Diversity of supernovae Ia determined using equivalent widths of Si II 4000

Details Diversity of supernovae Ia determined using equivalent widths of Si II 4000 Diversity of supernovae Ia determined using equivalent widths of Si II 4000

2008-09-18

arxiv.org/abs/0809.3133v2

A&A, 492, 535 (2008)

Astronomy and Astrophysics

Astrophysics

12 pages, 5 figures

Scientific paper

10.1051/0004-6361:200810675

Spectroscopic and photometric properties of low and high-z supernovae Ia (SNe Ia) have been analyzed in order to achieve a better understanding of their diversity and to identify possible SN Ia sub-types. We use wavelet transformed spectra in which one can easily measure spectral features. We investigate the \ion{Si}{II} 4000 equivalent width ($EW_w\lbrace\ion{Si}{II}\rbrace$). The ability and, especially, the ease in extending the method to SNe at high-$z$ is demonstrated. We applied the method to 110 SNe Ia and found correlations between $EW_w\lbrace\ion{Si}{II}\rbrace$ and parameters related to the light-curve shape for 88 supernovae with available photometry. No evidence for evolution of $EW_w\lbrace\ion{Si}{II}\rbrace$ with redshift is seen. Three sub-classes of SNe Ia were confirmed using an independent cluster analysis with only light-curve shape, colour, and $EW_w\lbrace\ion{Si}{II}\rbrace$. SNe from high-$z$ samples seem to follow a similar grouping to nearby objects. The $EW_w\lbrace\ion{Si}{II}\rbrace$ value measured on a single spectrum may point towards SN Ia sub-classification, avoiding the need for expansion velocity gradient calculations.

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