The spectrum of Titan in the 5-micron window

Details The spectrum of Titan in the 5-micron window The spectrum of Titan in the 5-micron window

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....10776l&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #10776

Physics

Scientific paper

The 5-μm region is known to be a window probing Titan's lower atmosphere and surface. In November 2000, we obtained mid-resolution observations of Titan in 4.75-5.07 μm with the VLT/ISAAC instrument. The main results (Lellouch et al. Icarus, in press, 2003) were: (i) the clear detection of individual CO absorption lines, enabling a determination of the CO/N_2 mixing ratio in Titan's atmosphere (32±10 ppm) (ii) the confirmation of a low (about 0.06) geometric albedo in the 5 μm continuum (iii) the detection of non-zero continuum flux at 4.75-4.85 μm, providing evidence for haze scattering (iv) the detection of a few emission features, attributed to fluorescence in the CO(2-1) lines. As a continuation of this program, Titan was reobserved with ISAAC/VLT during the 2002-2003 opposition. The main goals are two-fold: (1) search for orbital variability of the 5 μm continuum as a possible surface diagnostic (2) extend the spectral range to ˜4.55 μm for further characterizing and investigating the emission lines. First results will be presented.

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