Query : 2003A&A...403L...7F

2003A&A...403L...7F - Astronomy and Astrophysics, volume 403, L7-10 (2003/5-3)

The infrared spectrum of Neptune at 3.5-4.1 microns: Search for H3+ and evidence for recent meteorological variations.


Abstract (from CDS):

The infrared spectrum of Neptune at 3.5-3.75µm and 3.87-4.1µm 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 CH4 spectrum can be fitted by a multilayer model assuming that the solar light is partly reflected above several layers, including the CH4 haze and stratospheric photochemical hazes. An upper limit to a disk averaged column density of H3+ of 2.9(+7.1-1.8)x1010.cm–2 is reported, consistent with present ionospheric models.

Abstract Copyright:

Journal keyword(s): line: formation - radiative transfer - planets and satellites: individual: Neptune - infrared: solar system

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 HD 205905 PM* 21 39 10.1509511673 -27 18 23.662643353   7.36 6.74     G1.5IV-V 96 0
2 HD 214080 V* 22 36 06.4357076856 -16 23 16.760720868 6.00 6.81 6.93 6.99 7.06 B1/2Ib 138 0

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