24 September 2012 Fiber scrambling for precise radial velocities at Lick and Keck Observatories
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Abstract
The detection of Earth analogs with radial velocity requires extreme Doppler precision and long term stability. Variations in the illumination of the slit and of the spectrograph optics occur on time scales of seconds and minutes, primarily because of guiding, seeing and focusing. These variations yield differences in the instrumental profile (IP). In order to stabilize the IP, we designed a fiber feed for the Hamilton spectrograph at Lick and for HIRES at Keck. Here, we report all results obtained with these fiber scramblers. We also present the design of a new double scrambler/pupil slicer for HIRES at Keck.
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J. F. P. Spronck, J. F. P. Spronck, D. A. Fischer, D. A. Fischer, Z. A. Kaplan, Z. A. Kaplan, C. Schwab, C. Schwab, } "Fiber scrambling for precise radial velocities at Lick and Keck Observatories", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84468Z (24 September 2012); doi: 10.1117/12.926289; https://doi.org/10.1117/12.926289
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