A rubidium traced white-light etalon calibrator for MAROON-X

Julian Stürmer; Andreas Seifahrt; Christian Schwab; Jacob L. Bean

doi:10.1117/12.2232865

22 July 2016 A rubidium traced white-light etalon calibrator for MAROON-X

Julian Stürmer, Andreas Seifahrt, Christian Schwab, Jacob L. Bean

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 991229 (2016) https://doi.org/10.1117/12.2232865
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

We report on the construction and testing of a vacuum-gap Fabry-Perot etalon calibrator for high precision radial velocity spectrographs. The etalon is referenced against hyper fine transitions of rubidium to provide a precise wavelength calibrator for MAROON-X, a new fiber-fed, red-optical, high-precision radial-velocity spectrograph currently under construction for one of the twin 6.5m Magellan Telescopes in Chile. We demonstrate a turnkey system, ready to be installed at any current and next generation radial velocity spectrograph that requires calibration over a wide spectral band-pass. Uncertainties in the position of one etalon line are at the 10 cm s^-1 level in individual measurements taken at 4 Hz. Our long-term stability is mainly limited by aging effects of the spacer material Zerodur, which imprints a 12 cm s^-1 daily drift. However, as the etalon position is traced by the rubidium reference with a precision of <3 cm s^-1 for integration times longer than 10s, we can fully account for this effect at the RV data reduction level.

Citation Download Citation

Julian Stürmer, Andreas Seifahrt, Christian Schwab, and Jacob L. Bean "A rubidium traced white-light etalon calibrator for MAROON-X", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 991229 (22 July 2016); https://doi.org/10.1117/12.2232865

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