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Evidence for a correlation between the Si II 4000 width and Type Ia supernova color
J. Nordin, L. Ostman, A. Goobar +8
We study the pseudo equivalent width of the Si II 4000 feature of Type Ia supernovae in the redshift range 0.0024 < z < 0.634. We find that this spectral indicator correlates with…
NTT and NOT spectroscopy of SDSS-II supernovae
L. Ostman, J. Nordin, A. Goobar +18
Context. The SDSS-II Supernova Survey, conducted between 2005 and 2007, was designed to detect a large number of Type Ia supernovae (SNe Ia) around z~0.2, the redshift "gap" betwee…
Statistical Classification Techniques for Photometric Supernova Typing
James Newling, Melvin Varughese, Bruce A. Bassett +8
Future photometric supernova surveys will produce vastly more candidates than can be followed up spectroscopically, highlighting the need for effective classification methods based…
A Mismatch in the Ultraviolet Spectra between Low-Redshift and Intermediate-Redshift Type Ia Supernovae as a Possible Systematic Uncertainty for Supernova Cosmology
Ryan J. Foley, Alexei V. Filippenko, Richard Kessler +11
We present Keck high-quality rest-frame ultraviolet (UV) through optical spectra of 21 Type Ia supernovae (SNe Ia) in the redshift range 0.11 < z < 0.37 and a mean redshift of 0.22…
Single or Double Degenerate Progenitors? Searching for Shock Emission in the SDSS-II Type Ia Supernovae
Brian T. Hayden, Peter M. Garnavich, Daniel Kasen +10
From the set of nearly 500 spectroscopically confirmed type~Ia supernovae and around 10,000 unconfirmed candidates from SDSS-II, we select a subset of 108 confirmed SNe Ia with wel…
Results from the Supernova Photometric Classification Challenge
Richard Kessler, Bruce Bassett, Pavel Belov +24
We report results from the Supernova Photometric Classification Challenge (SNPCC), a publicly released mix of simulated supernovae (SNe), with types (Ia, Ibc, and II) selected in p…