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  • Betoule, M. (author)

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

  • Article/chapterEnglish2014

Publisher, publication year, extent ...

  • 2014-08-08
  • EDP Sciences,2014
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-108382
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-108382URI
  • https://doi.org/10.1051/0004-6361/201423413DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • AuthorCount:63;
  • 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 < z < 0.4), and three years from SNLS (0.2 < z < 1), and it totals 740 spectroscopically confirmed type la 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: 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.

Subject headings and genre

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  • Kessler, R. (author)
  • Guy, J. (author)
  • Mosher, J. (author)
  • Hardin, D. (author)
  • Biswas, R. (author)
  • Astier, P. (author)
  • El-Hage, P. (author)
  • Konig, M. (author)
  • Kuhlmann, S. (author)
  • Marriner, J. (author)
  • Pain, R. (author)
  • Regnault, N. (author)
  • Balland, C. (author)
  • Bassett, B. A. (author)
  • Brown, P. J. (author)
  • Campbell, H. (author)
  • Carlberg, R. G. (author)
  • Cellier-Holzern, F. (author)
  • Cinabro, D. (author)
  • Conley, A. (author)
  • D'Andrea, C. B. (author)
  • DePoy, D. L. (author)
  • Doi, M. (author)
  • Ellis, R. S. (author)
  • Fabbro, S. (author)
  • Filippenko, A. V. (author)
  • Foley, R. J. (author)
  • Frieman, J. A. (author)
  • Fouchez, D. (author)
  • Galbany, L. (author)
  • Goobar, ArielStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)ariel (author)
  • Gupta, R. R. (author)
  • Hill, G. J. (author)
  • Hlozek, R. (author)
  • Hogan, C. J. (author)
  • Hook, I. M. (author)
  • Howell, D. A. (author)
  • Jha, S. W. (author)
  • Le Guillou, L. (author)
  • EGENLeloudas, G. (author)
  • Lidrnan, C. (author)
  • Marshall, J. L. (author)
  • Moeller, A. (author)
  • Mourao, A. M. (author)
  • Neveu, J. (author)
  • Nichol, R. (author)
  • Olmstead, M. D. (author)
  • Palanque-Delabrouille, N. (author)
  • Perlinutter, S. (author)
  • Prieto, J. L. (author)
  • Pritchet, C. J. (author)
  • Richinond, M. (author)
  • Riess, A. G. (author)
  • Ruhlmann-Kleider, V. (author)
  • Sako, M. (author)
  • Sehahmaneche, K. (author)
  • Schneider, D. P. (author)
  • Smith, M. (author)
  • Sollerman, JesperStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)solle (author)
  • Sullivan, M. (author)
  • Walton, N. A. (author)
  • Wheeler, C. J. (author)
  • Stockholms universitetFysikum (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics: EDP Sciences568, s. A22-0004-63611432-0746

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