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arXiv 2107.07529astro-ph.EP
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远近隐藏行星:已知行星系隐藏伴星的参数空间

Hiding Planets Near and Far: The Parameter Space of Hidden Companions for Known Planetary Systems

Thea Faridani, Smadar Naoz, Lingfeng Wei, Will M. Farr

摘要:

最近的地面和太空观测表明,拥有多颗行星的恒星在银河系中很常见。大多数这些观测方法都偏向于探测靠近其宿主恒星的大型行星。由于这些观测偏差,这些系统可以隐藏小的,近距离的行星或远轨道(大或小)的同伴。这些行星仍然可以对已知的行星施加动力学影响,并反过来对它们施加这种影响。在某些配置中,这种影响会使系统不稳定;在其他配置中,恒星的引力影响反而会进一步稳定系统。例如,在行星离主星很近的系统中,广义相对论产生的效应可以帮助稳定结构。我们推导出隐藏的行星轨道超出和已知的行星,量化如何强烈的广义相对论效应可以稳定系统,否则将是不稳定的标准。作为概念验证,我们研究了基于开普勒56的系统中的几颗行星,并表明即使在高偏心率下,最外层的行星也不会破坏系统,并表明如果轨道低于0.08 au,则地球半径的行星可以在这个系统中稳定。此外,我们提供了具体的预测已知的观测系统,通过约束可能隐藏的行星的参数空间。

英文摘要:

Recent ground and space-based observations show that stars with multiple planets are common in the galaxy. Most of these observational methods are biased toward detecting large planets near to their host stars. Because of these observational biases, these systems can hide small, close-in planets or far-orbiting (big or small) companions. These planets can still exert dynamical influence on known planets and have such influence exerted upon them in turn. In certain configurations, this influence can destabilize the system; in others, the star's gravitational influence can instead further stabilize the system. For example, in systems with planets close to the host star, effects arising from general relativity can help to stabilize the configuration. We derive criteria for hidden planets orbiting both beyond and within known planets that quantify how strongly general relativistic effects can stabilize systems that would otherwise be unstable. As a proof-of-concept, we investigate the several planets in a system based on Kepler 56, and show that the outermost planet will not disrupt the system even at high eccentricities, and show that an Earth-radius planet could be stable within this system if it orbits below 0.08 au. Furthermore, we provide specific predictions to known observed systems by constraining the parameter space of possible hidden planets.

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。

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