论文标题
行星种群的形成II：初始磁盘尺寸和径向灰尘漂移的影响
Formation of Planetary Populations II: Effects of Initial Disk Size & Radial Dust Drift
论文作者
论文摘要
最近的ALMA观察结果表明，尽管存在各种磁盘大小，但典型的磁盘半径很小，并且径向粉尘漂移会影响磁盘中固体的分布。在这里，我们探讨了行星种群综合模型中这些特征的后果。我们模型的一个关键特征是行星陷阱 - 形成行星的I型快速迁移的障碍 - 我们包括冰线，热过渡和死区的外边缘。我们发现，冰线在温暖的木星的形成中起着基本作用。特别是，在冰线形成的超级地球与温暖的木星的比率敏感地取决于初始磁盘半径。 $ \ sim $ 50 au的初始气盘半径导致最大的超级地球种群，而较大和较小的磁盘尺寸都会导致冰线产生更多的气体巨头，附近1 AU。在各种磁盘半径上在冰线形成的典型行星类别之间的这种过渡证实，行星形成从根本上与磁盘性能（在这种情况下为磁盘尺寸）相关，并且仅在我们的模型中包括尘埃演化效应时才能看到。此外，我们发现，包括径向灰尘漂移的形成会导致形成0.1-1 Au之间的超级地球，其轨道半径比不包括灰尘演化效应的模型中产生的轨道半径较短。
Recent ALMA observations indicate that while a range of disk sizes exist, typical disk radii are small, and that radial dust drift affects the distribution of solids in disks. Here we explore the consequences of these features in planet population synthesis models. A key feature of our model is planet traps - barriers to otherwise rapid type-I migration of forming planets - for which we include the ice line, heat transition, and outer edge of the dead zone. We find that the ice line plays a fundamental role in the formation of warm Jupiters. In particular, the ratio of super Earths to warm Jupiters formed at the ice line depend sensitively on the initial disk radius. Initial gas disk radii of $\sim$50 AU results in the largest super Earth populations, while both larger and smaller disk sizes result in the ice line producing more gas giants near 1 AU. This transition between typical planet class formed at the ice line at various disk radii confirms that planet formation is fundamentally linked to disk properties (in this case, disk size), and is a result that is only seen when dust evolution effects are included in our models. Additionally, we find that including radial dust drift results in the formation of more super Earths between 0.1 - 1 AU, having shorter orbital radii than those produced in models where dust evolution effects are not included.
