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First cosmology results using type Ia supernovae from the Dark Energy Survey: constraints on cosmological parameters

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journal contribution
posted on 2023-06-09, 17:26 authored by T M C Abbot, S Allam, P Andersen, C Angus, J Asorey, A Avelino, S Avila, B A Bassett, K Bechtol, G M Bernstein, E Bertin, D Brooks, D Brout, P Brown, D L Burke, Kathy RomerKathy Romer, DES collaboration, others
We present the first cosmological parameter constraints using measurements of type Ia supernovae (SNe Ia) from the Dark Energy Survey Supernova Program (DES-SN). The analysis uses a subsample of 207 spectroscopically confirmed SNe Ia from the first three years of DES-SN, combined with a low-redshift sample of 122 SNe from the literature. Our "DES-SN3YR" result from these 329 SNe Ia is based on a series of companion analyses and improvements covering SN Ia discovery, spectroscopic selection, photometry, calibration, distance bias corrections, and evaluation of systematic uncertainties. For a flat LCDM model we find a matter density Omega_m = 0.331 +_ 0.038. For a flat wCDM model, and combining our SN Ia constraints with those from the cosmic microwave background (CMB), we find a dark energy equation of state w = -0.978 +_ 0.059, and Omega_m = 0.321 +_ 0.018. For a flat w0waCDM model, and combining probes from SN Ia, CMB and baryon acoustic oscillations, we find w0 = -0.885 +_ 0.114 and wa = -0.387 +_ 0.430. These results are in agreement with a cosmological constant and with previous constraints using SNe Ia (Pantheon, JLA).

History

Publication status

  • Published

File Version

  • Published version

Journal

Astrophysical Journal Letters

ISSN

2041-8213

Publisher

American Astronomical Society

Issue

2

Volume

872

Page range

L30 1-9

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Astronomy Centre Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2019-04-03

First Open Access (FOA) Date

2019-04-03

First Compliant Deposit (FCD) Date

2019-04-02

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