2 - LCFIT_MODEL: Light Curve Fitting SALT3 SED time-series

Overview

DES used SALT3 models for Type Ia Supernovae standardization. Here we release the trained models used for the DES-SN5YR Cosmological analysis.

SALT3 models

This folder includes the different SED time-series models used to fit the DES light-curves.

SALT3.DES5YR

This is the SALT3 model used for the Nominal DES-SN5YR cosmological analysis.

This model has been trained on the same SN sample presented by Kenworthy et al 2021 (https://arxiv.org/abs/2104.07795) with two major differences: - data have been recalibrated using the work by Supercal-Fragilistic (https://arxiv.org/abs/2112.03864), - we exclude CFA-U band data.

SALT3.DES5YR-SYS

These are the 10 SALT3 models (SALT3.MODEL000 to SALT3.MODEL009) used to incorporate Calibration and LC fitting Systematics in the DES-SN5YR cosmological analysis.

Each model is re-trained applying calibration uncertainties shifts to each filter’s zero-point and effective mean wavelength.

The calibration shifts are randoly drawn from the calibration uncertainty covariance matrix presented by Brout et al., 2021 (https://arxiv.org/abs/2112.03864, Matrix availabel at https://github.com/PantheonPlusSH0ES/DataRelease/blob/main/Pantheon%2B_Data/2_CALIBRATION/FRAGILISTIC_COVARIANCE.npz) The calibration shifts applied to build each of the SALT3 models presented here are in ./SALT3.DES5YR-SYS/calib_shiftlists

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