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Proceedings Paper

The optical delay measurement for Lijiang Exoplanet Tracker
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Paper Abstract

Lijiang Exoplanet Tracker (LijET) was designed to detect exoplanets with extremely high precision radial velocity (RV) measurements, and it was mounted on 2.4m telescope at Lijiang Observatory in 2011. The Dispersed Fixed- Delay Interferometry (DFDI) mode of LiJET is a combination of a thermally compensated monolithic michelson interferometer and a cross-dispersed echelle spectrograph. When the slit width is 1.6”, the spectral resolution is 18000. With a 4k x 4k CCD, the spectrograph has wavelength coverage of 390nm-690nm. The temperature stability of the instrument is 25±0.001°C, and the pressure stability of the instrument is 10.9±0.001psi. LiJET realize high precision RV measurements by measuring the phase shifts of fringes in the slit direction. Differential RV is a function of light speed, phase shift, wavelength and optical delay. Thus, optical delay is necessary to be determined accurately to take differential RV measurements to derive precise RV. We used thorium argon (ThAr) and tungsten lamp to calibration the DFDI spectrum of LiJET, and then to calculate the optical delay at different channels on the CCD detector.

Paper Details

Date Published: 20 December 2019
PDF: 6 pages
Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 112092K (20 December 2019); doi: 10.1117/12.2548400
Show Author Affiliations
Xiaoli Wang, Yunnan Observatories, CAS (China)
Key Lab. for the Structure and Evolution of Celestial Objects (China)
Kaifan Ji, Yunnan Observatories, CAS (China)
Key Lab. for the Structure and Evolution of Celestial Objects (China)
Peng Jiang, Polar Research Institute of China (China)
Jian Ge, Univ. of Florida (United States)
Liang Xu, Yunnan Observatories, CAS (China)
Key Lab. for the Structure and Evolution of Celestial Objects (China)
Xiaoguang Yu, Yunnan Observatories, CAS (China)
Key Lab. for the Structure and Evolution of Celestial Objects (China)
Liang Chang, Yunnan Observatories, CAS (China)
Key Lab. for the Structure and Evolution of Celestial Objects (China)
Chuanjun Wang, Yunnan Observatories, CAS (China)
Key Lab. for the Structure and Evolution of Celestial Objects (China)
Baoli Lun, Yunnan Observatories, CAS (China)
Key Lab. for the Structure and Evolution of Celestial Objects (China)
Jianguo Wang, Yunnan Observatories, CAS (China)
Key Lab. for the Structure and Evolution of Celestial Objects (China)
Jilin Zhou, Nanjing Univ. (China)
Hongyan Zhou, Polar Research Institute of China (China)
Tinggui Wang, Univ. of Science and Technology of China (China)


Published in SPIE Proceedings Vol. 11209:
Eleventh International Conference on Information Optics and Photonics (CIOP 2019)
Hannan Wang, Editor(s)

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