The Dark Energy Survey Supernova Program: Corrections on Photometry Due to Wavelength-dependent Atmospheric Effects

Lee, J. and Acevedo, M. and Sako, M. and Vincenzi, M. and Brout, D. and Sanchez, B. and Chen, R. and Davis, T. M. and Jarvis, M. and Scolnic, D. and Qu, H. and Galbany, L. and Kessler, R. and Lasker, J. and Sullivan, M. and Wiseman, P. and Aguena, M. and Allam, S. and Alves, O. and Andrade-Oliveira, F. and Bertin, E. and Bocquet, S. and Brooks, D. and Burke, D. L. and Carnero Rosell, A. and Carrasco Kind, M. and Carretero, J. and Costanzi, M. and da Costa, L. N. and Pereira, M. E. S. and De Vicente, J. and Desai, S. and Diehl, H. T. and Doel, P. and Everett, S. and Ferrero, I. and Friedel, D. and Frieman, J. and García-Bellido, J. and Gerdes, D. W. and Gruen, D. and Gruendl, R. A. and Gutierrez, G. and Hinton, S. R. and Hollowood, D. L. and Honscheid, K. and James, D. J. and Kent, S. and Kuehn, K. and Kuropatkin, N. and Mena-Fernández, J. and Miquel, R. and Ogando, R. L. C. and Palmese, A. and Pieres, A. and Malagón, A. A. Plazas and Raveri, M. and Reil, K. and Rodriguez-Monroy, M. and Sanchez, E. and Scarpine, V. and Sevilla-Noarbe, I. and Smith, M. and Suchyta, E. and Tarle, G. and To, C. and Weaverdyck, N. (2023) The Dark Energy Survey Supernova Program: Corrections on Photometry Due to Wavelength-dependent Atmospheric Effects. The Astronomical Journal, 165 (6). p. 222. ISSN 0004-6256

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Official URL: https://doi.org/10.3847/1538-3881%2Facca15

Abstract

Wavelength-dependent atmospheric effects impact photometric supernova flux measurements for ground-based observations. We present corrections on supernova flux measurements from the Dark Energy Survey Supernova Program's 5YR sample (DES-SN5YR) for differential chromatic refraction (DCR) and wavelength-dependent seeing, and we show their impact on the cosmological parameters w and Ωm. We use g − i colors of Type Ia supernovae to quantify astrometric offsets caused by DCR and simulate point-spread functions (PSFs) using the GalSIM package to predict the shapes of the PSFs with DCR and wavelength-dependent seeing. We calculate the magnitude corrections and apply them to the magnitudes computed by the DES-SN5YR photometric pipeline. We find that for the DES-SN5YR analysis, not accounting for the astrometric offsets and changes in the PSF shape cause an average bias of +0.2 mmag and −0.3 mmag, respectively, with standard deviations of 0.7 mmag and 2.7 mmag across all DES observing bands (griz) throughout all redshifts. When the DCR and seeing effects are not accounted for, we find that w and Ωm are lower by less than 0.004 ± 0.02 and 0.001 ± 0.01, respectively, with 0.02 and 0.01 being the 1σ statistical uncertainties. Although we find that these biases do not limit the constraints of the DES-SN5YR sample, future surveys with much higher statistics, lower systematics, and especially those that observe in the u band will require these corrections as wavelength-dependent atmospheric effects are larger at shorter wavelengths. We also discuss limitations of our method and how they can be better accounted for in future surveys.

Item Type:	Article
Subjects:	Euro Archives > Physics and Astronomy
Depositing User:	Managing Editor
Date Deposited:	14 Nov 2023 03:48
Last Modified:	14 Nov 2023 03:48
URI:	http://publish7promo.com/id/eprint/3951

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