Keck Planet Finder: preliminary design

Creators: Gibson, Steven R.; Howard, Andrew W.; Roy, Arpita; Smith, Roger

Others:: Evans, Christopher J.; Simard, Luc; Takami, Hideki

Abstract

The Keck Planet Finder (KPF) is a fiber-fed, high-resolution, high-stability spectrometer in development for the W.M. Keck Observatory. The instrument recently passed its preliminary design review and is currently in the detailed design phase. KPF is designed to characterize exoplanets using Doppler spectroscopy with a single measurement precision of 0.5 m s^(−1) or better; however, its resolution and stability will enable a wide variety of other astrophysical pursuits. KPF will have a 200 mm collimated beam diameter and a resolving power greater than 80,000. The design includes a green channel (445 nm to 600 nm) and red channel (600 nm to 870 nm). A novel design aspect of KPF is the use of a Zerodur optical bench, and Zerodur optics with integral mounts, to provide stability against thermal expansion and contraction effects.

Additional Information

© 2018 Society of Photo-optical Instrumentation Engineers (SPIE). The authors thank the Heising-Simons Foundation, the W.M. Keck Foundation, the University of California, Berkeley, the California Institute of Technology, and the University of Hawaii for financial support of KPF. The authors also wish to thank Winlight Systems for their valuable contributions to the designs of the reformatter and cameras, as well as the DESI project for sharing their camera designs and their expertise with optical fibers. This work was performed by SPH under contract with the Jet Propulsion Laboratory (JPL) funded by NASA through the Sagan Fellowship Program executed by the NASA Exoplanet Science Institute.

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