2018/10/11 by Fei, Zhao, Gang, Zhao, Yujuan, Liu +9
#Earth and Planetary Astrophysics (astro-ph.EP) #FOS: Physical sciences #Instrumentation and Methods for Astrophysics (astro-ph.IM)
paper · doi:10.48550/arxiv.1810.05529
The advent of the laser frequency comb as the wavelength calibration unit allows us to measure the radial velocity at cm s-1 precision level with high stability in long-term, which enable the possibility of the detection of Earth-twins around solar-like stars. 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 25GHz repetition frequency on a R∼50,000 spectrograph with the wavelength spanning from 5085Å to 7380Å. We report a novel fitting model optimized for the comb line profile, the constrained double Gaussian. The constraint condition is set as |μ1,2 - μ|