arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1602.00658astro-ph.EP
收藏

岩石在行星蒸汽气氛中的溶解度

Solubility of Rock in Steam Atmospheres of Planets

Bruce Fegley, Nathan S. Jacobson, K. B. Williams, J. M. C. Plane, L. Schaefer, Katharina Lodders

备注：
In press in The Astrophysical Journal, 83 pages text and references, 6 tables, 30 figures
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

大量的实验研究表明，所有主要的岩石元素（Si，Mg，Fe，Ni，Ca，Al，Na，K）都或多或少地溶解在蒸汽中。我们用这些结果来计算化学平衡丰度的岩石元素轴承气体在蒸汽气氛中与硅酸盐岩浆海洋平衡。岩石元素作为挥发性氢氧化物气体进入蒸汽气氛，并通过与HF或HCl反应作为挥发性卤化物气体进入蒸汽气氛，其量比在相同温度下无挥发性固体或熔融岩石上的蒸汽压所预期的要大得多。我们通过定义气体到岩浆的分配系数来计算分数蒸发的程度，并表明地球的太阳下Si与Mg的体积元素比可能是由于原始蒸汽大气的损失。我们的结论是，正在经历或已经经历蒸汽大气逃逸的热岩系外行星可能会经历Si，Mg，Fe，Ni，Ca，Al，Na和K的部分蒸发和损失。这种损失可能会改变它们的体积组成、密度、热平衡和内部结构。

英文摘要：

Extensive experimental studies show all major rocky elements (Si, Mg, Fe, Ni, Ca, Al, Na, K) dissolve in steam to a greater or lesser extent. We use these results to compute chemical equilibrium abundances of rocky element-bearing gases in steam atmospheres equilibrated with silicate magma oceans. Rocky elements partition into steam atmospheres as volatile hydroxide gases and via reaction with HF or HCl as volatile halide gases in much larger amounts than expected from their vapor pressures over volatile-free solid or molten rock at the same temperature. We compute the extent of fractional vaporization by defining gas to magma partition coefficients and show Earth's sub-solar Si to Mg bulk elemental ratio may be due to loss of a primordial steam atmosphere. We conclude hot rocky exoplanets that are undergoing or have undergone escape of steam atmospheres may experience fractional vaporization and loss of Si, Mg, Fe, Ni, Ca, Al, Na, and K. This loss may modify their bulk composition, density, heat balance, and internal structure.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑