论文标题
阳光的精确径向速度测量值的重心校正
Barycentric Corrections for Precise Radial Velocity Measurements of Sunlight
论文作者
论文摘要
在直接观察太阳的情况下，以及从太阳系对象（例如月球或小行星）的表面反射的情况下，我们提供了计算阳光的精确多普勒速度的公式。我们讨论了这些多普勒速度测量的“ barycentric校正”的含义，这与星光的类似校正是不同的程序，并提供了一种将这种测量值降低到地球方向或其他太阳能系统对象的太阳运动的公式。我们已经在公共Barycorrpy Python软件包中实施了此程序，并使用它来探索30年来阳光的Barycentric校正多普勒速度的属性。直接测量时，我们表明它是由于木星引起的非周期运动所支配的，并且包括金星在内的其他行星的信号在傅立叶空间中不可分割。我们表明，在阳光的多普勒速度中“检测”金星将需要从小行星反射中观察阳光，或者在与之相反的太阳能系统中对太阳运动的个人贡献进行建模。
We provide formulae for the calculation of precise Doppler velocities of sunlight, in both the case of direct observations of the Sun and in reflection from the surfaces of solar system objects such as the Moon or asteroids. We discuss the meaning of a "barycentric correction" of measurements of these Doppler velocities, which is a different procedure from the analogous correction for starlight, and provide a formula for reducing such measurements to the component of the Sun's motion in the direction of the Earth or other Solar System object. We have implemented this procedure in the public barycorrpy Python package, and use it to explore the properties of the barycentric-corrected Doppler velocity of sunlight over 30 years. When measured directly, we show it is dominated by the non-periodic motion due to Jupiter, and that the signals of the other planets, including Venus, are not discernible in Fourier space. We show that "detecting" Venus in the Doppler velocities of sunlight will require either observing sunlight in reflection from an asteroid, or modeling the their individual contributions to the motion of the Sun in counterfactual kinematic or dynamical simulations of the Solar System with and without them.
