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The Dark Energy Survey: cosmology results with ~1500 new high-redshift type Ia supernovae using the full 5-year dataset

The Dark Energy Survey: cosmology results with ~1500 new high-redshift type Ia supernovae using the full 5-year dataset
The Dark Energy Survey: cosmology results with ~1500 new high-redshift type Ia supernovae using the full 5-year dataset
We present cosmological constraints from the sample of Type Ia supernovae (SN Ia) discovered during the full five years of the Dark Energy Survey (DES) Supernova Program. In contrast to most previous cosmological samples, in which SN are classified based on their spectra, we classify the DES SNe using a machine learning algorithm applied to their light curves in four photometric bands. Spectroscopic redshifts are acquired from a dedicated follow-up survey of the host galaxies. After accounting for the likelihood of each SN being a SN Ia, we find 1635 DES SN in the redshift range $0.100.5$ SNe compared to the previous leading compilation of Pantheon+, and results in the tightest cosmological constraints achieved by any SN data set to date. To derive cosmological constraints we combine the DES supernova data with a high-quality external low-redshift sample consisting of 194 SNe Ia spanning $0.025
astro-ph.CO
Frohmaier, C.
e752dabb-bbdc-430d-ac86-861ea58d0e1b
Kelsey, L.
e468815b-9246-4e0f-a6d5-b037765590e4
Smith, M.
8bdc74e1-a37b-434d-ae75-82763109bf7a
Sullivan, M.
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Toy, M.
5ef48181-2bd7-4207-9215-9764f4184aba
Vincenzi, M.
a15a3563-56f2-4692-b192-36b745e67d0b
Wiseman, P.
865f95f8-2200-46a8-bd5e-3ee30bb44072
DES Collaboration
Frohmaier, C.
e752dabb-bbdc-430d-ac86-861ea58d0e1b
Kelsey, L.
e468815b-9246-4e0f-a6d5-b037765590e4
Smith, M.
8bdc74e1-a37b-434d-ae75-82763109bf7a
Sullivan, M.
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Toy, M.
5ef48181-2bd7-4207-9215-9764f4184aba
Vincenzi, M.
a15a3563-56f2-4692-b192-36b745e67d0b
Wiseman, P.
865f95f8-2200-46a8-bd5e-3ee30bb44072

[Unknown type: UNSPECIFIED]

Record type: UNSPECIFIED

Abstract

We present cosmological constraints from the sample of Type Ia supernovae (SN Ia) discovered during the full five years of the Dark Energy Survey (DES) Supernova Program. In contrast to most previous cosmological samples, in which SN are classified based on their spectra, we classify the DES SNe using a machine learning algorithm applied to their light curves in four photometric bands. Spectroscopic redshifts are acquired from a dedicated follow-up survey of the host galaxies. After accounting for the likelihood of each SN being a SN Ia, we find 1635 DES SN in the redshift range $0.100.5$ SNe compared to the previous leading compilation of Pantheon+, and results in the tightest cosmological constraints achieved by any SN data set to date. To derive cosmological constraints we combine the DES supernova data with a high-quality external low-redshift sample consisting of 194 SNe Ia spanning $0.025

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2401.02929v2 - Author's Original
Available under License Other.
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e-pub ahead of print date: 5 January 2024
Published date: 5 January 2024
Additional Information: 22 pages, 12 figures; Submitted to ApJ; v2 updates reference to companion paper Vincenzi et al. 2401.02945 and updates authors
Keywords: astro-ph.CO

Identifiers

Local EPrints ID: 487416
URI: http://eprints.soton.ac.uk/id/eprint/487416
PURE UUID: 0e04cd4f-690e-4ead-adca-79a676f9d667
ORCID for C. Frohmaier: ORCID iD orcid.org/0000-0001-9553-4723
ORCID for M. Smith: ORCID iD orcid.org/0000-0002-3321-1432
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820
ORCID for P. Wiseman: ORCID iD orcid.org/0000-0002-3073-1512

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Date deposited: 20 Feb 2024 12:47
Last modified: 18 Apr 2024 02:00

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Contributors

Author: C. Frohmaier ORCID iD
Author: L. Kelsey
Author: M. Smith ORCID iD
Author: M. Sullivan ORCID iD
Author: M. Toy
Author: M. Vincenzi
Author: P. Wiseman ORCID iD
Corporate Author: DES Collaboration

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