SALT2 versus SALT3: updated model surfaces and their impacts on type Ia supernova cosmology

Taylor, G.; Jones, D. O.; Popovic, B.; Vincenzi, M.; Kessler, R.; Scolnic, D.; Dai, M.; Kenworthy, W. D.; Pierel, J. D. R.

doi:10.1093/mnras/stad320

Title: SALT2 versus SALT3: updated model surfaces and their impacts on type Ia supernova cosmology

Journal Article · 30 January 2023 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stad320 · OSTI ID:1958687

; Jones, D. O.; Popovic, B.;

; Kessler, R.;

; Dai, M.;

; Pierel, J. D. R.

ABSTRACT For the past decade, SALT2 has been the most common model used to fit Type Ia supernova (SN Ia) light curves for dark energy analyses. Recently, the SALT3 model was released, which upgraded a number of model features but has not yet been used for measurements of dark energy. Here, we evaluate the impact of switching from SALT2 to SALT3 for a SN cosmology analysis. We train SALT2 and SALT3 on an identical training sample of 1083 well-calibrated Type Ia supernovae, ensuring that any differences found come from the underlying model framework. We publicly release the results of this training (the SALT ‘surfaces’). We then run a cosmology analysis on the public Dark Energy Survey 3-Yr Supernova data sample (DES-SN3YR), and on realistic simulations of those data. We provide the first estimate of the SN + CMB systematic uncertainty arising from the choice of SALT model framework (i.e. SALT2 versus SALT3), Δw = + 0.001 ± 0.005 – a negligible effect at the current level of dark energy analyses. We also find that the updated surfaces are less sensitive to photometric calibration uncertainties than previous SALT2 surfaces, with the average spectral energy density dispersion reduced by a factor of two over optical wavelengths. This offers an opportunity to reduce the contribution of calibration errors to SN cosmology uncertainty budgets.

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Research Organization:: University of Chicago, IL (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0009924

OSTI ID:: 1958687

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 520; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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79 ASTRONOMY AND ASTROPHYSICS
dark energy
methods: data analysis
transients: supernovae

Title: SALT2 versus SALT3: updated model surfaces and their impacts on type Ia supernova cosmology

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