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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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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-Holzern, 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 - Lidrnan, C.
AU - Marshall, J. L.
AU - Moeller, A.
AU - Mourao, A. M.
AU - Neveu, J.
AU - Nichol, R.
AU - Olmstead, M. D.
AU - Palanque-Delabrouille, N.
AU - Perlinutter, S.
AU - Prieto, J. L.
AU - Pritchet, C. J.
AU - Richinond, M.
AU - Riess, A. G.
AU - Ruhlmann-Kleider, V.
AU - Sako, M.
AU - Sehahmaneche, 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 la 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-11 (0.05 Methods. We followed the methods and assumptions of the SNLS three-year data analysis except for the following important improvements: I) the addition of the full SDSS-II spectroscopically-confirmed SN la 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 la light curves.Results. We produce recalibrated SN la light curves and associated distances for the SDSS-II and SNLS samples. The large SOSS-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 ACDM cosmology, we find Omega(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 1.8 sigma (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 omega = -1.018 +/- 0,057 (sral+sys) for a fiat universe. Adding baryon acoustic oscillation distance measurements gives similar constraints: omega = 59 -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 la 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-11 (0.05 Methods. We followed the methods and assumptions of the SNLS three-year data analysis except for the following important improvements: I) the addition of the full SDSS-II spectroscopically-confirmed SN la 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 la light curves.Results. We produce recalibrated SN la light curves and associated distances for the SDSS-II and SNLS samples. The large SOSS-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 ACDM cosmology, we find Omega(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 1.8 sigma (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 omega = -1.018 +/- 0,057 (sral+sys) for a fiat universe. Adding baryon acoustic oscillation distance measurements gives similar constraints: omega = 59 -1.027 0.055. Our supernova measurements provide the most stringent constraints to date on the nature of dark energy.
KW - cosmology: observations
KW - distance scale dark energy
KW - DIGITAL SKY SURVEY
KW - HUBBLE-SPACE-TELESCOPE
KW - BARYON ACOUSTIC-OSCILLATIONS
KW - IA LIGHT CURVES
KW - MICROWAVE BACKGROUND ANISOTROPIES
KW - PHOTOMETRY DATA RELEASE
KW - HOST GALAXY PROPERTIES
KW - DARK ENERGY SURVEY
KW - LEGACY SURVEY
KW - LOW-REDSHIFT
U2 - 10.1051/0004-6361/201423413
DO - 10.1051/0004-6361/201423413
M3 - Journal article
VL - 568
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
SN - 1432-0746
M1 - 22
ER -