Fringing Analysis and Simulation for the Vera C. Rubin Observatory’s Legacy Survey of Space and Time

Guo, Zhiyuan; Walter, C. W.; Lage, Craig; Lupton, Robert H.

doi:10.1088/1538-3873/acbe67

Fringing Analysis and Simulation for the Vera C. Rubin Observatory’s Legacy Survey of Space and Time

Journal Article · 28 February 2023 · Publications of the Astronomical Society of the Pacific

DOI:https://doi.org/10.1088/1538-3873/acbe67· OSTI ID:2419943

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OSTI

Abstract

The presence of fringing in astronomical Charge-Coupled Device (CCD) images will have an impact on photometric quality and measurements. Yet its impact on the Vera C. Rubin Observatory’s Legacy Survey of Space and Time (LSST) has not been fully studied. We present a detailed study on fringing for CCDs already implemented on the Rubin Observatory LSST Camera’s focal plane. After making physical measurements and knowing the compositions, we developed a model for the e2v CCDs. We present a method to fit for the internal height variation of the epoxy layer within the sensors based on fringing measurements in a laboratory setting. This method is generic enough that it can be easily modified to work for other CCDs. Using the derived fringing model, we successfully reproduce comparable fringing amplitudes that match the observed levels in images taken by existing telescopes with different optical designs. This model is then used to forecast the expected level of fringing in a single LSSTy-band sky background exposure with Rubin telescope optics in the presence of a realistic time-varying sky spectrum. The predicted fringing amplitude in LSST images ranges from 0.04% to 0.2% depending on the location of a CCD on the focal plane. We find that the predicted variation in surface brightness caused by fringing in LSSTy-band sky background images is about 0.6 $μ Jy {arcsec}^{- 2}$ , which is 40 times larger than the current measurement error. We conclude that it is necessary to include fringing correction in the Rubin’s LSST image processing pipeline.

Research Organization:: Univ. of California, Davis, CA (United States); Duke Univ., Durham, NC (United States); Univ. of California, Oakland, CA (United States); Stanford Univ., CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0009999; SC0010007; AC02-05CH11231; AC02-76SF00515

OSTI ID:: 2419943

Journal Information:: Publications of the Astronomical Society of the Pacific, Journal Name: Publications of the Astronomical Society of the Pacific Journal Issue: 1045 Vol. 135; ISSN 0004-6280

Publisher:: Astronomical Society of the Pacific (ASP)

Country of Publication:: United States

Language:: English

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