Do spectra improve distance measurements of Type Ia supernovae

@article{Blondin2010DoSI,
  title={Do spectra improve distance measurements of Type Ia supernovae},
  author={St{\'e}phane Blondin and Kaisey S. Mandel and Robert P. Kirshner},
  journal={Astronomy and Astrophysics},
  year={2010},
  volume={526}
}
We investigate the use of a wide variety of spectroscopic measurements to determine distances to low-redshift Type Ia supernovae (SN Ia) in the Hubble flow observed through the CfA Supernova P rogram. We consider linear models for predicting distances to SN Ia using light-curve width and color parameters (determined using the SALT2 light-curve fitter) and a spectroscopic ind icator, and evaluate the resulting Hubble diagram scatter using a cross-validation procedure. We confirm the ability of… 

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TLDR
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MEASURING EJECTA VELOCITY IMPROVES TYPE Ia SUPERNOVA DISTANCES

We use a sample of 121 spectroscopically normal Type Ia supernovae (SNe Ia) to show that their intrinsic color is correlated with their ejecta velocity, as measured from the blueshift of the Si ii
...