Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2803z&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #28.03; Bulletin of the American Astronomical Society, V
Other
Scientific paper
The SDSS-II Supernova Survey team have pursued extensive follow-up spectroscopy campaigns at a number of telescopes (especially HET, APO, Subaru, MDM, NTT, SALT, WHT and KECK). The observations to date (Fall 2005, 2006) have yielded spectra of several hundred SNe, focusing on type Ia's, but including classification spectra and synoptic monitoring of a variety of other supernova types, as well. The Ia data, in particular, allow us to explore the diversity of SN spectra and make connections with the SDSS-measured light curves. In our sample, dominated by supernovae at redshifts 0.1-0.35, most spectra have significant contamination from the host galaxy, making host subtraction a critical step for the SN identification and subsequent spectral analysis. In this update, we describe spectral results from 2005 and 2006, emphasizing our efforts to improve host galaxy subtraction with PCA methods and describing some spectral diversity in the SN Ia sample.
SDSS-II Supernova Collaboration
Zheng Chen
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