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We report the detection of benzene (c-C 6 H 6 ) in the upper atmospheres of Jupiter at midlatitudes and Saturn (disk average). Observations with the Short-Wavelength Spectrometer of the Infrared Space Observatory reveal emission from the Q-branch of benzene around 14.84 μm on these two planets but not on Uranus and Neptune. Column densities have been derived through radiative transfer...
We present the results of the Infrared Space Observatory Short Wavelength Spectrometer (ISO-SWS) observations of Jupiter related to ammonia. We focus on two spectral regions; the first one (the 10-μm region), ranging from 9.5 to 11.5 μm, probes atmospheric levels between 1 and 0.2 bar, while the second one (the 5-μm window), ranging from 4.8 to 5.5 μm, sounds the atmosphere between 8 and 2 bar. The...
High temperature chemistry in the fireballs created by the impacts of Comet P/Shoemaker-Levy 9 in Jupiter has been studied using thermochemical models of the impacts. Explosions of the fragments at different levels in the jovian atmosphere ranging from above the clouds of NH 3(s) to below the clouds of H 2 O (s) have been considered. The chemical composition...
A new distribution of phosphorus compounds in the atmosphere of Jupiter is given, using revised values for the chemical constants. In contrast with previous works, it is shown that phosphine PH 3 remains the most abundant equilibrium gaseous compound even at the upper levels of Jupiter's troposphere. The observed PH 3 abundance is equal to the equilibrium value, at all temperatures...