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Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples

Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
Aims: We present cosmological constraints from a joint analysis of type Ia supernova (SN Ia) observations obtained by the SDSS-II and SNLS collaborations. The dataset includes several low-redshift samples (z< 0.1), all three seasons from the SDSS-II (0.05 <z< 0.4), and three years from SNLS (0.2 <z< 1), and it totals 740 spectroscopically confirmed type Ia supernovae with high-quality light curves.
Methods: We followed the methods and assumptions of the SNLS three-year data analysis except for the following important improvements: 1) the addition of the full SDSS-II spectroscopically-confirmed SN Ia sample in both the training of the SALT2 light-curve model and in the Hubble diagram analysis (374 SNe); 2) intercalibration of the SNLS and SDSS surveys and reduced systematic uncertainties in the photometric calibration, performed blindly with respect to the cosmology analysis; and 3) a thorough investigation of systematic errors associated with the SALT2 modeling of SN Ia light curves.
Results: We produce recalibrated SN Ia light curves and associated distances for the SDSS-II and SNLS samples. The large SDSS-II sample provides an effective, independent, low-z anchor for the Hubble diagram and reduces the systematic error from calibration systematics in the low-z SN sample. For a flat ΛCDM cosmology, we find Ωm =0.295 ± 0.034 (stat+sys), a value consistent with the most recent cosmic microwave background (CMB) measurement from the Planck and WMAP experiments. Our result is 1.8 σ  (stat+sys) different than the previously published result of SNLS three-year data. The change is due primarily to improvements in the SNLS photometric calibration. When combined with CMB constraints, we measure a constant dark-energy equation of state parameter w = -1.018 ± 0.057 (stat+sys) for a flat universe. Adding baryon acoustic oscillation distance measurements gives similar constraints: w = -1.027 ± 0.055. Our supernova measurements provide the most stringent constraints to date on the nature of dark energy.
0004-6361
1-32
Betoule, M.
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Sullivan, M.
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Betoule, M.
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Kessler, R.
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Guy, J.
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Mosher, J.
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Hardin, D.
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Biswas, R.
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Astier, P.
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El-Hage, P.
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Konig, M.
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Kuhlmann, S.
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Marriner, J.
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Pain, R.
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Regnault, N.
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Balland, C.
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Bassett, B.A.
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Brown, P.J.
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Campbell, H.
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Carlberg, R.G.
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Cellier-Holzem, F.
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Cinabro, D.
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DePoy, D.L.
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Doi, M.
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Filippenko, A.V.
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Fouchez, D.
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Goobar, A.
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Gupta, R.R.
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Hill, G.J.
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Hogan, C.J.
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Leloudas, G.
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Neveu, J.
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Nichol, R.
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Olmstead, M.D.
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Sullivan, M.
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Betoule, M., Kessler, R., Guy, J., Mosher, J., Hardin, D., Biswas, R., Astier, P., El-Hage, P., Konig, M., Kuhlmann, S., Marriner, J., Pain, R., Regnault, N., Balland, C., Bassett, B.A., Brown, P.J., Campbell, H., Carlberg, R.G., Cellier-Holzem, F., Cinabro, D., Conley, A., D’Andrea, C.B., DePoy, D.L., Doi, M., Ellis, R.S., Fabbro, S., Filippenko, A.V., Foley, R.J., Frieman, J.A., Fouchez, D., Galbany, L., Goobar, A., Gupta, R.R., Hill, G.J., Hlozek, R., Hogan, C.J., Hook, I.M., Howell, D.A., Jha, S.W., Le Guillou, L., Leloudas, G., Lidman, C., Marshall, J.L., Möller, A., Mourão, A.M., Neveu, J., Nichol, R., Olmstead, M.D., Palanque-Delabrouille, N., Perlmutter, S., Prieto, J.L., Pritchet, C.J., Richmond, M., Riess, A.G., Ruhlmann-Kleider, V., Sako, M., Schahmaneche, K., Schneider, D.P., Smith, M., Sollerman, J., Sullivan, M., Walton, N.A. and Wheeler, C.J. (2014) Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples. Astronomy & Astrophysics, 568 (A22), 1-32. (doi:10.1051/0004-6361/201423413).

Record type: Article

Abstract

Aims: We present cosmological constraints from a joint analysis of type Ia supernova (SN Ia) observations obtained by the SDSS-II and SNLS collaborations. The dataset includes several low-redshift samples (z< 0.1), all three seasons from the SDSS-II (0.05 <z< 0.4), and three years from SNLS (0.2 <z< 1), and it totals 740 spectroscopically confirmed type Ia supernovae with high-quality light curves.
Methods: We followed the methods and assumptions of the SNLS three-year data analysis except for the following important improvements: 1) the addition of the full SDSS-II spectroscopically-confirmed SN Ia sample in both the training of the SALT2 light-curve model and in the Hubble diagram analysis (374 SNe); 2) intercalibration of the SNLS and SDSS surveys and reduced systematic uncertainties in the photometric calibration, performed blindly with respect to the cosmology analysis; and 3) a thorough investigation of systematic errors associated with the SALT2 modeling of SN Ia light curves.
Results: We produce recalibrated SN Ia light curves and associated distances for the SDSS-II and SNLS samples. The large SDSS-II sample provides an effective, independent, low-z anchor for the Hubble diagram and reduces the systematic error from calibration systematics in the low-z SN sample. For a flat ΛCDM cosmology, we find Ωm =0.295 ± 0.034 (stat+sys), a value consistent with the most recent cosmic microwave background (CMB) measurement from the Planck and WMAP experiments. Our result is 1.8 σ  (stat+sys) different than the previously published result of SNLS three-year data. The change is due primarily to improvements in the SNLS photometric calibration. When combined with CMB constraints, we measure a constant dark-energy equation of state parameter w = -1.018 ± 0.057 (stat+sys) for a flat universe. Adding baryon acoustic oscillation distance measurements gives similar constraints: w = -1.027 ± 0.055. Our supernova measurements provide the most stringent constraints to date on the nature of dark energy.

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Accepted/In Press date: 9 April 2014
Published date: August 2014
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 394577
URI: https://eprints.soton.ac.uk/id/eprint/394577
ISSN: 0004-6361
PURE UUID: 268d1cda-5737-459b-8ecd-473ebda93b71
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 20 May 2016 13:24
Last modified: 15 Aug 2019 00:36

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Contributors

Author: M. Betoule
Author: R. Kessler
Author: J. Guy
Author: J. Mosher
Author: D. Hardin
Author: R. Biswas
Author: P. Astier
Author: P. El-Hage
Author: M. Konig
Author: S. Kuhlmann
Author: J. Marriner
Author: R. Pain
Author: N. Regnault
Author: C. Balland
Author: B.A. Bassett
Author: P.J. Brown
Author: H. Campbell
Author: R.G. Carlberg
Author: F. Cellier-Holzem
Author: D. Cinabro
Author: A. Conley
Author: C.B. D’Andrea
Author: D.L. DePoy
Author: M. Doi
Author: R.S. Ellis
Author: S. Fabbro
Author: A.V. Filippenko
Author: R.J. Foley
Author: J.A. Frieman
Author: D. Fouchez
Author: L. Galbany
Author: A. Goobar
Author: R.R. Gupta
Author: G.J. Hill
Author: R. Hlozek
Author: C.J. Hogan
Author: I.M. Hook
Author: D.A. Howell
Author: S.W. Jha
Author: L. Le Guillou
Author: G. Leloudas
Author: C. Lidman
Author: J.L. Marshall
Author: A. Möller
Author: A.M. Mourão
Author: J. Neveu
Author: R. Nichol
Author: M.D. Olmstead
Author: N. Palanque-Delabrouille
Author: S. Perlmutter
Author: J.L. Prieto
Author: C.J. Pritchet
Author: M. Richmond
Author: A.G. Riess
Author: V. Ruhlmann-Kleider
Author: M. Sako
Author: K. Schahmaneche
Author: D.P. Schneider
Author: M. Smith
Author: J. Sollerman
Author: M. Sullivan ORCID iD
Author: N.A. Walton
Author: C.J. Wheeler

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