A possible explanation for the presence of crystalline H2O-ice on Kuiper Belt Objects

A possible explanation for the presence of crystalline H2O-ice on Kuiper Belt Objects
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柯伊伯带天体上存在结晶水冰的可能解释

DOI:
10.1016/j.icarus.2020.113943
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发表时间:
2020
期刊:
影响因子:
3.2
通讯作者:
Sturner, Steven J.
Sturner, Steven J.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Loeffler, Mark J.;Tribbett, Patrick D.;Cooper, John F.;Sturner, Steven J.

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在柯伊伯带天体(KBO)的多个表面上检测到结晶H2O冰似乎与科学家对这些天体表面环境的理解形成对比,因为先前的估计表明,辐射分解应该很容易使这些天体的表面在其生命周期内非晶化。在这里,我们使用一个详细的实验室方法来表明,结晶水冰可以在高达70 K的温度下由高能电子非晶化。然而,估计所需的时间完全非晶化的H2O-冰表面上的KBO探测到的深度近红外光谱只略低于太阳系的年龄。考虑到这类推断的不确定性以及在这些物体的寿命期内可能发生表面重塑事件,应该可以预期在KBO上探测到结晶或至少部分结晶的H2O冰。
The detection of crystalline H2O-ice on multiple surfaces of Kuiper Belt Objects (KBOs) seems to contrast with what scientists understand about the surface environment of these objects, as previous estimates suggest that radiolysis should have easily amorphized these objects' surface over their lifetimes. Here, we use a detailed laboratory approach to show that crystalline H2O-ice can be amorphized by energetic electrons at temperatures as high as 70 K. However, the estimated time needed to completely amorphize the H2O-ice present on the surface of a KBO to the depth probed by near-infrared spectroscopy is only slightly less than the age of the solar system. Given the uncertainties involved in these types of extrapolations and the possibility of a resurfacing event occurring in these objects lifetime, the detection of crystalline or at least partially crystalline H2O-ice on KBOs should be expected.
20 keV 质子对结晶 H2O2 的物理和化学影响。
DOI: 10.1063/1.3079612
发表时间: 2009
期刊: The Journal of chemical physics
影响因子: --
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