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K. Shella (Wesleyan University), A. Crotts (Columbia University)
One of the greatest barriers in supernovae cosmology is quickly and correctly identifying type Ia. We explore a photometric method for identifying and separating type Ia from other supernovae. The method adopts color-color diagrams but introduces a single host galaxy color, B-V, to standardize the supernovae colors. The addition of host B-V to supernovae B-V and V-R produces separation of type Ia from type Ib, Ic, and II. We compare the performance of this method to others using synthetic photometry for a sample of 11 supernovae with combined UV and optical spectra and a second sample of optical only spectra from 26 supernovae. The analysis compares Johnson-Cousins, Sloan filters, and filters developed in conjunction with the Large Zenith Telescope (LZT) project. For most color-color combinations and filters, the introduction of host B-V improves separation. The combination of B-V, V-R, and host galaxy B-V with the LZT filters appears to create a distinct Ia parameter space for z = 0, 0.25, 0.50, 0.75, 1.0.
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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.