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First cosmology results using SNe Ia from the Dark Energy Survey: analysis, systematic uncertainties, and validation

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First cosmology results using SNe Ia from the Dark Energy Survey : analysis, systematic uncertainties, and validation. / Dark Energy Survey Collaboration; D'Andrea, C. B.; Macaulay, E.; Nichol, R. C.; Swann, E.; Avila, S.; Thomas, D.

In: The Astrophysical Journal, Vol. 874, No. 2, 150, 02.04.2019.

Research output: Contribution to journalArticlepeer-review

Harvard

Dark Energy Survey Collaboration, D'Andrea, CB, Macaulay, E, Nichol, RC, Swann, E, Avila, S & Thomas, D 2019, 'First cosmology results using SNe Ia from the Dark Energy Survey: analysis, systematic uncertainties, and validation', The Astrophysical Journal, vol. 874, no. 2, 150. https://doi.org/10.3847/1538-4357/ab08a0

APA

Vancouver

Dark Energy Survey Collaboration, D'Andrea CB, Macaulay E, Nichol RC, Swann E, Avila S et al. First cosmology results using SNe Ia from the Dark Energy Survey: analysis, systematic uncertainties, and validation. The Astrophysical Journal. 2019 Apr 2;874(2). 150. https://doi.org/10.3847/1538-4357/ab08a0

Author

Dark Energy Survey Collaboration ; D'Andrea, C. B. ; Macaulay, E. ; Nichol, R. C. ; Swann, E. ; Avila, S. ; Thomas, D. / First cosmology results using SNe Ia from the Dark Energy Survey : analysis, systematic uncertainties, and validation. In: The Astrophysical Journal. 2019 ; Vol. 874, No. 2.

Bibtex

@article{c3c2546c2e4e49c3b2ec2310cbad65a4,
title = "First cosmology results using SNe Ia from the Dark Energy Survey: analysis, systematic uncertainties, and validation",
abstract = "We present the analysis underpinning the measurement of cosmological parameters from 207 spectroscopically classified SNe Ia from the first 3 years of the Dark Energy Survey Supernova Program (DES-SN), spanning a redshift range of 0.017 < z < 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, our uncertainties in the measurement of the dark energy equation-of-state parameter, w, are 0.042 (stat) and 0.059 (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 less than one-third 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.",
keywords = "astro-ph.CO, RCUK, STFC",
author = "{Dark Energy Survey Collaboration} and D. Brout and D. Scolnic and R. Kessler and D'Andrea, {C. B.} and Davis, {T. M.} and Gupta, {R. R.} and Hinton, {S. R.} and Kim, {A. G.} and J. Lasker and C. Lidman and E. Macaulay and A. M{\"o}ller and Nichol, {R. C.} and M. Sako and M. Smith and M. Sullivan and B. Zhang and P. Andersen and J. Asorey and A. Avelino and Bassett, {B. A.} and P. Brown and J. Calcino and D. Carollo and P. Challis and M. Childress and A. Clocchiatti and Filippenko, {A. V.} and Foley, {R. J.} and L. Galbany and K. Glazebrook and Hoormann, {J. K.} and E. Kasai and Kirshner, {R. P.} and K. Kuehn and S. Kuhlmann and Lewis, {G. F.} and Mandel, {K. S.} and M. March and V. Miranda and E. Morganson and D. Muthukrishna and P. Nugent and A. Palmese and Pan, {Y. -C.} and R. Sharp and Sommer, {N. E.} and E. Swann and S. Avila and D. Thomas",
note = "30 Pages, 18 Figures, 12 Tables. Submitted to ApJ. Comments welcome",
year = "2019",
month = apr,
day = "2",
doi = "10.3847/1538-4357/ab08a0",
language = "English",
volume = "874",
journal = "The Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing",
number = "2",

}

RIS

TY - JOUR

T1 - First cosmology results using SNe Ia from the Dark Energy Survey

T2 - analysis, systematic uncertainties, and validation

AU - Dark Energy Survey Collaboration

AU - Brout, D.

AU - Scolnic, D.

AU - Kessler, R.

AU - D'Andrea, C. B.

AU - Davis, T. M.

AU - Gupta, R. R.

AU - Hinton, S. R.

AU - Kim, A. G.

AU - Lasker, J.

AU - Lidman, C.

AU - Macaulay, E.

AU - Möller, A.

AU - Nichol, R. C.

AU - Sako, M.

AU - Smith, M.

AU - Sullivan, M.

AU - Zhang, B.

AU - Andersen, P.

AU - Asorey, J.

AU - Avelino, A.

AU - Bassett, B. A.

AU - Brown, P.

AU - Calcino, J.

AU - Carollo, D.

AU - Challis, P.

AU - Childress, M.

AU - Clocchiatti, A.

AU - Filippenko, A. V.

AU - Foley, R. J.

AU - Galbany, L.

AU - Glazebrook, K.

AU - Hoormann, J. K.

AU - Kasai, E.

AU - Kirshner, R. P.

AU - Kuehn, K.

AU - Kuhlmann, S.

AU - Lewis, G. F.

AU - Mandel, K. S.

AU - March, M.

AU - Miranda, V.

AU - Morganson, E.

AU - Muthukrishna, D.

AU - Nugent, P.

AU - Palmese, A.

AU - Pan, Y. -C.

AU - Sharp, R.

AU - Sommer, N. E.

AU - Swann, E.

AU - Avila, S.

AU - Thomas, D.

N1 - 30 Pages, 18 Figures, 12 Tables. Submitted to ApJ. Comments welcome

PY - 2019/4/2

Y1 - 2019/4/2

N2 - We present the analysis underpinning the measurement of cosmological parameters from 207 spectroscopically classified SNe Ia from the first 3 years of the Dark Energy Survey Supernova Program (DES-SN), spanning a redshift range of 0.017 < z < 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, our uncertainties in the measurement of the dark energy equation-of-state parameter, w, are 0.042 (stat) and 0.059 (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 less than one-third 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.

AB - We present the analysis underpinning the measurement of cosmological parameters from 207 spectroscopically classified SNe Ia from the first 3 years of the Dark Energy Survey Supernova Program (DES-SN), spanning a redshift range of 0.017 < z < 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, our uncertainties in the measurement of the dark energy equation-of-state parameter, w, are 0.042 (stat) and 0.059 (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 less than one-third 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.

KW - astro-ph.CO

KW - RCUK

KW - STFC

U2 - 10.3847/1538-4357/ab08a0

DO - 10.3847/1538-4357/ab08a0

M3 - Article

VL - 874

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 150

ER -

ID: 14019377