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Title:
The Enceladus and OH Tori at Saturn
Authors:
Johnson, R. E.; Smith, H. T.; Tucker, O. J.; Liu, M.; Burger, M. H.; Sittler, E. C.; Tokar, R. L.
Affiliation:
AA(Engineering Physics and Astronomy Department, University of Virginia, Charlottesvile, VA 22904; ), AB(Engineering Physics and Astronomy Department, University of Virginia, Charlottesvile, VA 22904; ), AC(Engineering Physics and Astronomy Department, University of Virginia, Charlottesvile, VA 22904; ), AD(Engineering Physics and Astronomy Department, University of Virginia, Charlottesvile, VA 22904; ), AE(Goddard Space Flight Center, Greenbelt, MD 20771), AF(Goddard Space Flight Center, Greenbelt, MD 20771), AG(Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545)
Publication:
The Astrophysical Journal, Volume 644, Issue 2, pp. L137-L139. (ApJL Homepage)
Publication Date:
06/2006
Origin:
UCP
ApJ Keywords:
planets and satellites: individual (Enceladus), Planets and Satellites: Individual: Saturn
DOI:
10.1086/505750
Bibliographic Code:
2006ApJ...644L.137J

Abstract

The remarkable observation that Enceladus, a small icy satellite of Saturn, is actively venting has led to the suggestion that ejected water molecules are the source of the toroidal atmosphere observed at Saturn for over a decade using the Hubble Space Telescope (HST). Here we show that the venting leads directly to a new feature, a narrow Enceladus neutral torus. The larger torus, observed using HST, is populated by charge exchange, the process that limits the lifetime of the neutrals in the Enceladus torus.
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