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The Dark Energy Survey supernova program: corrections on photometry due to wavelength-dependent atmospheric effects

The Dark Energy Survey supernova program: corrections on photometry due to wavelength-dependent atmospheric effects
The Dark Energy Survey supernova program: corrections on photometry due to wavelength-dependent atmospheric effects

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.

0004-6256
Lee, J.
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Acevedo, M.
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Sako, M.
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Vincenzi, M.
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Chen, R.
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Davis, T.M.
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Jarvis, M.
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Kessler, R.
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Lasker, J.
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Sullivan, M.
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To, C.
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Weaverdyck, N
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The Dark Energy Survey Collaboration
Lee, J.
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Acevedo, M.
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Sako, M.
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Vincenzi, M.
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Jarvis, M.
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Scolnic, D.
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Kessler, R.
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Lasker, J.
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Sullivan, M.
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Wiseman, P.
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Costanzi, M.
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da Costa, L.N.
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Lee, J., Acevedo, M. and Sako, M. , The Dark Energy Survey Collaboration (2023) The Dark Energy Survey supernova program: corrections on photometry due to wavelength-dependent atmospheric effects. Astronomical Journal, 165 (6), [222]. (doi:10.3847/1538-3881/acca15).

Record type: Article

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.

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Accepted/In Press date: 2 April 2023
e-pub ahead of print date: 3 May 2023
Additional Information: Funding Information: The DES data management system is supported by the National Science Foundation under grant No. AST-1138766 and AST-1536171. The DES participants from Spanish institutions are partially supported by MICINN under grants ESP2017-89838, PGC2018-094773, PGC2018-102021, SEV-2016-0588, SEV-2016-0597, and MDM-2015-0509, some of which include ERDF funds from the European Union. IFAE is partially funded by the CERCA program of the Generalitat de Catalunya. Research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Program (FP7/2007-2013) including ERC grant agreements 240672, 291329, and 306478. We acknowledge support from the Brazilian Instituto Nacional de Ciência e Tecnologia (INCT) do e-Universo (CNPq grant 465376/2014-2). Funding Information: This paper has gone through internal review by the DES collaboration. J.L. and M.S. were supported by DOE grant DE-FOA-0002424 and NSF grant AST-2108094. L.G. acknowledges financial support from the Spanish Ministerio de Ciencia e Innovación (MCIN), the Agencia Estatal de Investigación (AEI) 10.13039/501100011033, and the European Social Fund (ESF) Investing in your future under the 2019 Ramón y Cajal program RYC2019-027683-I and the PID2020-115253GA-I00 HOSTFLOWS project, from Centro Superior de Investigaciones Científicas (CSIC) under the PIE project 20215AT016, and the program Unidad de Excelencia María de Maeztu CEX2020-001058-M. This research used resources of the National Energy Research Scientific Computing Center (NERSC), a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Funding Information: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. Funding Information: Funding for the DES Projects has been provided by the U.S. Department of Energy, the U.S. National Science Foundation, the Ministry of Science and Education of Spain, the Science and Technology Facilities Council of the United Kingdom, the Higher Education Funding Council for England, the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign, the Kavli Institute of Cosmological Physics at the University of Chicago, the Center for Cosmology and Astro-Particle Physics at the Ohio State University, the Mitchell Institute for Fundamental Physics and Astronomy at Texas A&M University, Financiadora de Estudos e Projetos, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Conselho Nacional de Desenvolvimento Científico e Tecnológico and the Ministério da Ciência, Tecnologia e Inovação, the Deutsche Forschungsgemeinschaft, and the Collaborating Institutions in the Dark Energy Survey.

Identifiers

Local EPrints ID: 484164
URI: http://eprints.soton.ac.uk/id/eprint/484164
ISSN: 0004-6256
PURE UUID: 0f77984e-1b34-4fdb-88ca-8699e3e5b9a5
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820
ORCID for P. Wiseman: ORCID iD orcid.org/0000-0002-3073-1512
ORCID for M. Smith: ORCID iD orcid.org/0000-0002-3321-1432

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Date deposited: 10 Nov 2023 18:15
Last modified: 18 Mar 2024 03:43

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Contributors

Author: J. Lee
Author: M. Acevedo
Author: M. Sako
Author: M. Vincenzi
Author: D. Brout
Author: B. Sanchez
Author: R. Chen
Author: T.M. Davis
Author: M. Jarvis
Author: D. Scolnic
Author: H. Qu
Author: L. Galbany
Author: R. Kessler
Author: J. Lasker
Author: M. Sullivan ORCID iD
Author: P. Wiseman ORCID iD
Author: M. Aguena
Author: S. Allam
Author: O. Alves
Author: F. Andrade-Oliveira
Author: E. Bertin
Author: S. Bocquet
Author: D. Brooks
Author: D.L. Burke
Author: A. Carnero Rosell
Author: M. Carrasco Kind
Author: J. Carretero
Author: M. Costanzi
Author: L.N. da Costa
Author: M.E.S. Pereira
Author: J. De Vicente
Author: S. Desai
Author: H.T. Diehl
Author: P. Doel
Author: S. Everett
Author: I. Ferrero
Author: D. Friedel
Author: J. Frieman
Author: J. García-Bellido
Author: D.W. Gerdes
Author: D. Gruen
Author: R.A. Gruendl
Author: G. Gutierrez
Author: S.R. Hinton
Author: D.L. Hollowood
Author: K. Honscheid
Author: D.J. James
Author: S. Kent
Author: K. Kuehn
Author: N. Kuropatkin
Author: J. Mena-Fernández
Author: R. Miquel
Author: R.L.C. Ogando
Author: A. Palmese
Author: A. Pieres
Author: A.A. Plazas Malagón
Author: M. Raven
Author: K. Reil
Author: M Rodriguez-Monroy
Author: E. Sanchez
Author: V. Scarpine
Author: I. Sevilla-Noarbe
Author: M. Smith ORCID iD
Author: E. Suchyta
Author: G. Tarle
Author: C. To
Author: N Weaverdyck
Corporate Author: The Dark Energy Survey Collaboration

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