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| Titel |
A search for SO2 on Mars from ground-based infrared spectroscopy |
| VerfasserIn |
Thérèse Encrenaz, Thomas Greathouse, Matthew Richter, Thierry Fouchet, Bruno Bézard |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048050
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| Zusammenfassung |
| In spite of the discovery of sulfur-bearing molecules at the surface of Mars by the Viking lander and the Opportunity rover, no gaseous sulfur–bearing species have ever been detected in the Martian atmosphere. Recently, stringent upper limits of 1 ppb (Krasnopolsky, 2005) and 2 ppb (Nakagawa et al. 2009) have been reported using infrared spectroscopy and heterodyne submillimeter spectroscopy respectively. We have performed a search for SO2 in the Martian atmosphere in October 2009 (Ls = 352°) using the TEXES imaging spectrometer at the Infrared Telescope Facility in the 7.3-7.4 micron spectral range. This instrument has the advantage of combining a high spectral resolving power (R=80000) and a good spatial resolution (about 1 arcsec after convolution). Strong SO2 transitions are present in the 1350–1375 cm-1. No individual transition could be identified. A preliminary analysis shows that co-adding the spectra on ten strong transitions allows us to reach an upper limit of 1 ppb or better on selected areas of the Martian disk. These results will be analysed and their implications will be discussed. |
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