论文标题
Scardoni等人对“ II型迁移罢工 - 碟片迁移的旧范式”的评论
Comments on "Type II migration strikes back -- An old paradigm for planet migration in discs" by Scardoni et al
论文作者
论文摘要
从常规的II型迁移视图中，一个巨大的行星在所谓的盘式符号情况下以积聚盘的粘性速度向内迁移。然而，最近的流体动力模拟表明，行星的速度迁移速度要比大型圆盘中的粘性快得多。这种快速的迁移无法通过传统图片来解释。 Scardoni等。 （2020年）最近争论了这张新图片。通过进行类似的流体动力模拟，他们发现迁移速度随着时间而变慢，并最终通过常规理论达到了预测。他们将快速迁移解释为初始瞬态迁移，并得出结论认为，常规II型迁移是在瞬态阶段实现的。我们表明，Scardoni等人获得的迁移速度。 （2020）即使在他们提出的瞬态阶段，也与先前的模拟一致。我们还发现Scardoni等人提出的瞬态快速迁移。 （2020）由Kanagawa等人的新模型很好地描述。 （2018）。新模型可以在Scardoni等人的初始瞬态阶段适当地描述重要的内向迁移。 （2020）称为。因此，我们得出的结论是，瞬态迁移速度的时间变化是由于行星轨道半径的变化及其背景表面密度在迁移过程中。
In the conventional view of type II migration, a giant planet migrates inward in the viscous velocity of the accretion disc in the so-call disc-dominate case. Recent hydrodynamic simulations, however, showed that planets migrate with velocities much faster than the viscous one in massive discs. Such fast migration cannot be explained by the conventional picture. Scardoni et al. (2020) has recently argued this new picture. By carrying out similar hydrodynamic simulations, they found that the migration velocity slows down with time and eventually reaches the prediction by the conventional theory. They interpreted the fast migration as an initial transient one and concluded that the conventional type II migration is realised after the transient phase. We show that the migration velocities obtained by Scardoni et al. (2020) are consistent with the previous simulations even in the transient phase that they proposed. We also find that the transient fast migration proposed by Scardoni et al. (2020) is well described by a new model of Kanagawa et al. (2018). The new model can appropriately describe significant inward migration during the initial transient phase that Scardoni et al. (2020) termed. Hence, we conclude that the time-variation of the transient migration velocity is due to the changes of the orbital radius of the planet and its background surface density during the migration.
