SNLS3: Constraints on Dark Energy Combining the Supernova Legacy Survey Three Year Data with Other Probes

Abstract

We present observational constraints on the nature of dark energy using the Supernova Legacy Survey three year sample (SNLS3) of Guy et al. (2010) and Conley et al. (2011). We use the 472 SNe Ia in this sample, accounting for recently discovered correlations between SN Ia luminosity and host galaxy properties, and include the effects of all identified systematic uncertainties directly in the cosmological fits. Combining the SNLS3 data with the full WMAP7 power spectrum, the Sloan Digital Sky Survey luminous red galaxy power spectrum, and a prior on the Hubble constant H0 from SHOES, in a flat universe we find omega_m=0.269+/-0.015 and w=-1.061+0.069-0.068 -- a 6.5% measure of the dark energy equation-of-state parameter w. The statistical and systematic uncertainties are approximately equal, with the systematic uncertainties dominated by the photometric calibration of the SN Ia fluxes -- without these calibration effects, systematics contribute only a ~2% error in w. When relaxing the assumption of flatness, we find omega_m=0.271+/-0.015, omega_k=-0.002+/-0.006, and w=-1.069+0.091-0.092. Parameterizing the time evolution of w as w(a)=w_0+w_a(1-a), gives w_0=-0.905+/-0.196, w_a=-0.984+1.094-1.097 in a flat universe. All of our results are consistent with a flat, w=-1 universe. The size of the SNLS3 sample allows various tests to be performed with the SNe segregated according to their light curve and host galaxy properties. We find that the cosmological constraints derived from these different sub-samples are consistent. There is evidence that the coefficient, beta, relating SN Ia luminosity and color, varies with host parameters at >4sigma significance (in addition to the known SN luminosity--host relation); however this has only a small effect on the cosmological results and is currently a sub-dominant systematic.

arXiv commentAccepted for publication in ApJ. Data available from https://tspace.library.utoronto.ca/snls

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• Exploring Alternative Cosmologies with the LSST: Simulated Forecasts and Current Observational Constraints
• Stress testing the dark energy equation of state imprint on supernova data
• Bootstrapping from inflationary magnetogenesis to CMB initial conditions
• Implications for cosmology from Ground-based Cosmic Microwave Background observations
• Facilities for Dark Energy Investigations
• Specific Effect of Peculiar Velocities on Dark-Energy Constraints from Type Ia Supernovae
• Can the apparent expansion of the Universe be attributed to an increasing vacuum refractive index ?
• Type Ia supernovae with and without blueshifted narrow Na I D lines - how different is their structure?
• Maximum Cosmological Information from Type-Ia Supernova Observations
• K2: Background Survey -- the search for undiscovered transients in Kepler/K2 data
• Photometric type Ia supernova surveys in narrow band filters
• Spectroradiometry with Space Telescopes
• Investigating the Possibility of a Turning Point in the Dark Energy Equation of State
• A proposal to improve the accuracy of cosmological observables and address the Hubble tension problem
• Anti-Anthropic Solutions to the Cosmic Coincidence Problem
• Stellar Populations in type Ia supernova host galaxies at intermediate-high redshift: Star formation and metallicity enrichment histories
• Constraining dark energy using observational growth rate data
• Biases from Non-Simultaneous Regression with Correlated Covariates: A Case Study from Supernova Cosmology
• Cosmological Study in Myrzakulov $F(R,T)$ Quasi-dilaton Massive Gravity
• Comparing the light curves of simulated Type Ia Supernovae with observations using data-driven models
• Compact and extended objects from self-interacting phantom fields
• On rates of supernovae strongly lensed by galactic haloes in Millennium Simulation
• Linear dark energy equation of state revealed by supernovae?
• A cosmology-independent calibration of type Ia supernovae data
• Linear growth of structure in projected massive gravity
• Spectroscopic identification of a redshift 1.55 supernova host galaxy from the Subaru Deep Field Supernova Survey
• Reconstructing the Cosmic Expansion History with a Monotonicity Prior
• An Exploration of Heterogeneity in Supernova Type Ia Samples
• Effect of lensing magnification on type Ia supernova cosmology
• Intrinsic color diversity of nearby type Ia supernovae
• New Constraints on Anisotropic Expansion from Supernovae Type Ia
• Classical, quantum, and phenomenological aspects of dark energy models
• A topological extension of GR: Black holes induce dark energy
• The snapshot distance method: estimating the distance to a Type Ia supernova from minimal observations
• Modified scaling in $k$-essence model in interacting dark energy - dark matter scenario
• Confronting Einstein Yang Mills Higgs Dark Energy in light of observations
• Long-wavelength gravitational waves and cosmic acceleration
• Artificial Neural Network Spectral Light Curve Template for Type Ia Supernovae and its Cosmological Constraints
• Irreversible Thermodynamics of the Universe: Constraints from Planck Data
• Galaxy clustering in modified gravity from full-physics simulations. I: two-point correlation functions
• Addressing type Ia supernova color variability with a linear spectral template
• Observations of General Relativity at strong and weak limits
• The influence of environmental effects on Type Ia Supernovae Standardization
• Dynamical analysis of $k$-essence cosmology in the light of Supernova Ia observations
• A Topological Extension of General Relativity to Explore the Nature of Quantum Space-time, Dark Energy and Inflation
• Dynamics of quasi de Sitter and linear combination of exponential models in extended gravity
• Testing the effects from dark radiation
• Type Ia supernova Hubble diagrams with host galaxy photometric redshifts
• Propagation of gravitational waves in a universe with slowly-changing equation of state
• Hot subdwarfs from the surviving companions of the white dwarf + main-sequence channel of Type Ia supernovae