Paper

First Cosmology Results using Type Ia Supernovae from the Dark Energy Survey: Constraints on Cosmological Parameters

da Costa, L N, Gruendl, R A, Ogando, R L C, Avila, S, D'Andrea, C B, Garcia-Bellido, J, Glazebrook, K, Clocchiatti, A, Kim, A G, Wiseman, P, Sommer, N E, Romer, A K, Li, T S, Brout, D, Gaztanaga, E, Gupta, R R, Diehl, H T, Krause, E, Tarle, G, Wester, W, Gruen, D, Kuehn, K, Y -C Pan, Kirshner, R P, Asorey, J, M Carrasco Kind, Gonzalez-Gaitan, S, Menanteau, F, Hinton, S R, Carretero, J, Uddin, S A, Brown, P, Thomas, R C, Wolf, R C, James, D J, Avelino, A, Carollo, D, De Vicente, J, Mandel, K S, Johnson, M W G, Marriner, J, Goldstein, D A, Kessler, R, Foley, R J, Hollowood, D L, Smith, M, Flaugher, B, Scolnic, D, Yanny, B, Rykoff, E S, Martini, P, Davis, C, Davis, T M, Roodman, A, Lahav, O, Zhang, Y, Evrard, A E, Hoormann, J K, March, M, Tucker, B E, Cunha, C E, Kasai, E, Sevilla-Noarbe, I, Zhang, B, Lima, M, Calcino, J, Castander, F J, Hoyle, B, Marshall, J L, A Carnero Rosell, Bernstein, G M, Sako, M, Fosalba, P, DePoy, D L, Frieman, J, Palmese, A, Serrano, S, Kent, S, Miquel, R, Andersen, P, Lasker, J, Kuhlmann, S, Troxel, M A, Schubnell, M, Swann, E, Nichol, R C, Nord, B, Casas, R, Bechtol, K, Burke, D L, Bertin, E, Rozo, E, Bassett, B A, Suchyta, E, Honscheid, K, Sanch

2019

Overview

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).

• Publisher: Cornell University Library, arXiv.org
• Subject: Big Bang theory / Constraints / Cosmic microwave background / Cosmological constant / Cosmology / Dark energy / Equations of state / Parameters / Photometry / Red shift / Sky surveys (astronomy) / Supernovae