论文标题
影响诱导的大气竖井交换设置了原始地球上的挥发性元素比率
Impact Induced Atmosphere-Mantle Exchange Sets the Volatile Elemental Ratios on Primitive Earths
论文作者
论文摘要
传统的行星形成理论表明，软骨材料已将至关重要的大气和水层元素（例如碳（C），氮（N）和氢（H）等元素传递到原始地球上。但是，最近的测量值强调了陆地母体与所谓的行星构建块之间的显着元素比率差异。在这里，我们提出了在地球和地球状行星组装过程中的挥发性进化模型。我们的模型包括影响损失，大气层交换以及从动态建模结果计算出的积聚和超过味道的时间依赖性效果。探索广泛的行星特性（即尺寸和成分）以及由N体积聚模拟所通知的历史记录，我们发现CNH分级程度具有固有的随机性，但可以追溯到Protoplanet和弹丸和弹药型的某些特性。有趣的是，我们的大多数地球样行星都获得了超管的最终C/N比率，这表明陆地行星上的挥发性元素比是由递送，大气消融和地幔脱胶之间的复杂相互作用驱动的。
Conventional planet formation theory suggests that chondritic materials have delivered crucial atmospheric and hydrospheric elements such as carbon (C), nitrogen (N), and hydrogen (H) onto primitive Earth. However, recent measurements highlight the significant elemental ratio discrepancies between terrestrial parent bodies and the supposed planet building blocks. Here we present a volatile evolution model during the assembly of Earth and Earth-like planets. Our model includes impact losses, atmosphere-mantle exchange, and time dependent effects of accretion and outgassing calculated from dynamical modeling outcomes. Exploring a wide range of planetesimal properties (i.e., size and composition) as well as impact history informed by N-body accretion simulations, we find that while the degree of CNH fractionation has inherent stochasticity, the evolution of C/N and C/H ratios can be traced back to certain properties of the protoplanet and projectiles. Interestingly, the majority of our Earth-like planets acquire superchondritic final C/N ratios, implying that the volatile elemental ratios on terrestrial planets are driven by the complex interplay between delivery, atmospheric ablation, and mantle degassing.
