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Title:
Sodium salts in E-ring ice grains from an ocean below the surface of Enceladus
Authors:
Postberg, F.; Kempf, S.; Schmidt, J.; Brilliantov, N.; Beinsen, A.; Abel, B.; Buck, U.; Srama, R.
Affiliation:
AA(Institut für Geowissenschaften, Universität Heidelberg, 69120 Heidelberg, Germany), AB(Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany), AC(Nichtlineare Dynamik, Universität Potsdam, 14476 Potsdam-Golm, Germany), AD(Department of Mathematics, University of Leicester, Leicester LEI 7RH, UK), AE(Institut für Physikalische Chemie, Universität Göttingen, 37077 Göttingen, Germany), AF(Institut für Physikalische Chemie, Universität Göttingen, 37077 Göttingen, Germany), AG(Max-Planck-Institut für Dynamik und Selbstorganisation, 37073 Göttingen, Germany), AH(Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany)
Publication:
Nature, Volume 459, Issue 7250, pp. 1098-1101 (2009). (Nature Homepage)
Publication Date:
06/2009
Origin:
NATURE
DOI:
10.1038/nature08046
Bibliographic Code:
2009Natur.459.1098P

Abstract

Saturn's moon Enceladus emits plumes of water vapour and ice particles from fractures near its south pole, suggesting the possibility of a subsurface ocean. These plume particles are the dominant source of Saturn's E ring. A previous in situ analysis of these particles concluded that the minor organic or siliceous components, identified in many ice grains, could be evidence for interaction between Enceladus' rocky core and liquid water. It was not clear, however, whether the liquid is still present today or whether it has frozen. Here we report the identification of a population of E-ring grains that are rich in sodium salts (~0.5-2% by mass), which can arise only if the plumes originate from liquid water. The abundance of various salt components in these particles, as well as the inferred basic pH, exhibit a compelling similarity to the predicted composition of a subsurface Enceladus ocean in contact with its rock core. The plume vapour is expected to be free of atomic sodium. Thus, the absence of sodium from optical spectra is in good agreement with our results. In the E ring the upper limit for spectroscopy is insufficiently sensitive to detect the concentrations we found.
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