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arXiv 2202.01530astro-ph.EP
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太阳系早期冰冷柯伊伯带天体热演化中的蛇纹石化作用

Serpentinization in the thermal evolution of icy Kuiper belt objects in the early Solar system

Anikó Farkas-Takács, Csaba Kiss, Sándor Góbi, Ákos Kereszturi

备注：
Accepted for publication in the Planetary Science Journal
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摘要：

本文提出了一种改进的算法来模拟太阳系早期星子的蛇形化过程。虽然人们假设类蛇纹化反应在星子的热演化中起着重要的作用，但在这一主题中可用的模型很少且有限。这些过程可能很重要，因为这些物体中所涉及的材料很丰富。我们的模型基于（Gobi & Kereszturi 2017）的模型，并在考虑热容和岩石圈压力以及计算界面水量方面进行了改进。将我们的结果与以前的计算结果进行比较表明，在例如蛇纹化时间（在特定初始条件下消耗大部分反应物所需的时间）或该过程产生的热量方面存在显着差异。在一个简单的应用程序中，我们表明，在冰冷的机构，在一些现实的条件下，低于水冰的熔点，使用界面水的蛇纹化反应可能能够进行，并最终推动当地的温度高于熔点开始一个'失控'蛇纹化。根据我们对半径为R $\gtrsim$ 200公里的天体的计算，在早期的太阳系中，蛇纹化作用可能迅速地改造了这些天体的几乎整个内部。

英文摘要：

Here we present an improved algorithm to model the serpentinization process in planetesimals in the early Solar system. Although it is hypothesized that serpentinization-like reactions played an important role in the thermal evolution of planetesimals, few and restricted models are available in this topic. These processes may be important as the materials involved were abundant in these objects. Our model is based on the model by (Gobi & Kereszturi 2017), and contains improvements in the consideration of heat capacities and lithospheric pressure, and in the calculation of the amount of interfacial water. Comparison of our results with previous calculations shows that there are significant differences in the e.g. the serpentinization time -- the time necessary to consume most of the reactants at specific initial conditions -- or the amount of heat produced by this process. In a simple application we show that in icy bodies, under some realistic conditions, below the melting point of water ice, serpentinization reaction using interfacial water may be able to proceed and eventually push the local temperature above the melting point to start a 'runaway' serpentinization. According to our calculations in objects with radii R $\gtrsim$ 200 km serpentinization might have quickly reformed nearly the whole interior of these bodies in the early Solar system.

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