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Published October 2019 | Published
Journal Article Open

Impact of crosshatch patterns in H2RGs on high-precision radial velocity measurements: exploration of measurement and mitigation paths with the Habitable-Zone Planet Finder

Ninan, Joe P. ORCID icon
Mahadevan, Suvrath ORCID icon
Stefansson, Gudmundur ORCID icon
Bender, Chad ORCID icon
Roy, Arpita ORCID icon
Kaplan, Kyle F. ORCID icon
Fredrick, Connor ORCID icon
Metcalf, Andrew J. ORCID icon
Monson, Andrew ORCID icon
Terrien, Ryan ORCID icon
Ramsey, Lawrence W.
Diddams, Scott A. ORCID icon

Abstract

Teledyne's H2RG detector images suffer from crosshatch like patterns, which arise from subpixel quantum efficiency (QE) variation. We present our measurements of this subpixel QE variation in the Habitable-Zone Planet Finder's H2RG detector. We present a simple model to estimate the impact of subpixel QE variations on the radial velocity and how a first-order correction can be implemented to correct for the artifact in the spectrum. We also present how the HPF's future upgraded laser frequency comb will enable us to implement this correction.

Additional Information

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE). Paper 19038SS received Apr. 10, 2019; accepted for publication Oct. 8, 2019; published online Oct. 26, 2019. Authors thank organizers of ISPA-2018 for organizing a very informative and interactive workshop. This work was partially supported by the funding from the Center for Exoplanet and Habitable Worlds. The Center for Exoplanet and Habitable Worlds is supported by Pennsylvania State University, Eberly College of Science, and Pennsylvania Space Grant Consortium. We acknowledge support from NSF Grant Nos. AST1006676, AST1126413, AST1310885, and AST 1310875; and the NASA Astrobiology Institute (No. NNA09DA76A) in our pursuit of precision radial velocities in NIR, and support from the Heising-Simons Foundation. Computations for this research were performed on Pennsylvania State University's Institute for Cyber-Science Advanced CyberInfrastructure (ICS-ACI). We thank the HET staff for their critical assistance, expertise and support. Data presented herein were obtained at the Hobby-Eberly Telescope (HET), a joint project of the University of Texas at Austin, Pennsylvania State University, Ludwig-Maximilians-Universität München, and Georg-August Universität Gottingen. The HET is named in honor of its principal benefactors, William P. Hobby and Robert E. Eberly. The HET collaboration acknowledges the support and resources from the Texas Advanced Computing Center. Software: astropy,9 numpy,10 scipy,11 matplotlib,12 CoCalc,13 Sympy.14 Disclosures: The authors declare that there are no known conflicts of interest. The mention of specific companies and trade names is for scientific and technical purposes only and does not constitute an endorsement by NIST.

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Identifiers Funding Dates
Created:
August 22, 2023
Modified:
October 18, 2023