arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2302.10752astro-ph.EP
收藏

共面的环联星行星在有内极行星存在的情况下,可能会不稳定到大的倾斜振荡

Coplanar circumbinary planets can be unstable to large tilt oscillations in the presence of an inner polar planet

Anna C. Childs, Rebecca G. Martin, Stephen Lepp, Stephen H. Lubow, Aaron M. Geller

摘要:

相互错位的环联行星可能形成于扭曲或破裂的气体盘中,或者来自后来的行星与行星的相互作用。通过数值模拟和分析估计,我们探索了两个相互倾斜的环双星行星的动力学。共面的内行星会导致双星的近点进动,外行星轨道半径越大,外行星的静止倾角越大。在这种情况下,共面的外行星总是保持共面。另一方面,一个极内行星导致逆行拱点岁差的双星轨道和静止倾角较小的较大的外行星轨道半径。对于一系列的外行星半长轴,一个最初的共面轨道是振动的,这意味着外行星经历了大的倾斜振荡。高度倾向于双星的环联行星很难被探测到--在存在极内行星的情况下,行星的倾角不太可能低于凌日探测极限。这些结果表明,可能有一群环联星行星正在经历大的倾斜振荡。

英文摘要:

Mutually misaligned circumbinary planets may form in a warped or broken gas disc or from later planet-planet interactions. With numerical simulations and analytic estimates we explore the dynamics of two circumbinary planets with a large mutual inclination. A coplanar inner planet causes prograde apsidal precession of the binary and the stationary inclination for the outer planet is higher for larger outer planet orbital radius. In this case a coplanar outer planet always remains coplanar. On the other hand, a polar inner planet causes retrograde apsidal precession of the binary orbit and the stationary inclination is smaller for larger outer planet orbital radius. For a range of outer planet semi-major axes, an initially coplanar orbit is librating meaning that the outer planet undergoes large tilt oscillations. Circumbinary planets that are highly inclined to the binary are difficult to detect -- it is unlikely for a planet to have an inclination below the transit detection limit in the presence of a polar inner planet. These results suggest that there could be a population of circumbinary planets that are undergoing large tilt oscillations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑