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SALT3: An ImprovedType Ia SupernovaModel for MeasuringCosmic Distances W. D. KenworthyD. O. JonesMi Dai2021 год

SALT3: An Improved Type Ia Supernova Model for Measuring Cosmic Distances
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Аннотация: A spectral-energy distribution (SED) model for Type Ia supernovae (SNe Ia) is a critical tool for measuring precise and accurate distances across a large redshift range and constraining cosmological parameters. We present an improved model framework, SALT3, which has several advantages over current models including the leading SALT2 model (SALT2.4). While SALT3 has a similar philosophy, it differs from SALT2 by having improved estimation of uncertainties, better separation of color and light-curve stretch, and a publicly available training code. We present the application of our training method on a cross-calibrated compilation of 1083 SNe with 1207 spectra. Our compilation is $2.5\times$ larger than the SALT2 training sample and has greatly reduced calibration uncertainties. The resulting trained SALT3.K21 model has an extended wavelength range $2000$-$11000$ angstroms (1800 angstroms redder) and reduced uncertainties compared to SALT2, enabling accurate use of low-$z$ $I$ and $iz$ photometric bands. Including these previously discarded bands, SALT3.K21 reduces the Hubble scatter of the low-z Foundation and CfA3 samples by 15% and 10%, respectively. To check for potential systematic uncertainties we compare distances of low ($0.01
Год издания: 2021
Авторы: W. D. Kenworthy, D. O. Jones, Mi Dai, R. Keßler, D. Scolnic, Dillon Brout, M. R. Siebert, J. D. R. Pierel, K. Dettman, G. Dimitriadis, R. J. Foley, Saurabh W. Jha, Y. C. Pan, Adam G. Riess, S. Rodney, C. Rojas-Bravo
Издательство: IOP Publishing
Источник: The Astrophysical Journal
Ключевые слова: Gamma-ray bursts and supernovae, Stellar, planetary, and galactic studies, CCD and CMOS Imaging Sensors
Другие ссылки: The Astrophysical Journal (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (HTML)
OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (HTML)
DataCite API (HTML)