Time-variable differences between H2RG readout channels in high precision spectroscopy: a case study with the Habitable-zone Planet Finder

Ryan C. Terrien; Joe Ninan; Chad Bender; Suvrath Mahadevan; Scott Diddams; Connor Fredrick; Samuel Halverson; Andrew J. Metcalf; Andrew Monson; Arpita Roy; Guðmundur Stefánsson; Lawrence Ramsey

doi:10.1117/12.2576318

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

Ryan C. Terrien, Joe Ninan, Chad Bender, Suvrath Mahadevan, Scott Diddams, Connor Fredrick, Samuel Halverson, Andrew J. Metcalf, Andrew Monson, Arpita Roy, Guðmundur Stefánsson, Lawrence Ramsey

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Proceedings Volume 11454, X-Ray, Optical, and Infrared Detectors for Astronomy IX; 114541T (2020) https://doi.org/10.1117/12.2576318
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

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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Ryan C. Terrien, Joe Ninan, Chad Bender, Suvrath Mahadevan, Scott Diddams, Connor Fredrick, Samuel Halverson, Andrew J. Metcalf, Andrew Monson, Arpita Roy, Guðmundur Stefánsson, and Lawrence Ramsey "Time-variable differences between H2RG readout channels in high precision spectroscopy: a case study with the Habitable-zone Planet Finder", Proc. SPIE 11454, X-Ray, Optical, and Infrared Detectors for Astronomy IX, 114541T (13 December 2020); https://doi.org/10.1117/12.2576318

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KEYWORDS

Planets

Spectroscopy

CMOS sensors

Doppler effect

Spectrographs

Charge-coupled devices

Exoplanets

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