The Keck Planet Finder (KPF) is a fiber-fed, high-resolution, echelle spectrometer that specializes in the discovery and characterization of exoplanets using Doppler spectroscopy. In designing KPF, the guiding principles were high throughput to promote survey speed and access to faint targets, and high stability to keep uncalibrated systematic Doppler measurement errors below 30 cm s−1. KPF achieves optical illumination stability with a tip-tilt injection system, octagonal cross-section optical fibers, a double scrambler, and active fiber agitation. The optical bench and optics with integral mounts are made of Zerodur to provide thermo-mechanical stability. The spectrometer includes a slicer to reformat the optical input, green and red channels (445–600 nm and 600–870 nm), and achieves a resolving power of ∼97,000. Additional subsystems include a separate, medium-resolution UV spectrometer (383–402 nm) to record the Ca II H & K lines, an exposure meter for real-time flux monitoring, a solar feed for sunlight injection, and a calibration system with a laser frequency comb and etalon for wavelength calibration. KPF was installed and commissioned at the W. M. Keck Observatory in late 2022 and early 2023 and is now in regular use for scientific observations. This paper presents an overview of the as-built KPF instrument and its subsystems, design considerations, and initial on-sky performance.
For 25 years, W. M. Keck Observatory has relied on observers to do their own planning for their observing nights. This would usually result in a starlist and a notion of what would be best to observe next based on the priority to the science they were conducting. Under the Data Services Initiative, this will become a required part of observing. The Database-Driven Observing Infrastructure aims to supplement the creation of science-ready data by carrying observation metadata throughout the observing process. The result is a file with all the data about the observation ready to be processed by the pipelines. In order to facilitate this, tools are being developed to help create better observing plans. One of the big complexities is that W. M. Keck Observatory currently supports ten active instruments with more on the horizon and no clear plan of retiring old instruments. With that in mind, the Database-Driven Observing Infrastructure system has been developed to be modular and instrument agnostic so that differences are abstracted from the system and handled only at the entrance and exit points of an observation. The benefit to this is that new instruments are easy to implement and old instruments are easy to update.
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