SUPERNOVA CONSTRAINTS AND SYSTEMATIC UNCERTAINTIES FROM THE FIRST THREE YEARS OF THE SUPERNOVA LEGACY SURVEY

By A. Conley, J. Guy, M. Sullivan, N. Regnault, P. Astier, C. Balland, S. Basa, R. Carlberg, D. Fouchez, D. Hardin and 26 more. 2011

677 citations recorded by the source corpus.

We combine high-redshift Type Ia supernovae from the first three years of the Supernova Legacy Survey (SNLS) with other supernova (SN) samples, primarily at lower redshifts, to form a high-quality joint sample of 472 SNe (123 low-z, 93 SDSS, 242 SNLS, and 14 Hubble Space Telescope). SN data alone require cosmic acceleration at >99.999% confidence, including systematic effects. For the dark energy equation of state parameter (assumed constant out to at least z = 1.4) in a flat universe, we find w = −0.91+0.16−0.20(stat)+0.07−0.14(sys) from SNe only, consistent with a cosmological constant. Our fits include a correction for the recently discovered relationship between host-galaxy mass and SN absolute brightness. We pay particular attention to systematic uncertainties, characterizing them using a systematic covariance matrix that incorporates the redshift dependence of these effects, as well as the shape–luminosity and color–luminosity relationships. Unlike previous work, we include the effects of systematic terms on the empirical light-curve models. The total systematic uncertainty is dominated by calibration terms. We describe how the systematic uncertainties can be reduced with soon to be available improved nearby and intermediate-redshift samples, particularly those calibrated onto USNO/SDSS-like systems.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/6d872f2497d17925ce490b02c8418c831fdeb0fe

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Citations in the corpus

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H0LiCOW – I. H0 Lenses in COSMOGRAIL's wellspring: program overview (2016, background): “…to other non-local distance probes such as supernova (SN) that probe relative luminosity distances (e.g., Riess et al. 1998; Perlmutter et al. 1999; Conley et al. 2011; Suzuki et al. 2012; Betoule et al. 2014) and BAO (e.g., Eisenstein et al. 2005; Percival et al. 2010; Blake et al. 2011;…”
Type Ia Supernova Distances at Redshift >1.5 from the Hubble Space Telescope Multi-cycle Treasury Programs: The Early Expansion Rate (2017, background): “…(CfA, Hicken et al. 2009), the Carnegie Supernova Project (CSP, Stritzinger et al. 2011), the Sloan Digital Sky Survey (SDSS, Kessler et al. 2009), the Pan-STARRS1 Medium-Deep Survey (PS1, Rest et al. 2014), and the Canada-France-Hawaii Telescope Supernova Legacy Survey (SNLS, Conley et al. 2011).”
Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples (2014, methodology): “The rest of our sample is taken from the compilation assembled in Conley et al. (2011), hereafter referred to as the “C11 compilation”, comprising SNe from SNLS, HST and several nearby experiments.”
The Data Release of the Sloan Digital Sky Survey-II Supernova Survey (2014, neutral): “For example, in the SNLS3 cosmology analysis (Conley et al. 2011) measurements in the u band are de-weighted.”
THE SDSS-IV EXTENDED BARYON OSCILLATION SPECTROSCOPIC SURVEY: OVERVIEW AND EARLY DATA (2015, methodology): “They show that the combined Hubble Diagram (Betoule et al. 2014) of SNe Ia from the Supernova Legacy Survey (Conley et al. 2011) and SDSS-II Supernova Survey (Frieman et al. 2008; Sako et al. 2014) can be extrapolated to z = 0 when anchored at intermediate redshift by BAO measurements.”