Jeffrey M. Silverman, Ryan J. Foley, Alexei V. Filippenko, Mohan Ganeshalingam, Aaron J. Barth, Ryan Chornock, Christopher V. Griffith, Jason J. Kong, Nicholas Lee, Douglas C. Leonard, Thomas Matheson, Emily G. Miller, Thea N. Steele, Brian J. Barris, Joshua S. Bloom, Bethany E. Cobb, Alison L. Coil, Louis-Benoit Desroches, Elinor L. Gates, Luis C. Ho, Saurabh W. Jha, Michael T. Kandrashoff, Weidong Li, Kaisey S. Mandel, Maryam Modjaz, Matthew R. Moore, Robin E. Mostardi, Marina S. Papenkova, Sung Park, Daniel A. Perley, Dovi Poznanski, Cassie A. Reuter, James Scala, Franklin J. D. Serduke, Joseph C. Shields, Brandon J. Swift, John L. Tonry, Schuyler D. Van Dyk, Xiaofeng Wang, Diane S. Wong
In this first paper in a series we present 1298 low-redshift (z < 0.2)
optical spectra of 582 Type Ia supernovae (SNe Ia) observed from 1989 through
2008 as part of the Berkeley SN Ia Program (BSNIP). 584 spectra of 199 SNe Ia
have well-calibrated light curves with measured distance moduli, and many of
the spectra have been corrected for host-galaxy contamination. Most of the data
were obtained using the Kast double spectrograph mounted on the Shane 3 m
telescope at Lick Observatory and have a typical wavelength range of
3300-10,400 Ang., roughly twice as wide as spectra from most previously
published datasets. We present our observing and reduction procedures, and we
describe the resulting SN Database (SNDB), which will be an online, public,
searchable database containing all of our fully reduced spectra and companion
photometry. In addition, we discuss our spectral classification scheme (using
the SuperNova IDentification code, SNID; Blondin & Tonry 2007), utilizing our
newly constructed set of SNID spectral templates. These templates allow us to
accurately classify our entire dataset, and by doing so we are able to
reclassify a handful of objects as bona fide SNe Ia and a few other objects as
members of some of the peculiar SN Ia subtypes. In fact, our dataset includes
spectra of nearly 90 spectroscopically peculiar SNe Ia. We also present
spectroscopic host-galaxy redshifts of some SNe Ia where these values were
previously unknown. The sheer size of the BSNIP dataset and the consistency of
our observation and reduction methods makes this sample unique among all other
published SN Ia datasets and is complementary in many ways to the large,
low-redshift SN Ia spectra presented by Matheson et al. 2008 and Blondin et al.
(in preparation).
View original:
http://arxiv.org/abs/1202.2128
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