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Hot CH_4 in the polar regions of Jupiter

Kim, Sang Joon and Sim, Chae Kyung and Ho, Jin and Geballe, Thomas R. and Yung, Yuk L. and Miller, Steve and Kim, Yong Ha (2015) Hot CH_4 in the polar regions of Jupiter. Icarus, 257 . pp. 217-220. ISSN 0019-1035.

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We have obtained 3.3–3.4-μm spectro-images of Jupiter including CH_4 and H_3^+ emission lines from both polar regions at the Gemini North telescope. We find that the peak of the 3-μm CH_4 northern bright spot is located at ∼200° (SysIII) longitude, ∼20° west of the center of the 8-μm north-polar bright spot, and does not coincide with the 3-μm H_3^+ bright spot. We derive high temperatures (500–850 K) from CH_4 rotational lines on the bright spots of both polar regions, above the 1-μbar pressure level, while we find cooler temperatures (<350 K) over the 8-μm spot. The intensity ratios of the various 3-μm vibrational bands of CH4 are roughly constant, indicating that the upper states of these bands are mostly populated by non-thermal excitation mechanisms, such as auroral particle precipitation and/or Joule heating, in contrast with the 8-μm thermal emission.

Item Type:Article
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Yung, Yuk L.0000-0002-4263-2562
Alternate Title:Hot CH4 in the polar regions of Jupiter
Additional Information:© 2015 Elsevier. Received 19 January 2015; Revised 27 March 2015; Accepted 7 May 2015; Available online 15 May 2015. This paper is based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina). SJK acknowledges support from the Brain Korea 21 Plus (BK21+) program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology, and from the Korean Astronomy & Space Science Institute under the R&D program supervised by the Ministry of Science, ICT and Future Planning.
Funding AgencyGrant Number
National Research Foundation of KoreaUNSPECIFIED
Korean Astronomy & Space Science InstituteUNSPECIFIED
Subject Keywords:Jupiter; Spectroscopy; Aurorae; Infrared observations; Atmospheres, composition
Record Number:CaltechAUTHORS:20150813-122731563
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Official Citation:Sang Joon Kim, Chae Kyung Sim, Jin Ho, Thomas R. Geballe, Yuk L. Yung, Steve Miller, Yong Ha Kim, Hot CH4 in the polar regions of Jupiter, Icarus, Volume 257, 1 September 2015, Pages 217-220, ISSN 0019-1035, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59495
Deposited By: George Porter
Deposited On:13 Aug 2015 20:07
Last Modified:09 Mar 2020 13:19

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