High-precision spectrographs can enable not only the discovery of exoplanets, but can also provide a fundamental measurement in Galactic dynamics. Over about 10 year baselines, the expected change in the line-of-sight velocity due to the Galaxy’s gravitational field for stars at ∼kiloparsec scale distances above the Galactic midplane is ∼few tens of cm s −1 , and may be detectable by the current generation of high-precision spectrographs. Here, we provide theoretical expectations for this measurement based on both static models of the Milky Way and isolated Milky Way simulations, as well from controlled dynamical simulations of the Milky Way interacting with dwarf galaxies. We simulate a population synthesis model to analyze the contribution of planets and binaries to the Galactic acceleration signal. We find that while low-mass, long-period planetary companions are a contaminant to the Galactic acceleration signal, their contribution is very small. Our analysis of ∼10 ...

中文翻译：

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直接测量银河系加速

高精度光谱仪不仅可以发现系外行星，而且可以提供银河系动力学的基本测量。在大约10年的基线之上，由于银河引力场对银河系中平面以上〜千帕尺度距离处的恒星的引力场造成的预期视线速度变化约为几十cm s -1，并且可以通过当前一代的高精度光谱仪。在这里，我们基于银河系的静态模型和孤立的银河系模拟，以及银河系与矮星系相互作用的受控动力学模拟，为这一测量提供了理论上的期望。我们模拟了一个人口综合模型，以分析行星和双星对银河加速信号的贡献。我们发现虽然质量低，长周期行星伴星是银河加速度信号的污染物，它们的贡献很小。我们对〜10 ...的分析