使用CRIRES测量径向速度：将精度降低至5-10 m/s
Radial Velocities with CRIRES: Pushing precision down to 5-10 m/s
摘要：
随着高分辨率红外光谱仪的出现，径向速度（RV）搜索进入了一个新的领域。到目前为止，需要解决的最重要的技术问题是哪种波长基准最适合高精度RV测量。在这项工作中，我们将探讨使用大气吸收功能。我们利用CRIRES数据的两个程序和三个不同的目标。我们重新分析TW Hya活动的数据，在大约1周的时间尺度内达到RV标准的约6 m/s的分散度。我们确认TW Hya本身存在低振幅RV信号，大约比可见光波长下报告的信号小3倍。我们还介绍了G186的RV测量，表明我们的方法能够检测到行星引起的信号并正确地量化它。我们的数据表明，CRIRES能够在一周的时间尺度内达到小于10 m/s的RV精度。这种特殊的方法的局限性进行了讨论，RV精度的限制因素在IR中的一般方式。这项工作对未来专用红外光谱仪设计的影响也得到了解决。
英文摘要：
With the advent of high-resolution infrared spectrographs, Radial Velocity (RV) searches enter into a new domain. As of today, the most important technical question to address is which wavelength reference is the most suitable for high-precision RV measurements. In this work we explore the usage of atmospheric absorption features. We make use of CRIRES data on two programs and three different targets. We re-analyze the data of the TW Hya campaign, reaching a dispersion of about 6 m/s on the RV standard in a time scale of roughly 1 week. We confirm the presence of a low-amplitude RV signal on TW Hya itself, roughly 3 times smaller than the one reported at visible wavelengths. We present RV measurements of Gl 86 as well, showing that our approach is capable of detecting the signal induced by a planet and correctly quantifying it. Our data show that CRIRES is capable of reaching a RV precision of less than 10 m/s in a time-scale of one week. The limitations of this particular approach are discussed, and the limiting factors on RV precision in the IR in a general way. The implications of this work on the design of future dedicated IR spectrographs are addressed as well.
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