Fiber scrambling for precise radial velocities at Lick and Keck Observatories

摘要

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 andminutes, primarily because of guiding, seeing and focusing. These variations yield differences in the instrumentalprofile (IP). In order to stabilize the IP, we designed a fiber feed for the Hamilton spectrograph at Lick and forHIRES at Keck. Here, we report all results obtained with these fiber scramblers. We also present the design ofa new double scrambler/pupil slicer for HIRES at Keck.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.