Spectral diversity of Type Ia Supernovae

Details Spectral diversity of Type Ia Supernovae Spectral diversity of Type Ia Supernovae

2006-05-05

arxiv.org/abs/astro-ph/0605147v1

Mon.Not.Roy.Astron.Soc.370:933-940,2006

Astronomy and Astrophysics

Astrophysics

8 pages, 8 figures, uses mn2e.cls, accepted for publication by MNRAS

Scientific paper

10.1111/j.1365-2966.2006.10508.x

We use published spectroscopic and photometric data for 8 Type Ia supernovae to construct a dispersion spectrum for this class of object, showing their diversity over the wavelength range 3700A to 7100A. We find that the B and V bands are the spectral regions with the least dispersion, while the U band below 4100A is more diverse. Some spectral features such as the Si line at 6150A are also highly diverse. We then construct two objective measures of 'peculiarity' by (i) using the deviation of individual objects from the average SN Ia spectrum compared to the typical dispersion and (ii) applying principle component analysis. We demonstrate these methods on several SNe Ia that have previously been classified as peculiar.

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