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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…
Spectral properties of Type Ia supernovae up to z~0.3
J. Nordin, L. Ostman, A. Goobar +10
Aims: Spectroscopic observations of Type Ia supernovae obtained at the New Technology Telescope (NTT) and the Nordic Optical Telescope (NOT), in conjunction with the SDSS-II Supern…
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…
The Effect of Host Galaxies on Type Ia Supernovae in the SDSS-II Supernova Survey
Hubert Lampeitl, Mathew Smith, Robert C. Nichol +18
We present an analysis of the host galaxy dependencies of Type Ia Supernovae (SNe Ia) from the full three year sample of the SDSS-II Supernova Survey. We rediscover, to high signif…
A Measurement of the Rate of Type Ia Supernovae in Galaxy Clusters from the SDSS-II Supernova Survey
Benjamin Dilday, Bruce Bassett, Andrew Becker +32
ABRIDGED We present measurements of the Type Ia supernova (SN) rate in galaxy clusters based on data from the Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey. The cluster SN…
Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
R. Amanullah, C. Lidman, D. Rubin +42
We report on work to increase the number of well-measured Type Ia supernovae (SNe Ia) at high redshifts. Light curves, including high signal-to-noise HST data, and spectra of six S…
Measurements of the Rate of Type Ia Supernovae at Redshift z < ~0.3 from the SDSS-II Supernova Survey
Benjamin Dilday, Mathew Smith, Bruce Bassett +33
We present a measurement of the volumetric Type Ia supernova (SN Ia) rate based on data from the Sloan Digital Sky Survey II (SDSS-II) Supernova Survey. The adopted sample of super…