AI 中文总结
该研究提出通过岩浆洋对流表面更新机制解释氢进入亚海王星核心的过程，该机制由冷却驱动，可实现核心与富氢包层的平衡，对岩浆洋-大气相互作用有普遍意义。
AI 中文摘要
本文提出了一种关于氢从富氢包层进入生长行星熔融核心的吸积机制的对流表面更新解释，特别适用于亚海王星。氢的吸积发生在移动界面处，该界面由岩浆洋的上边界构成，随着其移动，会从上方的包层中吞噬氢。这种吞噬机制是表面更新，即上部扩散边界层因对流作用被稀释。即使低密度氢的稳定浮力抵消了热驱动的不稳定浮力，表面更新仍会导致氢的吸积，该过程最终由冷却驱动。从气态盘阶段开始，当氢可视为无限供应时，亚海王星可获得足够的氢以实现全局核心-包层平衡，其结构因此与富氢超临界岩浆洋上覆盖富氢包层的情况一致。表面更新过程对一般情况下的其他岩浆洋-大气相互作用也具有重要意义。
英文摘要
A convective surface renewal explanation for ingassing of hydrogen from H2-rich envelopes into molten cores of growing planets is presented, with particular application to sub-Neptunes. The ingassing of hydrogen occurs at a moving front comprising the upper boundary of the magma ocean that engulfs hydrogen from the envelope above as it moves. The mechanism of engulfment is surface renewal as the upper diffusive boundary layer is diluted by convection. Surface renewal results in ingassing even where the stabilizing buoyancy of the low-density hydrogen neutralizes the destabilizing thermally-driven buoyancy. It is ultimately driven by cooling. Beginning during the gaseous disk phase, when hydrogen is effectively available in infinite supply, sub-Neptunes can acquire enough hydrogen to permit global core-envelope equilibrium. The structures are therefore consistent with hydrogen-rich, supercritical magma oceans overlain by hydrogen-rich envelopes. The process of surface renewal has implications for other magma ocean - atmosphere interactions in general.
Comments19 pages, 6 figures, submitted to ApJ, available for comment
