Evidence For A Correlation Between The Si II Lambda 4000 Width And Type Ia Supernova Color
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Date
2011-06
Authors
Nordin, Jakob
Ostman, Linda
Goobar, Ariel
Balland, C.
Lampeitl, Hubert
Nichol, Robert C.
Sako, Masao
Schneider, Donald P.
Smith, Mathew
Sollerman, Jesper
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Abstract
We study the pseudo-equivalent width of the Si II lambda 4000 feature of Type Ia supernovae (SNe Ia) in the redshift range 0.0024 <= z <= 0.634. We find that this spectral indicator correlates with the light curve color excess (SALT2c) as well as previously defined spectroscopic subclasses (Branch types) and the evolution of the Si II lambda 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 lambda 4000 spectral indicator could provide important information to improve cosmological distance measurements with SNe Ia.
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Nordin, Jakob, Linda �stman, Ariel Goobar, C. Balland, Hubert Lampeitl, R. C. Nichol, M. Sako et al. "Evidence for a correlation between the Si II ?4000 width and type Ia supernova color." The Astrophysical Journal, Vol. 734, No. 1 (Jun., 2011): 42.