Improved photometric calibration of the SNLS and the SDSS supernova surveys

Betoule, M.; Marriner, J.; Regnault, Nicolas; Cuillandre, Jean-Charles; Astier, P.; Guy, J.; Balland, C.; Hage, P. El; Hardin, D.; Kessler, R.; Guillou, L. Le; Mosher, J.; Pain, R.; Rocci, P. F.; Šako, M.; Schahmanèche, K.

doi:10.1051/0004-6361/201220610

Cited by 191 publications

(324 citation statements)

References 41 publications

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“…While the SNLS3 sample contain 472 supernovae whose parameters were determined using a combination of the SALT2 and SiFTO lightcurve fitters, 740 supernovae are present in the final JLA sample, measured using SALT2 only. The impact of the new calibration and change in the light-curve fitter shifted the best fit Ω 0 m value for a flat ΛCDM model from 0.228 ± 0.038 to 0.295 ± 0.034 (1.8σ drift, see Betoule et al 2013 andSect. 6.4 of Betoule et al 2014, for more details).…”

Section: Updated Sn Ia Samplementioning

confidence: 99%

First experimental constraints on the disformally coupled Galileon model

Neveu

Ruhlmann-Kleider

Astier

et al. 2014

A&A

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Aims. The Galileon model is a modified gravity model that can explain the late-time accelerated expansion of the Universe. In a previous work, we derived experimental constraints on the Galileon model with no explicit coupling to matter and showed that this model agrees with the most recent cosmological data. In the context of braneworld constructions or massive gravity, the Galileon model exhibits a disformal coupling to matter, which we study in this paper. Methods. After comparing our constraints on the uncoupled model with recent studies, we extend the analysis framework to the disformally coupled Galileon model and derive the first experimental constraints on that coupling, using precise measurements of cosmological distances and the growth rate of cosmic structures. Results. In the uncoupled case, with updated data, we still observe a low tension between the constraints set by growth data and those from distances. In the disformally coupled Galileon model, we obtain better agreement with data and favour a non-zero disformal coupling to matter at the 2.5σ level. This gives an interesting hint of the possible braneworld origin of Galileon theory.

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Section: Updated Sn Ia Samplementioning

confidence: 99%

First experimental constraints on the disformally coupled Galileon model

Neveu

Ruhlmann-Kleider

Astier

et al. 2014

A&A

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“…5.3 and subsequent sections. [5] In a recent paper, Betoule et al (2013) present results from an extensive programme that improves the photometric calibrations of the SDSS and SNLS supernovae surveys. An analysis of the SDSS-II and SNLS supernovae samples, including revisions to the photometric calibrations, favours a higher value of Ω m = 0.295 ± 0.034 for the base ΛCDM model, consistent with the Planck results discussed in Sect.…”

Section: Introductionmentioning

confidence: 99%

Planck2013 results. XVI. Cosmological parameters

Ade¹,

Aghanim²,

Armitage-Caplan³

et al. 2014

A&A

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163

2,253

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This paper presents the first cosmological results based on Planck measurements of the cosmic microwave background (CMB) temperature and lensing-potential power spectra. We find that the Planck spectra at high multipoles ( > ∼ 40) are extremely well described by the standard spatiallyflat six-parameter ΛCDM cosmology with a power-law spectrum of adiabatic scalar perturbations. Within the context of this cosmology, the Planck data determine the cosmological parameters to high precision: the angular size of the sound horizon at recombination, the physical densities of baryons and cold dark matter, and the scalar spectral index are estimated to be θ * = (1.04147 ± 0.00062) × 10 −2 , Ω b h 2 = 0.02205 ± 0.00028, Ω c h 2 = 0.1199 ± 0.0027, and n s = 0.9603 ± 0.0073, respectively (note that in this abstract we quote 68% errors on measured parameters and 95% upper limits on other parameters). For this cosmology, we find a low value of the Hubble constant, H 0 = (67.3 ± 1.2) km s −1 Mpc −1 , and a high value of the matter density parameter, Ω m = 0.315 ± 0.017. These values are in tension with recent direct measurements of H 0 and the magnituderedshift relation for Type Ia supernovae, but are in excellent agreement with geometrical constraints from baryon acoustic oscillation (BAO) surveys. Including curvature, we find that the Universe is consistent with spatial flatness to percent level precision using Planck CMB data alone. We use high-resolution CMB data together with Planck to provide greater control on extragalactic foreground components in an investigation of extensions to the six-parameter ΛCDM model. We present selected results from a large grid of cosmological models, using a range of additional astrophysical data sets in addition to Planck and high-resolution CMB data. None of these models are favoured over the standard six-parameter ΛCDM cosmology. The deviation of the scalar spectral index from unity is insensitive to the addition of tensor modes and to changes in the matter content of the Universe. We find an upper limit of r 0.002 < 0.11 on the tensor-to-scalar ratio. There is no evidence for additional neutrino-like relativistic particles beyond the three families of neutrinos in the standard model. Using BAO and CMB data, we find N eff = 3.30 ± 0.27 for the effective number of relativistic degrees of freedom, and an upper limit of 0.23 eV for the sum of neutrino masses. Our results are in excellent agreement with big bang nucleosynthesis and the standard value of N eff = 3.046. We find no evidence for dynamical dark energy; using BAO and CMB data, the dark energy equation of state parameter is constrained to be w = −1.13 +0.13 −0.10 . We also use the Planck data to set limits on a possible variation of the fine-structure constant, dark matter annihilation and primordial magnetic fields. Despite the success of the six-parameter ΛCDM model in describing the Planck data at high multipoles, we note that this cosmology does not provide a good fit to the temperature power spectrum at low multipoles. T...

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“…In recent years, Marra et al (2013) and Quartin et al (2014) have developed the technique further using their "MeMo" likelihood methodology to estimate the non-Gaussian behavior of the SN magnitude residuals due to weak lensing magnification. In Castro & Quartin (2014), they applied this technique to the JLA SN sample of Betoule et al (2014), obtaining new constraints on σ8 (the amplitude of density fluctuations in the Universe). Amendola et al (2015) extended this technique to alternative cosmological scenarios, by including γ (a measure of the growth of structure in the Universe) as a free parameter.…”

Section: Introductionmentioning

confidence: 99%

Measuring weak lensing correlations of Type Ia supernovae

Scovacricchi

Nichol

Macaulay

et al. 2016

Mon. Not. R. Astron. Soc.

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We study the feasibility of detecting weak lensing spatial correlations between Supernova (SN) Type Ia magnitudes with present (Dark Energy Survey, DES) and future (Large Synoptic Survey Telescope, LSST) surveys. We investigate the angular auto-correlation function of SN magnitudes (once the background cosmology has been subtracted) and cross-correlation with galaxy catalogues. We examine both analytical and numerical predictions, the latter using simulated galaxy catalogues from the MICE Grand Challenge Simulation. We predict that we will be unable to detect the SN auto-correlation in DES, while it should be detectable with the LSST SN deep fields (15,000 SNe on 70 deg 2 ) at ≃ 6σ level of confidence (assuming 0.15 magnitudes of intrinsic dispersion). The SN-galaxy cross-correlation function will deliver much higher signal-to-noise, being detectable in both surveys with an integrated signalto-noise of ∼ 100 (up to 30 arcmin separations). We predict joint constraints on the matter density parameter (Ω m ) and the clustering amplitude (σ 8 ) by fitting the auto-correlation function of our mock LSST deep fields. When assuming a Gaussian prior for Ω m , we can achieve a 25% measurement of σ 8 from just these LSST supernovae (assuming 0.15 magnitudes of intrinsic dispersion). These constraints will improve significantly if the intrinsic dispersion of SNe Ia can be reduced.

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Improved photometric calibration of the SNLS and the SDSS supernova surveys

Cited by 191 publications

References 41 publications

First experimental constraints on the disformally coupled Galileon model

First experimental constraints on the disformally coupled Galileon model

Planck2013 results. XVI. Cosmological parameters

Measuring weak lensing correlations of Type Ia supernovae

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