Skip to content

First cosmology results using Type Ia Supernovae from the Dark Energy Survey: constraints on cosmological parameters

Research output: Contribution to journalArticlepeer-review

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 Ωm = 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 Ωm = 0.321 +_ 0.018. For a flat w0aCDM 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).
Original languageEnglish
Article numberL30
Number of pages9
JournalAstrophysical Journal Letters
Issue number2
Publication statusPublished - 21 Feb 2019


  • First cosmology results using Type Ia Supernovae

    Rights statement: T. M. C. Abbott et al 2019 ApJL 872 L30. © 2019. The American Astronomical Society. All rights reserved. Reproduced by permission of the AAS.

    Final published version, 1.14 MB, PDF document

Relations Get citation (various referencing formats)

ID: 14018096