EDP Sciences
Free access
Issue A&A
Volume 435, Number 3, June I 2005
Page(s) 1181 - 1184
Section Planets and planetary systems
DOI http://dx.doi.org/10.1051/0004-6361:20042393

A&A 435, 1181-1184 (2005)
DOI: 10.1051/0004-6361:20042393

Research Note

High-resolution observations of Martian non-thermal CO $\mathsf{_2}$ emission near 10 $\mathsf{\mu}$m with a new tuneable heterodyne receiver

G. Sonnabend1, D. Wirtz2, V. Vetterle2 and R. Schieder2

1  NASA Goddard Space Flight Center, Greenbelt, MD, USA
    e-mail: gsonnabend@lepvax.gsfc.nasa.gov
2  Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
    e-mail: [wirtz;vetterle;schieder]@ph1.uni-koeln.de

(Received 18 November 2004 / Accepted 21 February 2005)

We present first observations with the Tuneable Heterodyne Infrared Spectrometer (THIS). This instrument developed at University of Cologne has the potential to cover the mid-infrared from 7 to 19 $\mu$m. By using heterodyne techniques and an acousto optical spectrometer (AOS) as a back-end the frequency resolution achieved is better than 107 at 10 $\mu$m. A tuneable quantum-cascade laser (QCL) is used as a local-oscillator (LO) and the instantaneous bandwidth supplied by the mercury-cadmium-telluride (MCT) detector and the AOS is 1.4 GHz. The system operates within a factor of two of the quantum limit. During December 2003 THIS was installed at the 1.5 m McMath-Pierce solar telescope on Kitt Peak/Arizona. Observations of molecular line features from the atmosphere of Mars were carried out. We present measurements of narrow non-LTE CO2 emission from the Martian atmosphere observed with a never before achieved frequency resolution of 1 MHz. The first analysis suggests zonal winds in the mesosphere of Mars in good agreement with model predictions.

Key words: techniques: spectroscopic -- planets and satellites: individual: Mars -- infrared: solar system

© ESO 2005

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Editor-in-Chief: T. Forveille
Letters Editor-in-Chief: J. Alves
Managing Editor: C. Bertout

ISSN: 0004-6361 ; e-ISSN: 1432-0746
Frequency: 12 volumes per year
Published by: EDP Sciences

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