CO mixing ratio was determined as 980 \pm 150 ppm, in agreement with the 900 ppm derived from Herschel/SPIRE observations in November 2009.

Mots clés: Astrophysics; Earth and Planetary Astrophysics

Domaines: Planétologie et astrophysique de la terre [astro-ph.EP]; Planétologie et astrophysique de la terre [astro-ph.EP]

P. Hartogh, M. I. Błęcka, C. Jarchow, H. Sagawa, E. Lellouch, et al.. First results on Martian carbon monoxide from Herschel/HIFI observations. Astronomy and Astrophysics - A&A, 2010, 521, pp.id.L48. ⟨10.1051/0004-6361/201015159⟩. ⟨hal-00520817⟩