A simple method to estimate radial velocity variations due to stellar activity using photometry? Activity-induced RV variations from photometry
A simple method to estimate radial velocity variations due to stellar activity using photometry? Activity-induced RV variations from photometry
复制标题
使用光度测量来估计恒星活动引起的径向速度变化的简单方法？
DOI：
10.1111/j.1365-2966.2011.19960.x
复制
发表时间：
2012
影响因子：
4.8
通讯作者：
Aigrain S
中科院分区：
文献类型：
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作者：
Aigrain S
我们提出了一种新的，简单的方法来预测活动引起的径向速度（RV）的变化，使用高精度的时间序列测光。它是基于一个简单的斑点模型的见解，只有两个自由参数（其中一个可以从光变曲线估计），不需要恒星旋转周期的知识。我们在模拟数据上测试了该方法，并通过将其应用于MOST/SOPHIE对行星宿主星星HD 189733的观测来说明其性能，在那里它给出了与更复杂但高度退化的模型几乎相同的结果，以及太阳的合成数据，我们证明它可以再现远低于m s− 1水平的变化。我们还将其应用于开普勒凌日候选宿主星的1/4数据，在那里它可以用来估计RV变化下降到2-3 m s-1的水平，并表明RV振幅高于该水平可能是我们检查的候选星的约三分之二。
We present a new, simple method to predict activity-induced radial velocity (RV) variations using high-precision time series photometry. It is based on insights from a simple spot model, has only two free parameters (one of which can be estimated from the light curve) and does not require knowledge of the stellar rotation period. We test the method on simulated data and illustrate its performance by applying it toMOST/SOPHIE observations of the planet host star HD 189733, where it gives almost identical results to much more sophisticated but highly degenerate models, and synthetic data for the Sun, where we demonstrate that it can reproduce variations well below the m s−1level. We also apply it to quarter 1 data forKeplertransit candidate host stars, where it can be used to estimate RV variations down to the 2–3 m s−1level, and show that RV amplitudes above that level may be expected for approximately two-thirds of the candidates we examined.