Terrestrial planet formation in a circumbinary disc around a coplanar binary
Terrestrial planet formation in a circumbinary disc around a coplanar binary
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DOI：
10.1093/mnras/stab2419
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发表时间：
2021-08
影响因子：
4.8
通讯作者：
Anna C. Childs;R. Martin
中科院分区：
文献类型：
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作者：
Anna C. Childs;R. Martin
与N体模拟，我们模拟陆地环双星行星（CBP）的形成与流体动力学环双星气盘模拟激发的初始表面密度分布。双星在形成天体的初始分布中起着重要的作用。在气盘消散后，双星的扭矩通过促进天体间的相互作用加速了行星的形成过程，但也促使行星建筑材料在早期从系统中喷出。与单颗星星系统相比，在近距离双星系统周围形成的行星数量更少，但质量更大。一个足够宽或偏心的双星可能会阻止类地行星的形成。偏心双星和外部巨行星加剧了这些影响，因为它们都减少了稳定轨道的径向范围。然而，有了足够大的稳定区域，形成的行星质量更大，更偏心，更倾斜。在我们所有的模拟中，巨行星都保持在稳定的轨道上，这表明巨行星一旦形成，就会在行星系统中长期存在。
With N-body simulations, we model terrestrial circumbinary planet (CBP) formation with an initial surface density profile motivated by hydrodynamic circumbinary gas disc simulations. The binary plays an important role in shaping the initial distribution of bodies. After the gas disc has dissipated, the torque from the binary speeds up the planet formation process by promoting body–body interactions but also drives the ejection of planet building material from the system at an early time. Fewer but more massive planets form around a close binary compared to a single star system. A sufficiently wide or eccentric binary can prohibit terrestrial planet formation. Eccentric binaries and exterior giant planets exacerbate these effects as they both reduce the radial range of the stable orbits. However, with a large enough stable region, the planets that do form are more massive, more eccentric, and more inclined. The giant planets remain on stable orbits in all our simulations suggesting that giant planets are long-lived in planetary systems once they are formed.