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

Abbot, T M C, Allam, S, Andersen, P, Angus, C, Asorey, J, Avelino, A, Avila, S, Bassett, B A, Bechtol, K, Bernstein, G M, Bertin, E, Brooks, D, Brout, D, Brown, P, Burke, D L, Romer, A K, DES collaboration, and others, (2019) First cosmology results using type Ia supernovae from the Dark Energy Survey: constraints on cosmological parameters. Astrophysical Journal Letters, 872 (2). L30 1-9. ISSN 2041-8213

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Abstract

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).

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Astronomy Centre
Subjects: Q Science > QC Physics
Depositing User: Alice Jackson
Date Deposited: 03 Apr 2019 08:05
Last Modified: 01 Jul 2019 17:15
URI: http://sro.sussex.ac.uk/id/eprint/82949

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