Improved Cosmological Constraints from New, Old, and Combined Supernova Data Sets

By M. Kowalski, David Rubin, G. Aldering, R. Agostinho, Alexis Amadon, R. Amanullah, C. Balland, K. Barbary, G. Blanc, P. Challis and 59 more. 2008

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We present a new compilation of Type Ia supernovae (SNe Ia), a new data set of low-redshift nearby-Hubble-flow SNe, and new analysis procedures to work with these heterogeneous compilations. This “Union” compilation of 414 SNe Ia, which reduces to 307 SNe after selection cuts, includes the recent large samples of SNe Ia from the Supernova Legacy Survey and ESSENCE Survey, the older data sets, as well as the recently extended data set of distant supernovae observed with the Hubble Space Telescope (HST). A single, consistent, and blind analysis procedure is used for all the various SN Ia subsamples, and a new procedure is implemented that consistently weights the heterogeneous data sets and rejects outliers. We present the latest results from this Union compilation and discuss the cosmological constraints from this new compilation and its combination with other cosmological measurements (CMB and BAO). The constraint we obtain from supernovae on the dark energy density is ΩΛ = 0.713+ 0.027−0.029(stat)+ 0.036−0.039(sys) , for a flat, ΛCDM universe. Assuming a constant equation of state parameter, w, the combined constraints from SNe, BAO, and CMB give w = − 0.969+ 0.059−0.063(stat)+ 0.063−0.066(sys) . While our results are consistent with a cosmological constant, we obtain only relatively weak constraints on a w that varies with redshift. In particular, the current SN data do not yet significantly constrain w at z > 1. With the addition of our new nearby Hubble-flow SNe Ia, these resulting cosmological constraints are currently the tightest available.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/980b7f716b27bc0f6ec3b0bda25afc829ebd95e5

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Citations in the corpus

Evidence of Environmental Dependencies of Type Ia Supernovae from the Nearby Supernova Factory indicated by Local H$\alpha$ (2013, methodology): “3 and 5 would shift the estimate of the dark energy equation of state by ∆w ≈ −0.06 (D. Rubin, private communication, as estimated using the Union machinery, Kowalski et al. 2008; Amanullah et al. 2010; Suzuki et al. 2012)”
FIRST-YEAR SLOAN DIGITAL SKY SURVEY-II (SDSS-II) SUPERNOVA RESULTS: CONSTRAINTS ON NONSTANDARD COSMOLOGICAL MODELS (2009, methodology): “While we acknowledge the way Kowalski et al. (2008) treat the SN data from their large Union08 compilation, we also note that adding a dispersion to the error mimics the use of more free parameters in the fit.”
IMPROVED DARK ENERGY CONSTRAINTS FROM ∼100 NEW CfA SUPERNOVA TYPE Ia LIGHT CURVES (2009, methodology): “The CfA3 sample is added to the Union set of Kowalski et al. (2008) to form the Constitution set and, combined with a BAO prior, produces 1 + w = 0.013+0.066 −0.068(0.11 syst), consistent with the cosmological constant.”
Cosmological parameter constraints from SDSS luminous red galaxies: a new treatment of large-scale clustering (2009, methodology): “When including systematic effects in the SN data as advocated by Kowalski et al. (2008), the CMB plus SN result changes to wDE = −0.900+0.078−0.078, a 50 per cent increase in the allowed region and a shift in the mean value of wDE of about 1σ .”
Cosmological Constraints from a Combination of Galaxy Clustering and Lensing -- III. Application to SDSS Data (2012, background): “…Sandage et al. 2006; van Leeuwen et al. 2007), high redshift supernovae Ia (e.g., Riess et al. 1998; Perlmutter et al. 1999, Astier et al. 2006; Kowalski et al. 2008), measurements of the primordial deuterium abundance (e.g., Burles, Nollett & Turner 2001; O’Meara et al. 2006), cluster…”
SEVEN-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP) OBSERVATIONS: COSMOLOGICAL INTERPRETATION (2010, methodology): “…clusters (Allen et al. 2008) to the WMAP 5-year data, the BAO measurement from Percival et al. (2007), and the “Union” Type Ia supernova samples from Kowalski et al. (2008) (all of 28 That the neutrino mass and w are anti-correlated implies that the neutrino mass limit would improve if we impose…”
GALAXY CLUSTERING IN THE COMPLETED SDSS REDSHIFT SURVEY: THE DEPENDENCE ON COLOR AND LUMINOSITY (2010, background): “…baryon density parameter Ωb = 0.045, consistent with recent determinations from the cosmic microwave background (WMAP5; Hinshaw et al. 2009; Dunkley et al. 2009; Komatsu et al. 2009), supernova Ia (Kowalski et al. 2008; Kessler et al. 2009), and baryon acoustic oscillations (Percival et al. 2010).”
DISSECTING THE GRAVITATIONAL LENS B1608+656. II. PRECISION MEASUREMENTS OF THE HUBBLE CONSTANT, SPATIAL CURVATURE, AND THE DARK ENERGY EQUATION OF STATE (2009, methodology): “Recently, Komatsu et al. (2009) measured w = −0.992+0.061 −0.062 by combining WMAP 5-year results (WMAP5) with observations of SNe Ia (Kowalski et al. 2008) and BAO (Percival et al. 2007).”
Approaches to understanding cosmic acceleration (2009, methodology): “In [122] the datasets used included the measurements of the CMB temperature and polarization power spectrum from the WMAP 5-year data release [39, 123], the ‘union’ set of supernovae compiled by the Supernovae Cosmology Project [37], the matter power spectrum of Luminous Red Galaxies (LRG) as measur”
THE CARNEGIE SUPERNOVA PROJECT: ANALYSIS OF THE FIRST SAMPLE OF LOW-REDSHIFT TYPE-Ia SUPERNOVAE (2009, result): “These results are relevant to the study of high-redshift SNe Ia for which red (and therefore faint) objects (with (Bmax − V max) > 0.4 mag) are rarely observed (e.g., Kowalski et al. 2008).”
A REDETERMINATION OF THE HUBBLE CONSTANT WITH THE HUBBLE SPACE TELESCOPE FROM A DIFFERENTIAL DISTANCE LADDER (2009, background): “Kowalski et al. 2008), 9http://lambda.gsfc.nasa.gov/ . independent measurements are a route to progress.”
CfA3: 185 TYPE Ia SUPERNOVA LIGHT CURVES FROM THE CfA (2009, methodology): “The application of the CfA3 data set to studying dark energy is presented in Hicken et al. (2009, hereafter H09), where 90 of the 185 objects presented here pass the quality cuts (on such things as redshift and phase of first observation) of Kowalski et al. (2008).”