1996•University of Groningen research database (University of Groningen / Centre for Information Technology)Requires access
First Results of ISO-SWS Grating Observations of Jupiter
Th. Encrenaz, Th. de Graauw, S. Schaeidt, E. Lellouch, H. Feuchtgruber, D. A. Beintema, Bruno Bézard, P. Drossart, Matt Griffin, A. M. Heras, Martin Kessler, K. Leech, Andrew George Morris, Pieter R. Roelfsema, Maarten Roos‐Serote, A. Salama, Bart K. Vandenbussche, Edwin A. Valentijn, G. R. Davies, David A. Naylor
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Abstract
The spectrum of Jupiter has been recorded on April 12, 1996, between 2.75 and 14.5 mu m, with the grating mode of the Short-Wavelength Spectrometer of ISO (Infrared Space Observatory). The resolving power is 1500 and the sensitivity limit is better than 1 Jy. The corresponding S/N ratio is better than 1000 at 2.75 mu m, 4000 at 5 mu m and 20000 at 12 mu m. The main preliminary results of the grating observations are (1) at 3 mu m, the first spectroscopic signature, probably associated with NH_3 ice, of the Jovian cloud at 0.5 bar and (2) the first detection of a thermal emission at the center of the CH_4 nu_3 band at 3.3 mu m, showing evidence for a high temperature in the upper jovian stratosphere (about T=800 K at P=0.16 mu bar). A modelling of the whole spectral range will be presented, with implications on the jovian thermal profile and on the mixing ratios and/or vertical distributions of the atmospheric constituents. A preliminary analysis of these data can be found in Encrenaz et al (submitted to Astron. Astrophys., 1996).