Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey

Details Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey

2011-04-07

arxiv.org/abs/1104.1443v1

ApJS (2011), 192, 1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Published in ApJS. Data available from https://tspace.library.utoronto.ca/snls/

Scientific paper

10.1088/0067-0049/192/1/1

We combine high redshift Type Ia supernovae from the first 3 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 {\it Hubble Space Telescope}). SN data alone require cosmic acceleration at >99.9% 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 $w = -0.91^{+0.16}_{-0.20}(\mathrm{stat}) ^{+0.07}_{-0.14} (\mathrm{sys})$ 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 systematics 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.

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