Other
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30.1061f&link_type=abstract
American Astronomical Society, DPS meeting #30, #27.P05; Bulletin of the American Astronomical Society, Vol. 30, p.1061
Other
1
Scientific paper
Observations of Jupiter with ISO/SWS span from 2.5 to 12.5 mu m at a mean resolving power of 1500. First interpretations of these observations were published by Encrenaz et al., Astron. Astrophys., 1996. A complete NH_3 vertical distribution from 6 to 0.2 bar is obtained combining 5 mu m and 10 mu m spectral regions. The 5 mu m-window is well known to probe atmospheric levels down to 6-7 bars where, from weak lines of NH_3 between 2000 and 1800 cm(-1) , we retrieved a deep N/H = 1.2 x solar. This result is in agreement with findings from the Galileo Probe Net Flux Radiometer (Sromovski et al., Science, 1996) and from centimetric observations (de Pater et al., 1986). The ammonia vertical distribution in the upper troposphere is infered from the 10 mu m region. It is found to be subsaturated by a factor of 3 above 700 mbar and then rapidly removed by photo-dissociation above 300 mbar. Our resolution and high signal to noise ratio also allows us to detect several (15) NH_3 lines from which we inferred a (14) N/(15) N = 500 - 1000, thus significantly higher than the terrestrial ratio ((14) N/(15) N = 270). This discrepancy may rather reveal an isotopic frationation taking place during the condensation or photo-dissociation of ammonia in the atmosphere of Jupiter than a fractionation which occured during the formation of the solar system. Other tropospheric species of interest are observed in both the 5mu m and 10 mu m regions : CH_3D mixing ratio is derived from nu_6 (1155 cm(-1) ) and nu_2 (2200 cm(-1) ) bands, and is in agreement with the D/H ratio (2.1 10(-5) ) derived from ISO observations of HD lines (Lellouch et al., this conference). We derived a complete PH_3 distribution between 3-4 bar and 0.3 bar from nu_2 (992 cm(-1) ), nu_4 (1118 cm(-1) ) and nu_1 (2323 cm(-1) ) bands, which shows an enhancement of photo-dissociation above 0.3 bar. ISO/SWS has provided the first detection of NH_3 ice in the 3 mu m region. Brooke et al, Icarus, 1998 have obtained from this part of Jupiter spectrum a particle radius of 10 mu m. NH_3 ice also exhibits an absorption at 9.5 mu m, which is not detected in ISO/SWS observations. It allows us to infer a radius equal or larger than 10 mu m for the ice particles.
Bezard Bruno
Drossart Pierre
Encrenaz Th.
Feuchtgruber Helmut
Fouchet Th.
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