Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mnras.410..641m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 410, Issue 1, pp. 641-644.
Astronomy and Astrophysics
Astronomy
1
Techniques: Spectroscopic, Planets And Satellites: Atmospheres, Planets And Satellites: Aurorae, Planets And Satellites: Composition, Planets And Satellites: Individual: Uranus, Planets And Satellites: Individual: Neptune
Scientific paper
Neptune and Uranus are observed with Keck II NIRSPEC in an attempt to detect H+3 emission from Neptune. In this set of observations, H+3 emission remains undetected at Neptune, whereas line-resolved emission from Uranus was observed with a signal-to-noise ratio of ˜100. Using this, we have derived an upper limit of the column-integrated H+3 density on Neptune of 1.5 (+4.8-0.9)× 1013 m-2, assuming a temperature of 550±100 K. This value improves the previous established limit by a factor of 20 and shows that the H+3 density predicted by the best available model overestimate the density by at least a factor of 3.
In addition, the solar reflection continuum of Neptune in the K and L' bands is seen to be brighter on the Northern hemisphere by a factor of ˜2, whereas previous observations had noted the solar reflection as being brighter on the Southern hemisphere.
Booth T. C.
Lystrup Makenzie B.
Melin Henrik
Miller Samantha
Rivers C.
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