Catastrophic disruption of icy bodies with sub-surface oceans

Catastrophic disruption of icy bodies with sub-surface oceans
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地下海洋对冰体的灾难性破坏

DOI:
10.1016/j.icarus.2019.113457
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发表时间:
2020
期刊:
影响因子:
3.2
通讯作者:
Burchell M
Burchell M
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Burchell M

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太阳系外的几个冰体有着广阔的内部海洋。在一些天体中,海洋被认为是如此广泛,以至于内部核心与冰面分离。在太阳系中,一个主要的进化驱动力是高速撞击-这会导致目标物体的撞击坑甚至破坏。在这里,我们考虑内部海洋的存在如何改变破坏具有内部海洋的冰体所需的能量密度。我们发现,在分米尺度物体的实验室实验中,导致破裂的能量密度为16.25 ± 1.35 J kg−1,而固体冰体的能量密度为18.0 ± 0.7 J kg− 1。这表明,为了撞击的目的,物体的行为就像是具有相同密度的固体。因此,预测这些冰体的寿命不受撞击破坏的影响,不需要考虑海洋内部。
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−1for 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.
外太阳系的陨石坑发生率
DOI: --
发表时间: 1999
期刊:
影响因子: --
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发表时间: 2016
影响因子: 5.2
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