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Title: Detection of H3+ auroral emission in Jupiter’s 5-micron window
Authors: Giles, R. S.
Fletcher, Leigh Nicholas
Irwin, P. G. J.
Melin, Henrik
Stallard, Tom S.
First Published: 2016
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics (Accepted, In Press)
Abstract: We use high-resolution ground-based observations from the VLT CRIRES instrument in December 2012 to identify sixteen previously undetected H 3 + emission lines from Jupiter’s ionosphere. These emission lines are located in Jupiter’s 5-micron window (4.5-5.2 m m), an optically-thin region of the planet’s spectrum where the radiation mostly originates from the deep troposphere. The H 3 + emission lines are so strong that they are visible even against this bright background. We measure the Doppler broadening of the H 3 + emission lines in order to evaluate the kinetic temperature of the molecules, and we obtain a value of 1390 ± 160 K. We also measure the relative intensities of lines in the ν 2 fundamental in order to calculate the rotational temperature, obtaining a value of 960 ± 40 K. Finally, we use the detection of an emission line from the 2 ν 2 (2)- ν 2 overtone to measure a vibrational temperature of 925 ± 25 K. We use these three independent temperature estimates to discuss the thermodynamic equilibrium of Jupiter’s ionosphere.
ISSN: 0004-6361
eISSN: 1432-0746
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Reproduced with permission from Astronomy & Astrophysics, Copyright © ESO 2016. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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