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Publication Detail
New limits on H+(3) abundance on Neptune using Keck NIRSPEC
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Melin H, Stallard T, Miller S, Lystrup MB, Trafton LM, Booth TC, Rivers C
  • Publisher:
    WILEY-BLACKWELL PUBLISHING, INC
  • Publication date:
    01/01/2011
  • Pagination:
    641, 644
  • Journal:
    MON NOT R ASTRON SOC
  • Volume:
    410
  • Issue:
    1
  • Print ISSN:
    0035-8711
  • Language:
    EN
  • Keywords:
    techniques: spectroscopic, planets and satellites: atmospheres, planets and satellites: aurorae, planets and satellites: composition, planets and satellites: individual: Uranus, planets and satellites: individual: Neptune, ULTRAVIOLET SPECTROMETER OBSERVATIONS, H-3(+) EMISSION, URANUS, TEMPERATURE, SATURN, ATMOSPHERE, MOLECULE, JUPITER, AURORA, H-3+
  • Addresses:
    Melin, H
    Univ Leicester
    Dept Phys & Astron
    Leicester
    LE1 7RH
    Leics
    England
Abstract
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 similar to 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))x 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 similar to 2, whereas previous observations had noted the solar reflection as being brighter on the Southern hemisphere.
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