论文标题
巨人随机影响陆地行星的内部压力
Giant impacts stochastically change the internal pressures of terrestrial planets
论文作者
论文摘要
压力是行星形成和进化的物理和化学的关键参数。先前的研究错误地假设内部压力随着身体的质量单调增加。使用平滑的颗粒流体动力学和潜在的现场方法计算，我们证明了由巨大冲击产生的热，快速旋转的物体的内部压力比同一质量的凉爽，缓慢旋转的行星要低得多。由于人体的热和旋转演化，压力随后增加。以月球形成的影响为例，我们表明碰撞后的内部压力可能不到当今地球的一半。直到地球冷却并消退到月球后，目前的压力轮廓才建立，这一过程可能在最后一次巨大的撞击之后占10秒钟。我们的工作定义了在陆地行星积聚期间压力演化的新范式：由影响驱动的随机变化。
Pressure is a key parameter in the physics and chemistry of planet formation and evolution. Previous studies have erroneously assumed that internal pressures monotonically increase with the mass of a body. Using smoothed particle hydrodynamics and potential field method calculations, we demonstrate that the hot, rapidly-rotating bodies produced by giant impacts can have much lower internal pressures than cool, slowly-rotating planets of the same mass. Pressures subsequently increase due to thermal and rotational evolution of the body. Using the Moon-forming impact as an example, we show that the internal pressures after the collision could have been less than half that in present-day Earth. The current pressure profile was not established until Earth cooled and the Moon receded, a process that may take up to 10s Myr after the last giant impact. Our work defines a new paradigm for pressure evolution during accretion of terrestrial planets: stochastic changes driven by impacts.
