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Near-infrared Brightness of the Galilean Satellites Eclipsed in Jovian Shadow: A New Technique to Investigate Jovian Upper Atmosphere

Tsumura, K. and Arimatsu, K. and Egami, E. and Hayano, Y. and Honda, C. and Kimura, J. and Kuramoto, K. and Matsuura, S. and Minowa, Y. and Nakajima, K. and Nakamoto, T. and Shirahata, M. and Surace, J. and Takahashi, T. and Wada, T. (2014) Near-infrared Brightness of the Galilean Satellites Eclipsed in Jovian Shadow: A New Technique to Investigate Jovian Upper Atmosphere. Astrophysical Journal, 789 (2). Art. No. 122. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20140807-135651114

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Abstract

Based on observations from the Hubble Space Telescope and the Subaru Telescope, we have discovered that Europa, Ganymede, and Callisto are bright around 1.5 μm even when not directly lit by sunlight. The observations were conducted with non-sidereal tracking on Jupiter outside of the field of view to reduce the stray light subtraction uncertainty due to the close proximity of Jupiter. Their eclipsed luminosity was 10^(–6)-10^(–7) of their uneclipsed brightness, which is low enough that this phenomenon has been undiscovered until now. In addition, Europa in eclipse was <1/10 of the others at 1.5 μm, a potential clue to the origin of the source of luminosity. Likewise, Ganymede observations were attempted at 3.6 μm by the Spitzer Space Telescope, but it was not detected, suggesting a significant wavelength dependence. It is still unknown why they are luminous even when in the Jovian shadow, but forward-scattered sunlight by hazes in the Jovian upper atmosphere is proposed as the most plausible candidate. If this is the case, observations of these Galilean satellites while eclipsed by the Jovian shadow provide us with a new technique to investigate the Jovian atmospheric composition. Investigating the transmission spectrum of Jupiter by this method is important for investigating the atmosphere of extrasolar giant planets by transit spectroscopy.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1405.5280arXivDiscussion Paper
http://iopscience.iop.org/0004-637X/789/2/122PublisherArticle
http://dx.doi.org/http://iopscience.iop.org/0004-637X/789/2/122DOIArticle
ORCID:
AuthorORCID
Surace, J.0000-0001-7291-0087
Additional Information:© 2014 American Astronomical Society. Received 2014 March 25; accepted 2014 May 20; published 2014 June 20. This research is based on observations made with these instruments: the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan and associated with programs S12A-022, S13B-115 and S14A-080; the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute (STScI), which is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555, associated with program #12980; and the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory (JPL), California Institute of Technology under a contract with NASA, associated with program #80235 and #90143. This work was supported by the Japan Society for the Promotion of Science, KAKENHI (#24111717, #26800112), and NASA through a grant from STScI and JPL.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASANAS 5-26555
NASA/JPL/CaltechUNSPECIFIED
Japan Society for the Promotion of Science (JSPS)24111717
Japan Society for the Promotion of Science (JSPS)26800112
Space Telescope Science InstituteUNSPECIFIED
Subject Keywords:atmospheric effects; eclipses; planets and satellites: individual (Jupiter, Europa, Ganymede, Callisto)
Issue or Number:2
Record Number:CaltechAUTHORS:20140807-135651114
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140807-135651114
Official Citation:Near-infrared Brightness of the Galilean Satellites Eclipsed in Jovian Shadow: A New Technique to Investigate Jovian Upper Atmosphere K. Tsumura et al. 2014 ApJ 789 122
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48191
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:07 Aug 2014 21:15
Last Modified:03 Oct 2019 07:01

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