Freedman

Supernovae
Wendy Freedman (Carnegie Observatories)

I will review the use of SNe Ia for luminosity distance determinations, and give an overview of recent measurements using SNe Ia to provide constraints on the acceleration of the universe. In addition, I will discuss the current systematic uncertainties for SNe Ia. I will also present recent results from the Carnegie Supernova Project. A primary goal of the CSP is to provide an i'- band restframe Hubble diagram for type Ia supernovae. The CSP uses the 1-m, 2.5-m and 6.5-m telescopes at Las Campanas, and is aimed at testing for and reducing systematic uncertainties by obtaining a sample of multiwavelength observations over the redshift range 0 < z < 0.7.