半人马座阿尔法星B附近类地行星的形成和可探测性
Formation and Detectability of Terrestrial Planets Around Alpha Centauri B
摘要：
我们模拟了半人马座阿尔法星B周围行星系统的形成。一个1/r盘的N-体吸积演化与400-900个月球质量的原行星，其次是2亿年。所有的模拟都导致了多行星系统的形成，其中至少有一颗行星的质量在0.5-1.5 AU的1-2 MEarth范围内。我们研究我们的模拟行星系统的可探测性，通过生成合成径向速度观测，包括噪声的径向速度残差的基础上，最近发表的三颗行星适合附近的K 0 V星HD 69830。使用这些合成观测，我们发现，我们可以可靠地检测到一个1.8 MEarth行星在宜居带的半人马座阿尔法B后，只有三年的高节奏观测。我们还发现，即使径向速度精度为3 m/s，只要噪声谱是白色的，行星是可检测的。我们的研究结果表明，我们在半人马座阿尔法星系中探测岩石行星的能力的最大不确定性是超低频恒星噪声的未知幅度。
英文摘要：
We simulate the formation of planetary systems around Alpha Centauri B. The N-body accretionary evolution of a 1/r disk populated with 400-900 lunar-mass protoplanets is followed for 200 Myr. All simulations lead to the formation of multiple-planet systems with at least one planet in the 1-2 MEarth mass range at 0.5-1.5 AU. We examine the detectability of our simulated planetary systems by generating synthetic radial velocity observations including noise based on the radial velocity residuals to the recently published three planet fit to the nearby K0V star HD 69830. Using these synthetic observations, we find that we can reliably detect a 1.8 MEarth planet in the habitable zone of Alpha Centauri B after only three years of high cadence observations. We also find that the planet is detectable even if the radial velocity precision is 3 m/s, as long as the noise spectrum is white. Our results show that the greatest uncertainty in our ability to detect rocky planets in the Alpha Centauri system is the unknown magnitude of ultra-low frequency stellar noise.
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