论文标题
逐线速度测量值，一种用于精确速度法的异常值
Line-by-line velocity measurements, an outlier-resistant method for precision velocimetry
论文作者
论文摘要
我们提出了一种用于精确径向速度（PRV）测量值的新算法，这是一种逐线（LBL）方法，旨在以简单但有效的方式处理外围光谱信息。在两个数据集上证明了LBL方法的有效性，一个在Barnard的恒星上获得了一个，另一个在Proxima Centauri上带有竖琴。在近红外，LBL为PRV测量的M/S级准确性提供了一个框架，尽管与矫尿吸收和天空排放线相关的挑战。我们通过跨越2。7年的Spiou测量结果确认，由于时间采样和活动的结合，Barnard恒星周围233天轨道上的候选超级地球是人工制品。单独升级数据的Proxima Centauri Harps的LBL分析很容易恢复ProXIMA B信号，还提供了对最近确认的5天Proxima d Planet的2-sigma检测，但反对在1900天的时间内与候选人的存在。我们提供的证据表明，PROXIMA C信号与影响HARPS-TERRA模板匹配的长周期信号的RV提取方法的小，未划分的系统效应有关。最后，LBL框架提供了一个非常有效的活动指示器，类似于从互相关函数得出的一半的全宽度，从中我们推断出$ 92.1^{+4.2} _ { - 3.5} $ days $ 92.1^{+4.2} $ days $ proxima。
We present a new algorithm for precision radial velocity (pRV) measurements, a line-by-line (LBL) approach designed to handle outlying spectral information in a simple but efficient manner. The effectiveness of the LBL method is demonstrated on two datasets, one obtained with SPIRou on Barnard's star, and the other with HARPS on Proxima Centauri. In the near-infrared, the LBL provides a framework for m/s-level accuracy in pRV measurements despite the challenges associated with telluric absorption and sky emission lines. We confirm with SPIRou measurements spanning 2.7 years that the candidate super-Earth on a 233-day orbit around Barnard's star is an artifact due to a combination of time-sampling and activity. The LBL analysis of the Proxima Centauri HARPS post-upgrade data alone easily recovers the Proxima b signal and also provides a 2-sigma detection of the recently confirmed 5-day Proxima d planet, but argues against the presence of the candidate Proxima c with a period of 1900 days. We provide evidence that the Proxima c signal is associated with small, unaccounted systematic effects affecting the HARPS-TERRA template matching RV extraction method for long-period signals. Finally, the LBL framework provides a very effective activity indicator, akin to the full width at half maximum derived from the cross-correlation function, from which we infer a rotation period of $92.1^{+4.2}_{-3.5}$ days for Proxima.
