Spectral Indicators in Type Ia Supernovae and a Possible Link with Reddening

Details Spectral Indicators in Type Ia Supernovae and a Possible Link with Reddening Spectral Indicators in Type Ia Supernovae and a Possible Link with Reddening

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743427n&link_type=abstract

American Astronomical Society, AAS Meeting #217, #434.27; Bulletin of the American Astronomical Society, Vol. 43, 2011

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We study spectra of Type Ia supernovae (SNe Ia), observed at the NTT and NOT telescopes and obtained in conjunction with the SDSS-II Supernova Survey. This sample is compared with local and SNLS spectra.
We explore possible correlations between spectral indicators (pseudo Equivalent Widths and line velocities) and lightcurve parameters, host galaxy properties and redshift.
This analysis is extended to a detailed study of the Si4000 feature, a region showing strong correlations with lightcurve color, spectroscopic (Branch) subtypes and velocity gradient. These results provide further evidence that SNe Ia previously considered as "normal" are intrinsically different, and that the observed reddening of SNe Ia cannot be solely caused by dimming by interstellar dust in the host galaxy. We discuss implications for distance estimates and constraints on cosmological parameters.

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