The Moon is believed to have formed in the aftermath of a giant impact between a planetary-mass body and the proto-Earth. In a typical giant impact scenario, a disk of vapor, liquid, and solid debris forms around the proto-Earth and—after possibly decades of evolution—condenses to form the Moon. Using state-of-the-art numerical simulations, we investigate the dynamical effects of magnetic fields on the Moon-forming giant impact. We show that turbulence generated by the collision itself, shear in the boundary layer between the post-impact debris field and the proto-Earth, and turbulence in the vapor component of the disk amplify the field to dynamically significant strengths. Magnetically driven turbulence promotes angular momentum transport in the protolunar disk. Debris material is accreted onto the proto-Earth, making Moon formation less efficient, while the disk is forced to spread to larger radii, cooling at its outer edge. Magnetic fields speed the evolution of the vapor co...

中文翻译：

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磁化的形成月球的巨大撞击

据信，月球是在行星质量物体和原始地球之间产生巨大撞击之后形成的。在典型的巨大撞击情况下，原始地球周围形成一团蒸气，液体和固体碎片，经过数十年的演化，它们凝结形成月球。使用最新的数值模拟，我们研究了磁场对月球形成的巨大撞击的动力学影响。我们表明，碰撞本身产生的湍流，撞击后碎片场与原始地球之间边界层的剪切力以及圆盘蒸气成分中的湍流将场放大为动态显着的强度。磁力驱动的湍流促进了原月盘中角动量的传输。碎片物质会积聚到原始地球上，使得月球形成效率降低，而圆盘被迫扩展到更大的半径，并在其外缘冷却。磁场加快了蒸气凝聚的演变。