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arXiv 1901.00664astro-ph.IMastro-ph.EPastro-ph.SR
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TOU光学甚高分辨率光谱仪数据精简流水线及其亚m/s性能

Data Reduction Pipeline of the TOU Optical Very High Resolution Spectrograph and Its sub-m/s Performance

Bo Ma, Jian Ge

摘要:

TOU光谱仪是一台高分辨率的光谱仪(R= $100,000$,380-900 nm),主要用于低质量系外行星的径向速度探测,本文描述了TOU光谱仪基于IDL的径向速度(RV)数据处理流程,并分析了其在稳定恒星情况下的性能。该管道使用最小二乘拟合算法将观测到的恒星光谱与为每个恒星创建的高信噪比模板相匹配。通过仔细控制硬件和数据管道中对RV测量的所有误差贡献,我们已经实现了$\sim$ 0.9 \ms的长期RV精度,其中一颗RV最稳定的恒星,鲸鱼座τ星,类似于HARPS所实现的。本文介绍了如何达到\sms RV精度以及导致最终RV测量不确定度的所有主要误差源的数据管道中的步骤和细节。在这一管道开发中吸取的经验教训可以应用于其他环境控制的,非常高分辨率的光学光谱仪,以提高RV精度。

英文摘要:

TOU is an extremely high resolution optical spectrograph (R=$100,000$, 380-900~nm), which is designed to detect low mass exoplanets using the radial velocity technique.We describe an IDL-based radial velocity (RV) data reduction pipeline for the TOU spectrograph and its performance with stable stars. This pipeline uses a least-squares fitting algorithm to match observed stellar spectra to a high signal-to-noise template created for each star. By carefully controlling all of the error contributions to RV measurements in both the hardware and data pipeline, we have achieved $\sim$0.9\ms long-term RV precision with one of the most RV stable stars, Tau Ceti, similar to what has been achieved with HARPS. This paper presents steps and details in our data pipeline on how to reach the \sms RV precision and also all major error sources which contribute to the final RV measurement uncertainties. The lessons learned in this pipeline development can be applied to other environmentally controlled, very high resolution optical spectrographs to improve RV precision.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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