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First cosmology results using Type Ia Supernovae from the Dark Energy Survey: Constraints on cosmological parameters

First cosmology results using Type Ia Supernovae from the Dark Energy Survey: Constraints on cosmological parameters
First cosmology results using Type Ia Supernovae from the Dark Energy Survey: Constraints on cosmological parameters
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 ${{\rm{\Omega }}}_{{\rm{m}}}=0.331\pm 0.038$. 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 $w=-0.978\pm 0.059$, and ${{\rm{\Omega }}}_{{\rm{m}}}=0.321\pm 0.018$. For a flat w 0 w a CDM model, and combining probes from SN Ia, CMB and baryon acoustic oscillations, we find ${w}_{0}=-0.885\pm 0.114$ and ${w}_{a}=-0.387\,\pm \,0.430$. These results are in agreement with a cosmological constant and with previous constraints using SNe Ia (Pantheon, JLA).
2041-8205
Abbott, T.M.C.
6afa6308-fd36-4189-aef0-d86c784311d9
Allam, S.
ddcc4444-2731-4ed7-b2f0-10dc1b54fa8c
Andersen, P.
df795fcd-adb5-416f-be03-51c250c4a778
Sullivan, Mark
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Childress, Michael
7d0e608c-b9de-4631-bab5-7a2b810a0a2b
Smith, Mathew
8bdc74e1-a37b-434d-ae75-82763109bf7a
Angus, Charlotte
7a190f2d-9816-4960-8695-e694c39f099c
Wiseman, Philip
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Pursiainen, Miika, Aleksi
bc6f0ca1-8318-4c4a-8123-27cb6a88a1c9
The DES Collaboration
Abbott, T.M.C.
6afa6308-fd36-4189-aef0-d86c784311d9
Allam, S.
ddcc4444-2731-4ed7-b2f0-10dc1b54fa8c
Andersen, P.
df795fcd-adb5-416f-be03-51c250c4a778
Sullivan, Mark
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Childress, Michael
7d0e608c-b9de-4631-bab5-7a2b810a0a2b
Smith, Mathew
8bdc74e1-a37b-434d-ae75-82763109bf7a
Angus, Charlotte
7a190f2d-9816-4960-8695-e694c39f099c
Wiseman, Philip
865f95f8-2200-46a8-bd5e-3ee30bb44072
Pursiainen, Miika, Aleksi
bc6f0ca1-8318-4c4a-8123-27cb6a88a1c9

Abbott, T.M.C., Allam, S. and Andersen, P. , The DES Collaboration (2019) First cosmology results using Type Ia Supernovae from the Dark Energy Survey: Constraints on cosmological parameters. The Astrophysical Journal Letters, 872 (2), [L30]. (doi:10.3847/2041-8213/ab04fa).

Record type: Article

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 ${{\rm{\Omega }}}_{{\rm{m}}}=0.331\pm 0.038$. 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 $w=-0.978\pm 0.059$, and ${{\rm{\Omega }}}_{{\rm{m}}}=0.321\pm 0.018$. For a flat w 0 w a CDM model, and combining probes from SN Ia, CMB and baryon acoustic oscillations, we find ${w}_{0}=-0.885\pm 0.114$ and ${w}_{a}=-0.387\,\pm \,0.430$. These results are in agreement with a cosmological constant and with previous constraints using SNe Ia (Pantheon, JLA).

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1811.02374 - Accepted Manuscript
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Accepted/In Press date: 6 February 2019
e-pub ahead of print date: 21 February 2019
Published date: February 2019

Identifiers

Local EPrints ID: 429875
URI: http://eprints.soton.ac.uk/id/eprint/429875
ISSN: 2041-8205
PURE UUID: 90d2d96c-d111-4ef4-a7a7-c8b8e84324ff
ORCID for Mark Sullivan: ORCID iD orcid.org/0000-0001-9053-4820
ORCID for Mathew Smith: ORCID iD orcid.org/0000-0002-3321-1432

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Date deposited: 08 Apr 2019 16:30
Last modified: 07 Oct 2020 02:06

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Contributors

Author: T.M.C. Abbott
Author: S. Allam
Author: P. Andersen
Author: Mark Sullivan ORCID iD
Author: Michael Childress
Author: Mathew Smith ORCID iD
Author: Charlotte Angus
Author: Philip Wiseman
Corporate Author: The DES Collaboration

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