7th October 2016
Saturn's moon Dione may contain a subsurface ocean
The Cassini mission has revealed evidence of a subsurface ocean within Saturn's moon Dione.
A subsurface ocean lies deep within Saturn's moon Dione, according to new data from the Cassini spacecraft. Two other moons of the gas giant – Titan and Enceladus – are already known to hide global oceans beneath their icy crusts, but a new study suggests an ocean exists in Dione as well.
In this study, researchers from the Royal Observatory of Belgium show gravity data from recent Cassini flybys can be explained if Dione's crust floats on an ocean located 100 km (62 miles) below the surface. The ocean is several tens of kilometres deep and surrounds a large rocky core. Seen from within, Dione is similar to its smaller but more famous neighbour Enceladus, whose south polar region spurts huge jets of water vapour into space. Dione seems to be quiet now, but its broken surface bears witness of a more tumultuous past.
The researchers modelled the icy shells of Enceladus and Dione as global icebergs immersed in water, where each surface ice peak is supported by a large underwater keel. Scientists have used this approach in the past, but previous results have predicted a very thick crust for Enceladus and no ocean at all for Dione.
"As an additional principle, we assumed that the icy crust can stand only the minimum amount of tension or compression necessary to maintain surface landforms", said Mikael Beuthe, lead author of the new study. "More stress would break the crust down to pieces."
According to the new study, published in Geophysical Research Letters, Enceladus' ocean is much closer to the surface, especially near the south pole where geysers erupt through a few kilometres of crust. These findings agree well with the discovery last year that Enceladus undergoes large back-and-forth oscillations, or "libration", during its orbit. Enceladus' libration would be much smaller if its crust was thicker. As for Dione, the new study finds it contains a deep ocean between its crust and core.
"Like Enceladus, Dione librates – but below the detection level of Cassini,'' said Antony Trinh, co-author of the study. "A future orbiter hopping around Saturn's moons could test this prediction."
Dione's ocean has probably survived for the whole history of the moon, and thus offers a long-lived habitable zone for microbial life. "The contact between the ocean and the rocky core is crucial", said Attilio Rivoldini, co-author of the study. "Rock-water interactions provide key nutrients and a source of energy, both being essential ingredients for life." The ocean of Dione is too deep for easy access, but Enceladus as well as Jupiter's moon Europa are generous enough to eject water samples in space, ready to be captured by a passing spacecraft.
The club of "ocean worlds" – icy moons or planets with subsurface oceans in common parlance – is gaining new members with each new mission to the outer Solar System. Three ocean worlds orbit Jupiter, three orbit Saturn, and Pluto could also belong to the club, according to recent observations of the New Horizons spacecraft. The approach to modelling planetary bodies used in this study is a promising tool to study these worlds if we can measure their shape and gravity field, according to Mikael Beuthe. "Future missions will visit Jupiter's moons, but we should also explore Uranus' and Neptune's systems", he said.
Cassini was launched in 1997 and has been operational since 2004. Next year, on 15th September 2017, its 20-year mission will end as it plunges into Saturn's hydrogen and helium atmosphere.
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