First Cosmology Results using Type Ia Supernovae from the Dark Energy Survey: Constraints on Cosmological Parameters
- Abbott, TMC;
- Allam, S;
- Andersen, P;
- Angus, C;
- Asorey, J;
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- Casas, R;
- Castander, FJ;
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- Diehl, HT;
- Doel, P;
- Drlica-Wagner, A;
- Eifler, TF;
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- Fernandez, E;
- Filippenko, AV;
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- Foley, RJ;
- Fosalba, P;
- Frieman, J;
- Galbany, L;
- García-Bellido, J;
- Gaztanaga, E;
- Giannantonio, T;
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- 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;
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- 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;
- Möller, A;
- Neilsen, E;
- Nichol, RC;
- Nord, B;
- Nugent, P;
- Ogando, RLC;
- Palmese, A;
- Pan, Y-C;
- Plazas, AA;
- Pursiainen, M;
- Romer, AK;
- Roodman, A;
- Rozo, E;
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- Wiseman, P;
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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 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).
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