Line-profile variations in radial-velocity measurements (Corrigendum) - Two alternative indicators for planetary searches
Line-profile variations in radial-velocity measurements (Corrigendum) - Two alternative indicators for planetary searches
复制标题
径向速度测量中的线剖面变化（勘误表）-行星搜索的两个替代指标
DOI：
10.1051/0004-6361/201220779e
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发表时间：
2015
影响因子：
6.5
通讯作者：
N. Nardetto
中科院分区：
文献类型：
--
作者：
P. Figueira;N. Santos;F. Pepe;C. Lovis;N. Nardetto
1. Figueira等.（2013）我们提出了一个新的线轮廓变化指标，V asy。对于给定的谱线，该指标评估径向速度（RV）信息内容的不对称性。通过评估这种不对称性并将该量与RV变化相关联，可以识别该变化是源于线轮廓的变形还是源于真正的RV偏移。在Figueira et al.（2013）我们定义了（1）其中W i是在通量水平i处计算的点的权重，如等式中定义的。(8)关于Bouchy et al.（2001），其中（2）λ（i）和A0（i）分别表示光谱的波长和通量，以及检测器读出噪声。由于我们是在速度空间中工作，波长是一个速度。这是标准过程，并且已广泛应用于互相关函数（CCF）。此外，我们正在一个非常高的信号噪声域工作。然后，我们可以以（3）的形式重写前面的等式，其中RV（i）是CCF的每个像素（即x轴）的RV值。对于每个通量水平i，我们考虑三个量：蓝翼信息Wi（蓝色）;红翼信息Wi（红色）;以及两者之间的平均值，作为未变形线在该通量水平处的信息内容的权重的代表。
1. BackgroundIn Figueira et al.(2013) we proposed a new line profile variation indicator, V asy. For a given spectral line, this indicator evaluates the asymmetry in the radial velocity (RV) information content. By evaluating this asymmetry and associating the quantity to an RV variation, it is possible to identify whether the variation stems from a deformation of the line profile or from a bona fide RV shift. In Figueira et al.(2013) we defined that (1) in which W i are the weights of the point calculated at the flux level i, as defined in Eq.(8) of Bouchy et al.(2001), where (2) with λ (i) and A 0 (i) representing the wavelength and flux of the spectra, respectively, and the detector readout noise. Since we are working in the velocity space, the wavelength is a velocity. This is standard procedure and has been applied extensively to the cross-correlation function (CCF). Moreover, we are working in a very high signal-to-noise domain as such,. We can then rewrite the previous equation in the form of (3) in which RV (i) is the RV value of each pixel (ie x-axis) of the CCF. For every flux level i, we consider three quantities: the blue wing information, W i (blue); the red wing information, W i (red); and the average between the two,, as representative of the weight of the information content at this flux level for an undeformed line.