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Catastrophic disruption of icy bodies with sub-surface oceans

Burchell, M.J., Landers, K., Harriss, K.H., Price, M.C. (2020) Catastrophic disruption of icy bodies with sub-surface oceans. Icarus, 336 . Article Number 113457. ISSN 0019-1035. (doi:10.1016/j.icarus.2019.113457) (KAR id:78653)

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Several icy bodies in the outer Solar system have extensive internal oceans. In several bodies the oceans are believed to be so extensive they decouple the interior core from the icy surface. A major evolutionary driver in the Solar System is high speed impacts – which lead to cratering or even disruption of the target body. Here we consider how the presence of an internal ocean modifies the energy density needed to disrupt an icy body with an internal ocean. We find that in laboratory experiments on decimetre scale bodies, the energy density to cause disruption is 16.25 ± 1.35 J kg−1, compared to 18.0 ± 0.7 J kg−1 for solid ice bodies. This suggests that for the purposes of impacts the bodies behave as if a solid with the same density. Predictions of the lifetimes of such icy bodies against impact disruption thus need not take the interior ocean into account.

Item Type: Article
DOI/Identification number: 10.1016/j.icarus.2019.113457
Uncontrolled keywords: Ices, Satellites (general), Impact processes, Europa, Enceladus
Divisions: Divisions > Division of Natural Sciences > School of Physical Sciences
Depositing User: Mark Burchell
Date Deposited: 13 Nov 2019 11:28 UTC
Last Modified: 16 Feb 2021 14:09 UTC
Resource URI: (The current URI for this page, for reference purposes)
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