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

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

doi:10.1051/0004-6361/201423413

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

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

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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 Ω_m =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 1.8σ (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.

Original language	English (US)
Article number	A22
Journal	Astronomy and Astrophysics
Volume	568
DOIs	https://doi.org/10.1051/0004-6361/201423413
State	Published - Aug 2014

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361/201423413

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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., ... Wheeler, C. J. (2014). Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples. Astronomy and Astrophysics, 568, Article A22. https://doi.org/10.1051/0004-6361/201423413

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

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 m =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 1.8σ (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.",

author = "M. Betoule and R. Kessler and J. Guy and J. Mosher and D. Hardin and R. Biswas and P. Astier and P. El-Hage and M. Konig and S. Kuhlmann and J. Marriner and R. Pain and N. Regnault and C. Balland and Bassett, {B. A.} and Brown, {P. J.} and H. Campbell and Carlberg, {R. G.} and F. Cellier-Holzem and D. Cinabro and A. Conley and D'Andrea, {C. B.} and Depoy, {D. L.} and M. Doi and Ellis, {R. S.} and S. Fabbro and Filippenko, {A. V.} and Foley, {R. J.} and Frieman, {J. A.} and D. Fouchez and L. Galbany and A. Goobar and Gupta, {R. R.} and Hill, {G. J.} and R. Hlozek and Hogan, {C. J.} and Hook, {I. M.} and Howell, {D. A.} and Jha, {S. W.} and {Le Guillou}, L. and G. Leloudas and C. Lidman and Marshall, {J. L.} and A. M{\"o}ller and Mour{\~a}o, {A. M.} and J. Neveu and R. Nichol and Olmstead, {M. D.} and N. Palanque-Delabrouille and S. Perlmutter and Prieto, {J. L.} and Pritchet, {C. J.} and M. Richmond and Riess, {A. G.} and V. Ruhlmann-Kleider and M. Sako and K. Schahmaneche and Schneider, {D. P.} and M. Smith and J. Sollerman and M. Sullivan and Walton, {N. A.} and Wheeler, {C. J.}",

year = "2014",

month = aug,

doi = "10.1051/0004-6361/201423413",

language = "English (US)",

volume = "568",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

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, BA, Brown, PJ, Campbell, H, Carlberg, RG, Cellier-Holzem, F, Cinabro, D, Conley, A, D'Andrea, CB, Depoy, DL, Doi, M, Ellis, RS, Fabbro, S, Filippenko, AV, Foley, RJ, Frieman, JA, Fouchez, D, Galbany, L, Goobar, A, Gupta, RR, Hill, GJ, Hlozek, R, Hogan, CJ, Hook, IM, Howell, DA, Jha, SW, Le Guillou, L, Leloudas, G, Lidman, C, Marshall, JL, Möller, A, Mourão, AM, Neveu, J, Nichol, R, Olmstead, MD, Palanque-Delabrouille, N, Perlmutter, S, Prieto, JL, Pritchet, CJ, Richmond, M, Riess, AG, Ruhlmann-Kleider, V, Sako, M, Schahmaneche, K, Schneider, DP, Smith, M, Sollerman, J, Sullivan, M, Walton, NA & Wheeler, CJ 2014, 'Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples', Astronomy and Astrophysics, vol. 568, A22. https://doi.org/10.1051/0004-6361/201423413

TY - JOUR

T1 - Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples

AU - Betoule, M.

AU - Kessler, R.

AU - Guy, J.

AU - Mosher, J.

AU - Hardin, D.

AU - Biswas, R.

AU - Astier, P.

AU - El-Hage, P.

AU - Konig, M.

AU - Kuhlmann, S.

AU - Marriner, J.

AU - Pain, R.

AU - Regnault, N.

AU - Balland, C.

AU - Bassett, B. A.

AU - Brown, P. J.

AU - Campbell, H.

AU - Carlberg, R. G.

AU - Cellier-Holzem, F.

AU - Cinabro, D.

AU - Conley, A.

AU - D'Andrea, C. B.

AU - Depoy, D. L.

AU - Doi, M.

AU - Ellis, R. S.

AU - Fabbro, S.

AU - Filippenko, A. V.

AU - Foley, R. J.

AU - Frieman, J. A.

AU - Fouchez, D.

AU - Galbany, L.

AU - Goobar, A.

AU - Gupta, R. R.

AU - Hill, G. J.

AU - Hlozek, R.

AU - Hogan, C. J.

AU - Hook, I. M.

AU - Howell, D. A.

AU - Jha, S. W.

AU - Le Guillou, L.

AU - Leloudas, G.

AU - Lidman, C.

AU - Marshall, J. L.

AU - Möller, A.

AU - Mourão, A. M.

AU - Neveu, J.

AU - Nichol, R.

AU - Olmstead, M. D.

AU - Palanque-Delabrouille, N.

AU - Perlmutter, S.

AU - Prieto, J. L.

AU - Pritchet, C. J.

AU - Richmond, M.

AU - Riess, A. G.

AU - Ruhlmann-Kleider, V.

AU - Sako, M.

AU - Schahmaneche, K.

AU - Schneider, D. P.

AU - Smith, M.

AU - Sollerman, J.

AU - Sullivan, M.

AU - Walton, N. A.

AU - Wheeler, C. J.

PY - 2014/8

Y1 - 2014/8

N2 - 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 m =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 1.8σ (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.

AB - 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 m =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 1.8σ (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.

UR - http://www.scopus.com/inward/record.url?scp=84905723106&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84905723106&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201423413

DO - 10.1051/0004-6361/201423413

M3 - Article

AN - SCOPUS:84905723106

SN - 0004-6361

VL - 568

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A22

ER -

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

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