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Published December 13, 2020 | Version public
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Time-variable differences between H2RG readout channels in high precision spectroscopy: a case study with the Habitable-zone Planet Finder

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Abstract

High precision Doppler spectroscopy hinges on an accurate understanding of the wavelength-to-pixel mapping (wavelength solution) of the spectrograph, including particularly systematics related to the detector. Herein, we describe the uniformity and stability of the wavelength solution of the Habitable-zone Planet Finder (HPF), a near-infrared spectrograph that utilizes a Hawaii-2RG (H2RG) hybrid CMOS detector. We focus on time-varying discontinuities equivalent to approximately 10 m/s in the otherwise-smooth wavelength solution, corresponding to the boundaries between H2RG readout channels. This behavior is revealed by calibration with dedicated laser frequency comb and white light-illuminated Fabry-Perot systems over a ~1 year baseline. These findings will inform the usage of similar near-infrared CMOS devices for high-precision applications including Doppler exoplanet and gravitational lensing WFIRST surveys.

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© 2020 SPIE.

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Eprint ID
107140
Resolver ID
CaltechAUTHORS:20201216-152240732

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Created
2020-12-17
Created from EPrint's datestamp field
Updated
2021-11-16
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Series Name
Proceedings of SPIE
Series Volume or Issue Number
11454