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Statistical modelling of an astro-comb for high-precision radial velocity observation

文献类型：期刊论文

作者Zhao, Fei2; Zhao, Gang2; Liu, Yujuan2; Wang, Liang4,5; Wang, Huijuan2; Li, Hongbin2; Ye, Huiqi1,3; Hao, Zhibo1,3; Xiao, Dong1,3; Zhang, Junbo2
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2019
卷号482期号:1页码:1406-1416
ISSN号0035-8711
关键词methods: data analysis techniques: radial velocities techniques: spectroscopic
DOI10.1093/mnras/sty2754
英文摘要The advent of the laser-frequency comb as the wavelength calibration unit allows us to measure the radial velocity (RV) at cm s(-1) precision level with high stability in the long term, which enables the possibility of the detection of Earth twins around solar-like stars. A recent study shows that the laser-frequency comb can also be used to measure and study the precision of the instrumental system including the variations of line profile and the systematic uncertainty and instrumental drift. In this paper, we present the stringent analysis of a laser-frequency comb (LFC) system with 25 GHz repetition frequency on an R 50 000 spectrograph with the wavelength spanning from 5085-7380 We report a novel fitting model optimized for the comb line profile, the constrained double Gaussian. The constraint condition is set as We introduce a Bayesian information criterion to test various models. Compared to the traditional Gaussian model, the CDG (constrained double Gaussian) model provides a much better goodness of fit. We apply the CDG model to the observed comb data to demonstrate the improvement of the RV precision with the CDG model. We find that the improvement of the CDG model is about 40-60 per cent for wavelength calibration precision. We also consider the use of the LFC and CDG model as a tool to characterize the line-shape variation across the detector. The aim of this work is to measure and understand the details of the comb lines including their asymmetry and behaviours under various conditions, which play a significant role in the simultaneous calibration process and cross-correlation function method to determine the Doppler shift at high precision level.
WOS关键词LASER FREQUENCY COMB ; SPECTROGRAPH ; CALIBRATION ; COMPANION ; SEARCH
资助项目National Science Foundation of China (NSFC)[11703052] ; National Science Foundation of China (NSFC)[11390371] ; National Science Foundation of China (NSFC)[11303042]
WOS研究方向Astronomy & Astrophysics
语种英语
出版者OXFORD UNIV PRESS
WOS记录号WOS:000454575300098
资助机构National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC)
源URL[http://ir.bao.ac.cn/handle/114a11/24309]  
专题中国科学院国家天文台
通讯作者Zhao, Fei
作者单位1.Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Natl Astron Observ, Nanjing 210042, Jiangsu, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Datun Rd 20A, Beijing 100012, Peoples R China
3.Chinese Acad Sci, Key Lab Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R China
4.Max Planck Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany
5.Univ Sternwarte Munchen, Scheinerstr 1, D-81679 Munich, Germany
推荐引用方式
GB/T 7714		 Zhao, Fei,Zhao, Gang,Liu, Yujuan,et al. Statistical modelling of an astro-comb for high-precision radial velocity observation[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,482(1):1406-1416.
APA Zhao, Fei.,Zhao, Gang.,Liu, Yujuan.,Wang, Liang.,Wang, Huijuan.,...&Grupp, Frank.(2019).Statistical modelling of an astro-comb for high-precision radial velocity observation.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,482(1),1406-1416.
MLA Zhao, Fei,et al."Statistical modelling of an astro-comb for high-precision radial velocity observation".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 482.1(2019):1406-1416.

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来源：国家天文台

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