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Calibration Tests of a 25-GHz Mode-spacing Broadband Astro-comb on the Fiber-fed High Resolution Spectrograph (HRS) of the Chinese 2.16-m Telescope
Zhibo Hao1,2,3; Huiqi Ye1,2; Jian Han1,2; Yuanjie Wu1,2; Yang Zhai1,2; Dong Xiao1,2
2018-12
Source PublicationPublications of the Astronomical Society of the Pacific
Volume130Issue:994Pages:125001(1-12)
Abstract
A 25-GHz mode-spacing astro-comb with 470–720 nm wavelength coverage has been installed as the calibration source on the fiber-fed High Resolution Spectrograph (HRS) of the Chinese 2.16-m telescope at Xinglong Observatory. The calibration tests were carried out based on the single-channel system of HRS. The results have achieved a 2–8 times (for different orders) higher wavelength solution accuracy than the thorium argon (ThAr) lamp, and a short-term repeatability of 0.1m s−1, which is around the photon noise limit.

It proved that the coupling system linking the astro-comb to HRS successfully suppressed the negative effects of laser speckles. The comb-line overlapping exists in the acquired spectrum of the astro-comb on HRS.

We demonstrated that when determining the comb-line center, the comb-line overlapping leads to a systematic bias, which is caused by asymmetrical sampling, and meanwhile a larger uncertainty.

The correction for the systematic bias is feasible by simulating the overlapping comb lines according to actual comb-line spacing and pixel phase and then calculating the difference of the fitted line center with the true line center. A higher accuracy of wavelength solution has been achieved after correction.
KeywordAstro-comb Laser Frequency Comb Radial Velocities Data Analysis
Subject Area天文技术与方法
Language英语
WOS IDWOS:000456554400001
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/1533
Collection中国科学院南京天文光学技术研究所_期刊论文
中科院天文光学技术重点实验室_期刊论文
Affiliation1.南京天文光学技术研究所
2.天文光学技术重点实验室
3.中国科学院大学
Recommended Citation
GB/T 7714
Zhibo Hao,Huiqi Ye,Jian Han,et al. Calibration Tests of a 25-GHz Mode-spacing Broadband Astro-comb on the Fiber-fed High Resolution Spectrograph (HRS) of the Chinese 2.16-m Telescope[J]. Publications of the Astronomical Society of the Pacific,2018,130(994):125001(1-12).
APA Zhibo Hao,Huiqi Ye,Jian Han,Yuanjie Wu,Yang Zhai,&Dong Xiao.(2018).Calibration Tests of a 25-GHz Mode-spacing Broadband Astro-comb on the Fiber-fed High Resolution Spectrograph (HRS) of the Chinese 2.16-m Telescope.Publications of the Astronomical Society of the Pacific,130(994),125001(1-12).
MLA Zhibo Hao,et al."Calibration Tests of a 25-GHz Mode-spacing Broadband Astro-comb on the Fiber-fed High Resolution Spectrograph (HRS) of the Chinese 2.16-m Telescope".Publications of the Astronomical Society of the Pacific 130.994(2018):125001(1-12).
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