通过气动漂移形成紧密堆积内行星系统
The Formation of Systems with Tightly-packed Inner Planets (STIPs) via Aerodynamic Drift
摘要：
NASA的开普勒任务揭示了大量具有紧密排列的内部行星（STIPs）的系统。目前的行星形成模式表明，由于空气动力学阻力，小微行星将迅速螺旋进入宿主恒星，阻止岩石行星形成。相比之下，我们发现，空气动力学漂移，当作用于一个整体的固体，可以集中质量在短的轨道周期在气体磁盘。升华前沿可能会进一步帮助这一过程。开普勒望远镜的数据表明，已知的最里面的行星是在硅酸盐升华带附近发现的。由于空气动力学漂移和H2解离驱动的气体吸积，STIP行星应该具有广泛的挥发性组分。我们进一步提出，火星的低质量是太阳系曾经是原STIP的证据。
英文摘要：
The NASA Kepler mission has revealed an abundant class of Systems with Tightly-packed Inner Planets (STIPs). The current paradigm for planet formation suggests that small planetesimals will quickly spiral into the host star due to aerodynamic drag, preventing rocky planet formation. In contrast, we find that aerodynamic drift, when acting on an ensemble of solids, can concentrate mass at short orbital periods in gaseous disks. Sublimation fronts may further aid this process. Kepler data suggest that the innermost known planets are found near the silicate sublimation zone. STIP planets should have a wide range of volatile fractions due to aerodynamic drift and H2 dissociation-driven gas accretion. We further propose that the low mass of Mars is evidence that the Solar System was once a proto-STIP.
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