Calibration unit design for Keck/High-Resolution Infrared Spectrograph for Exoplanet Characterization (HISPEC)

Ben Sappey; Quinn Konopacky; Jerome Maire; Ashley Baker; Nemanja Jovanovic; Samuel Halverson; Rose Gibson; Stephanie Leifer; Jocelyn Ferrara; Rob Bertz; Dimitri Mawet; Michael Fitzgerald; Marc Kassis; John I. Bailey III; Jason Fucik; Don Neill; Chris Johnson; Ken Magnone

doi:10.1117/12.3020409

18 July 2024 Calibration unit design for Keck/High-Resolution Infrared Spectrograph for Exoplanet Characterization (HISPEC)

Ben Sappey, Quinn Konopacky, Jerome Maire, Ashley Baker, Nemanja Jovanovic, Samuel Halverson, Rose Gibson, Stephanie Leifer, Jocelyn Ferrara, Rob Bertz, Dimitri Mawet, Michael Fitzgerald, Marc Kassis, John I. Bailey III, Jason Fucik, Don Neill, Chris Johnson, Ken Magnone

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130966K (2024) https://doi.org/10.1117/12.3020409
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The latest generation of high-resolution spectrographs on 10m-class telescopes are designed to pursue challenging science cases. Consequently, ever more precise calibration methods are necessary to enable trail-blazing science methodology. We present the High-Resolution Infrared SPectrograph for Exoplanet Characterization (HISPEC) Calibration Unit (CAL), designed to facilitate challenging science cases such as Doppler imaging of exoplanet atmospheres, precision radial velocity, and high-contrast, high-resolution spectroscopy of nearby exoplanets. CAL builds on the heritage of the pathfinder instrument, the Keck Planet Imager and Characterizer (KPIC) and utilizes four near-infrared (NIR) light sources encoded with wavelength information that are coupled into single-mode fibers. They can be used synchronously during science observations or asynchronously during daytime calibrations. A uranium hollow cathode lamp (HCL) and a series of gas cells provide absolute calibration from 0.98 μm to 2.46 μm. Two laser frequency combs (LFC) provide stable, time-independent wavelength information during observation, and CAL implements two low-finesse Fabry-Perot etalons as a complement to the LFCs.

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Ben Sappey, Quinn Konopacky, Jerome Maire, Ashley Baker, Nemanja Jovanovic, Samuel Halverson, Rose Gibson, Stephanie Leifer, Jocelyn Ferrara, Rob Bertz, Dimitri Mawet, Michael Fitzgerald, Marc Kassis, John I. Bailey III, Jason Fucik, Don Neill, Chris Johnson, and Ken Magnone "Calibration unit design for Keck/High-Resolution Infrared Spectrograph for Exoplanet Characterization (HISPEC)", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130966K (18 July 2024); https://doi.org/10.1117/12.3020409

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