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R. G. Carlberg, A. Conley, D. A. Howell (University of Toronto), J. D. Neill (University of Victoria), K. Perrett (University of Toronto), C. J. Pritchet (University of Victoria), M. Sullivan (University of Toronto)
The first 71 confirmed Ia supernovae from the Supernova Legacy Survey being conducted with CFHT imaging and Gemini, VLT and Keck spectroscopy set limits on variable dark energy cosmological models. For a generalized Chaplygin gas, in which the dark energy content is (1-\OmegaM)/\rhoa, we find that a is statistically consistent with zero, with a best fit a=-0.2±0.3 (68 systematic errors requires a further refinement of the photometric calibration and the potential model biases. A variable dark energy equation of state with w=w0+w1 z shows the expected degeneracy between increasingly positive w0 and negative w1. The existing data rule out the parameters of the Weller & Linder (2002) Super-gravity inspired model cosmology (w0,w1)=(-0.81,0.31). The full 700 Ia of the completed survey will provide a statistical error limit of w1 of about 0.2 and significant constraints on variable w models.
The Canadian NSERC provided funding for the scientific analysis. These results are based on observations obtained at the CFHT, Gemini, VLT and Keck observatories.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.