A passive cost-effective solution for the high accuracy wavelength calibration of radial velocity spectrographs

Françcis Wildi; Bruno Chazelas; Francesco Pepe

doi:10.1117/12.926841

24 September 2012 A passive cost-effective solution for the high accuracy wavelength calibration of radial velocity spectrographs

Françcis Wildi, Bruno Chazelas, Francesco Pepe

Author Affiliations +

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 84468E (2012) https://doi.org/10.1117/12.926841
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

Today, the RV technique has pushed the planet detection limits down to super-earths but the reach the precision required to detect earth-like planets it is necessary to reach a precision around 1cm s^-1. While a significant part of the error budget is the incompressible photon noise, another part is the noise in the wavelength calibration of the spectrograph. In the past 3 years the Observatory of Geneva has designed, built and tested an commissioned 2 wavelength calibrator systems based on a Fabry-Perot (FP) interferometer with great success. The calibrator system demonstrated 10 cm s^-1 stability over one night and 1 m s^-1 over 60 days. By improving the system injecting the calibration light into the calibration fiber of the spectrograph we are aiming at 1 m s^-1 repeatability over the long term. This technique is now being extended to cover the near infrared to the K band in the frame of the SPIROU project.

Citation Download Citation

Françcis Wildi, Bruno Chazelas, and Francesco Pepe "A passive cost-effective solution for the high accuracy wavelength calibration of radial velocity spectrographs", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84468E (24 September 2012); https://doi.org/10.1117/12.926841

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