AAS 205th Meeting, 9-13 January 2005
Session 71 Supernovae
Poster, Tuesday, January 11, 2005, 9:20am-6:30pm, Exhibit Hall

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[71.05] Photometric Classification of Supernovae with Host Galaxy Color

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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© 2004. The American Astronomical Society.