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Detection of H3+ auroral emission in Jupiter’s 5-micron window

journal contribution
posted on 2016-03-15, 12:30 authored by R. S. Giles, Leigh Nicholas Fletcher, P. G. J. Irwin, Henrik Melin, Tom S. Stallard
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.

History

Citation

Astronomy & Astrophysics, 2016, 58, A67

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Astronomy & Astrophysics

Publisher

EDP Sciences for European Southern Observatory (ESO)

issn

0004-6361

eissn

1432-0746

Acceptance date

2016-03-11

Copyright date

2016

Available date

2016-03-15

Publisher version

http://www.aanda.org/articles/aa/abs/2016/05/aa28170-16/aa28170-16.html

Language

en

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