论文标题
与频率梳子的天文光谱仪校准的关键测试
A crucial test for astronomical spectrograph calibration with frequency combs
论文作者
论文摘要
激光频率梳（LFC）正是成为精确天文光谱的下一代校准源的途径。这种发展被认为是在太阳能星周周围寻找低质量岩石系外行星的关键，这些星星的发现，其径向速度方法的发现需要CM/S多普勒精度。为了证明使用LFC进行这种精确的校准，必须将其与至少具有相同精度的另一个校准器进行比较。作为最佳可用光谱仪校准器，这意味着将其与第二个完全独立的LFC进行比较。这项测试长期以来一直在待处理，但是我们在超稳定的光谱竖琴上安装了两个LFC为迄今为止使用两个独立的LFC同时进行校准提供了独特的机会。尽管时间有限，但测试结果证实了天文学群落长期以来一直期望的1 cm/s稳定性。
Laser frequency combs (LFCs) are well on their way to becoming the next-generation calibration sources for precision astronomical spectroscopy. This development is considered key in the hunt for low-mass rocky exoplanets around solar-type stars whose discovery with the radial-velocity method requires cm/s Doppler precision. In order to prove such precise calibration with an LFC, it must be compared to another calibrator of at least the same precision. Being the best available spectrograph calibrator, this means comparing it to a second - fully independent - LFC. This test had long been pending, but our installation of two LFCs at the ultra-stable spectrograph HARPS presented the so far unique opportunity for simultaneous calibrations with two separate LFCs. Although limited in time, the test results confirm the 1 cm/s stability that has long been anticipated by the astronomical community.
