2009

Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves

Hicken, Malcolm, Wood-Vasey, W. Michael, Blondin, Stephane et al.

Understand

We combine the CfA3 supernova Type Ia (SN Ia) sample with samples from the literature to calculate improved constraints on the dark energy equation of state parameter, w.

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.
The CfA3 addition makes the cosmologically-useful sample of nearby SN Ia between 2.6 and 2.9 times larger than before, reducing the statistical uncertainty to the point where systematics play the largest role.

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