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First results of ISO-SWS observations of Jupiter
T. Encrenaz, Thijs de Graauw, S. Schaeidt, E. Lellouch, H. Feuchtgruber, D. A. Beintema, Bruno Bézard, P. Drossart, Matt Griffin, A. M. Heras, Martin Kessler, K. Leech, P. Morris, Pieter R. Roelfsema, Maarten Roos‐Serote, A. Salama, Bart K. Vandenbussche, Edwin A. Valentijn, G. R. Davis, D. A. Naylor
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Abstract
The spectrum of Jupiter has been recorded between 2.75 and 14.5 mu m with the grating mode of the Short-Wavelength Spectrometer (SWS) of ISO. The resolving power is 1500. The main preliminary results of this observation are (1) at 3 mu m, the first spectroscopic signature, probably associated with NH3 ice, of the Jovian cloud at 0.5 bar and (2) the first detection of a thermal emission at the center of the CH4-nu(3) band at 3.3 mu m, showing evidence for a high temperature in the upper jovian stratosphere (T=800 K at P=0.16 microbar). In addition, the R(2) HD line has been detected for the first time in Jupiter, using the Fabry-Perot (FP) mode of the SWS, with a resolving power of 31000. A preliminary analysis of the HD line indicates a D/H ratio of about 2.2 10(-5).