Evidence for a correlation between the Si II 4000 width and Type Ia supernova color

Details Evidence for a correlation between the Si II 4000 width and Type Ia supernova color Evidence for a correlation between the Si II 4000 width and Type Ia supernova color

2010-12-20

arxiv.org/abs/1012.4430v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages, 8 figures, 2 tables. Minor changes to match version accepted by the Astrophysical Journal

Scientific paper

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 the lightcurve color excess (SALT2 c) as well as previously defined spectroscopic subclasses (Branch types) and the evolution of the Si II 6150 velocity, i.e., the so called velocity gradient. Based on our study of 55 objects from different surveys, we find indications that the Si II 4000 spectral indicator could provide important information to improve cosmological distance measurements with Type Ia supernovae.

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