First Cosmology Results using Type Ia Supernovae from the Dark Energy Survey: Constraints on Cosmological Parameters
© 2019. The American Astronomical Society. All rights reserved. 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 ΛCDM model we find a matter density Ω 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 ω m = 0.321 ± 0.018. For a flat w 0 w a CDM model, and combining probes from SN Ia, CMB and baryon acoustic oscillations, we find w0 = -0.885 ± 0.114 and w a = -0.387 ± 0.430. These results are in agreement with a cosmological constant and with previous constraints using SNe Ia (Pantheon, JLA).
Abbott, TMC; Allam, S; Andersen, P; Angus, C; Asorey, J; Avelino, A; Avila, S; Bassett, BA; Bechtol, K; Bernstein, GM; Bertin, E; Brooks, D; Brout, D; Brown, P; Burke, DL; Calcino, J; Rosell, AC; Carollo, D; Carrasco Kind, M; Carretero, J; Casas, R; Castander, FJ; Cawthon, R; Challis, P; Childress, M; Clocchiatti, A; Cunha, CE; D'Andrea, CB; Da Costa, LN; Davis, C; Davis, TM; De Vicente, J; Depoy, DL; Desai, S; Diehl, HT; Doel, P; Drlica-Wagner, A; Eifler, TF; Evrard, AE; Fernandez, E; Filippenko, AV; Finley, DA; Flaugher, B; Foley, RJ; Fosalba, P; Frieman, J; Galbany, L; García-Bellido, J; Gaztanaga, E; Giannantonio, T; Glazebrook, K; Goldstein, DA; González-Gaitán, S; Gruen, D; Gruendl, RA; Gschwend, J; Gupta, RR; Gutierrez, G; Hartley, WG; Hinton, SR; Hollowood, DL; Honscheid, K; Hoormann, JK; Hoyle, B; James, DJ; Jeltema, T; Johnson, MWG; Johnson, MD; Kasai, E; Kent, S; Kessler, R; Kim, AG; Kirshner, RP; Kovacs, E; Krause, E; Kron, R; Kuehn, K; Kuhlmann, S; Kuropatkin, N; Lahav, O; Lasker, J; Lewis, GF; Li, TS; Lidman, C; Lima, M; Lin, H; Macaulay, E; Maia, MAG; Mandel, KS; March, M; Marriner, J; Marshall, JL; Martini, P; Menanteau, F; Miller, CJ; Miquel, R; Miranda, V; Mohr, JJ; Morganson, E; Muthukrishna, D
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