用于视向速度测量的法珀标准具性能测试(特邀)  

Performance Test of Fabery-Perot Etalon for Radial Velocity Measurement(Invited)

作　　者：陆彦婷 叶慧琪[1,2] 唐靓[1,2] 翟洋[1,2] 张凯[1,2] 肖东[1,2] LU Yanting;YE Huiqi;TANG Liang;ZHAI Yang;ZHANG Kai;XIAO dong(Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China;CAS Key Laboratory of Astronomical Optics&Technology,Nanjing Institute of Astronomical Optics&Technology,Nanjing 210042,China)

机构地区：[1]中国科学院南京天文光学技术研究所,南京210042 [2]中国科学院天文光学技术重点实验室(南京天文光学技术研究所),南京210042

出　　处：《光子学报》2024年第10期85-94,共10页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.12273082,12373094,12293054,11903060);中国科学院科研仪器设备研制项目(No.ZDKYYQ20220009);中国科学院青年创新促进会(No.2023068)。

摘　　要：通过国家天文台兴隆观测基地2.16 m望远镜高色散光纤光谱仪,对一套置于真空恒温系统中的标准具进行测试分析。实测定标谱线频率间距~29.87 GHz,波长覆盖500~685 nm,波长范围内共有5425条谱线,谱线自身宽度小于光谱仪最小分辨单元。与激光频率梳同步对比测试表明,稳定后法布里-珀罗标准具谱线超过5 h的稳定性好于0.61 m/s,可以满足天文观测一个观测夜的稳定性需求。使用这些谱线对此光谱仪重新进行波长定标,并将激光频率梳作为已知的波长标准对定标结果进行检验,法布里-珀罗标准具波长解的残差标准差约为钍氩灯波长解的一半,说明其定标精度更高。Radial velocity measurement based on high resolution spectrum of stellar is crucial to exoplanet detection.To meet the requirement of detection of small rocky type exoplanet which is similar to earth,the astronomic high resolution spectrographs need advanced wavelength calibration technology to remove the errors of instrument to reach the precision of 1 m/s or better.The white light-illuminated Fabery-Perot Etalon(FPE)is a new type of wavelength calibrator,which can supply the precision of wavelength reference at 0.1 m/s/day theoretically.Recent years,wavelength calibration for astronomic high resolution spectrograph using Fabery-Perot etalon attracts great attentions due to its high precision,flexible parameters customization for different spectrographs,ease of use and low cost.We developed one calibrator based on an air-spaced Fabery-Perot etalon inside a temperature well controlled vacuum vessel.The free spectral range,fineness and working wavelength of etalon is 30 GHz,37 and 500~700 nm,respectively.The fineness of the calibrator reduces to about 11 due to the effects of the near-field distribution of its feeding fiber.The material of spacer is ULE 7973.A 500 nm long pass filter and a 700 nm short pass filter were used to filter out the light from a halogen tungsten lamp,the emission of which is similar to that of 2800 K blackbody.The temperature variation coefficient close to etalon inside the Vacuum vessel is about 12 mK/℃.To test the performance of this calibrator,we feed it into the calibration system of the fiber-fed High Resolution Spectrograph(HRS)at Xinglong 2.16 meters telescope.This spectrograph is the main stellar radial velocity facility of China.The resolution is about 50000 with the working wavelength range from 360~900 nm.The temperature and air pressure of the environment of the spectrograph are well controlled.After the upgradation in the year of 2021,the spectrograph now has 2 feed fibers,one for observation,another for simultaneous reference.Accordingly,the calibration system of spectrogr

关 键 词：视向速度 多谱勒频移 天文光谱仪 波长定标 标准具 

分 类 号：P111[天文地球—天文学]