Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...403l...7f&link_type=abstract
Astronomy and Astrophysics, v.403, p.L7-L10 (2003)
Astronomy and Astrophysics
Astrophysics
3
Line: Formation, Radiative Transfer, Planets And Satellites: Individual: Neptune, Infrared: Solar System
Scientific paper
The infrared spectrum of Neptune at 3.5-3.75 mu m and 3.87-4.1 mu m has been measured at a spectral resolution of 1200. The observed flux is stronger by a factor ~ 3 compared to previous measurements, suggesting important meteorological variations between 1997 and 2002. The flux is detected mostly from a bright belt at mid-southern latitudes. Strong absorptions, identified as methane, are observed over the L band. The observed CH_4 spectrum can be fitted by a multilayer model assuming that the solar light is partly reflected above several layers, including the CH_4 haze and stratospheric photochemical hazes. An upper limit to a disk averaged column density of H3+ of 2.9 (+7.1/-1.8)*E10 cm-2 is reported, consistent with present ionospheric models.
Based on observations obtained at the European Southern Observatory, Paranal, Chile, within the observing program 70.C-0004(A).
Encrenaz Th.
Feuchtgruber Helmut
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