Line profile analysis of the laser frequency comb in FOCES

Liang Wang; Frank Grupp; Hanna Kellermann; Ulrich Hopp; Ralf Bender

doi:10.1117/12.2273706

12 September 2017 Line profile analysis of the laser frequency comb in FOCES

Liang Wang, Frank Grupp, Hanna Kellermann, Ulrich Hopp, Ralf Bender

Proceedings Volume 10400, Techniques and Instrumentation for Detection of Exoplanets VIII; 104001V (2017) https://doi.org/10.1117/12.2273706
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Abstract

FOCES is a fiber-fed, stabilized high-resolution (R ∼ 70,000) spectrograph attached to the 2m Fraunhofer Telescope in Wendelstein Observatory. An optical, broad-band laser frequency comb with the repetition rate of 25 GHz is used as the wavelength calibration source to obtain the precise radial velocities. We describe our method of modelling the instrumental profiles. A Gaussian plus an empirical spline function are used to fit the line spread function (LSF). We also present the results of obtaining radial velocities from an overlap of stellar spectra and emission lines of the laser frequency comb.

Citation Download Citation

Liang Wang, Frank Grupp, Hanna Kellermann, Ulrich Hopp, and Ralf Bender "Line profile analysis of the laser frequency comb in FOCES", Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104001V (12 September 2017); https://doi.org/10.1117/12.2273706

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