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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.
Stallard, Tom S.
|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.|
|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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|2016giles_H3+.pdf||Post-review (final submitted)||191.08 kB||Adobe PDF||View/Open|
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