论文标题
可能通过卵石积聚的天王星和海王星的原位形成
Possible in situ formation of Uranus and Neptune via Pebble Accretion
论文作者
论文摘要
天王星和海王星的起源仍然未知。特别是，在太阳星云的预期寿命内，行星形成模型在当前的径向距离内形成行星一直具有挑战性。在本文中，我们通过卵石积聚模拟天王星和海王星的原位形成，并表明这两个行星在当前位置都可以在〜3 Myr内形成，并且具有与结构模型预测的重元素与H-HE比率一致的最终组成。我们发现天王星和海王星本可以在当前的位置形成。在某些情况下，缺少几种沉重的元素，这表明天王星和/或海王星可能已经积聚了$ \ sim $ \ sim $ 1-3 m地球通过行星积聚和/或巨大冲击形成后的沉重元素。
The origin of Uranus and Neptune is still unknown. In particular, it has been challenging for planet formation models to form the planets in their current radial distances within the expected lifetime of the solar nebula. In this paper, we simulate the in-situ formation of Uranus and Neptune via pebble accretion and show that both planets can form within ~ 3 Myr at their current locations, and have final compositions that are consistent with the heavy-element to H-He ratios predicted by structure models. We find that Uranus and Neptune could have been formed at their current locations. In several cases a few earth masses of heavy elements are missing, suggesting that Uranus and/or Neptune may have accreted $\sim$1 -- 3 M Earth's mass of heavy elements after their formation via planetesimal accretion and/or giant impacts.
