First Cosmology Results Using SNe Ia from the Dark Energy Survey: Analysis, Systematic Uncertainties, and Validation [First Cosmology Results Using Type IA Supernovae from the Dark Energy Survey: Analysis, Systematic Uncertainties, and Validation]

Brout, D.; Scolnic, D.; Kessler, R.; D’Andrea, C. B.; Davis, T. M.; Gupta, R. R.; Hinton, S. R.; Kim, A. G.; Lasker, J.; Lidman, C.; Macaulay, E.; Möller, A.; Nichol, R. C.; Sako, M.; Smith, M.; Sullivan, M.; Zhang, B.; Andersen, P.; Asorey, J.; Avelino, A.; Bassett, B. A.; Brown, P.; Calcino, J.; Carollo, D.; Challis, P.; Childress, M.; Clocchiatti, A.; Filippenko, A. V.; Foley, R. J.; Galbany, L.; Glazebrook, K.; Hoormann, J. K.; Kasai, E.; Kirshner, R. P.; Kuehn, K.; Kuhlmann, S.; Lewis, G. F.; Mandel, K. S.; March, M.; Miranda, V.; Morganson, E.; Muthukrishna, D.; Nugent, P.; Palmese, A.; Pan, Y. -C.; Sharp, R.; Sommer, N. E.; Swann, E.; Thomas, R. C.; Tucker, B. E.; Uddin, S. A.; Wester, W.; Abbott, T. M.  C.; Allam, S.; Annis, J.; Avila, S.; Bechtol, K.; Bernstein, G. M.; Bertin, E.; Brooks, D.; Burke, D. L.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Castander, F. J.; Cunha, C. E.; da Costa, L. N.; Davis, C.; De Vicente, J.; DePoy, D. L.; Desai, S.; Diehl, H. T.; Doel, P.; Drlica-Wagner, A.; Eifler, T. F.; Estrada, J.; Fernandez, E.; Flaugher, B.; Fosalba, P.; Frieman, J.; García-Bellido, J.; Gruen, D.; Gruendl, R. A.; Gutierrez, G.; Hartley, W. G.; Hollowood, D. L.; Honscheid, K.; Hoyle, B.; James, D. J.; Jarvis, M.; Jeltema, T.; Krause, E.; Lahav, O.; Li, T. S.; Lima, M.; Maia, M. A.  G.; Marriner, J.; Marshall, J. L.; Martini, P.; Menanteau, F.; Miller, C. J.; Miquel, R.; Ogando, R. L.  C.; Plazas, A. A.; Romer, A. K.; Roodman, A.; Rykoff, E. S.; Sanchez, E.; Santiago, B.; Scarpine, V.; Schubnell, M.; Serrano, S.; Sevilla-Noarbe, I.; Smith, R. C.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Swanson, M. E.  C.; Tarle, G.; Thomas, D.; Troxel, M. A.; Tucker, D. L.; Vikram, V.; Walker, A. R.; Zhang, Y.

doi:10.3847/1538-4357/ab08a0

Title: First Cosmology Results Using SNe Ia from the Dark Energy Survey: Analysis, Systematic Uncertainties, and Validation [First Cosmology Results Using Type IA Supernovae from the Dark Energy Survey: Analysis, Systematic Uncertainties, and Validation]

Journal Article · Tue Apr 02 00:00:00 EDT 2019 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/ab08a0· OSTI ID:1487398

; Scolnic, D.;

;

; Davis, T. M.; Gupta, R. R.;

; Kim, A. G.; Lasker, J.;

; Macaulay, E.; Möller, A.; Nichol, R. C.; Sako, M.; Smith, M.; Sullivan, M.; Zhang, B.; Andersen, P.; Asorey, J.; Avelino, A. more »

We present the analysis underpinning the measurement of cosmological parameters from 207 spectroscopically classified type Ia supernovae (SNe Ia) from the first three years of the Dark Energy Survey Supernova Program (DES-SN), spanning a redshift range of 0.017<0.849. We combine the DES-SN sample with an external sample of 122 low-redshift (z<0.1) SNe Ia, resulting in a "DES-SN3YR" sample of 329 SNe Ia. Our cosmological analyses are blinded: after combining our DES-SN3YR distances with constraints from the Cosmic Microwave Background (CMB; Planck Collaboration 2016), our uncertainties in the measurement of the dark energy equation-of-state parameter, w, are .042 (stat) and .059 (stat+syst) at 68% confidence. We provide a detailed systematic uncertainty budget, which has nearly equal contributions from photometric calibration, astrophysical bias corrections, and instrumental bias corrections. We also include several new sources of systematic uncertainty. While our sample is <1/3 the size of the Pantheon sample, our constraints on w are only larger by 1.4×, showing the impact of the DES SN Ia light curve quality. We find that the traditional stretch and color standardization parameters of the DES SNe Ia are in agreement with earlier SN Ia samples such as Pan-STARRS1 and the Supernova Legacy Survey. However, we find smaller intrinsic scatter about the Hubble diagram (0.077 mag). Interestingly, we find no evidence for a Hubble residual step ( 0.007 ± 0.018 mag) as a function of host galaxy mass for the DES subset, in 2.4σ tension with previous measurements. We also present novel validation methods of our sample using simulated SNe Ia inserted in DECam images and using large catalog-level simulations to test for biases in our analysis pipelines.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Contributing Organization:: DES Collaboration

Grant/Contract Number:: AC02-07CH11359; SC0019193; AC02-05CH11231; AC02-76SF00515; AC05-00OR22725

OSTI ID:: 1487398

Alternate ID(s):: OSTI ID: 1526592; OSTI ID: 1527092; OSTI ID: 1531226; OSTI ID: 1727377

Report Number(s):: arXiv:1811.02377; FERMILAB-PUB-18-541-AE; 1702374

Journal Information:: The Astrophysical Journal (Online), Vol. 874, Issue 2; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 51 works

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