Diversity of supernovae Ia determined using equivalent widths of Si II 4000
| dc.creator | Arsenijevic, V. | |
| dc.creator | Fabbro, S. | |
| dc.creator | Mourao, A. M. | |
| dc.creator | da Silva, A. J. Rica | |
| dc.date | 2008-09-18 | |
| dc.date | 2009-01-05 | |
| dc.date.accessioned | 2026-07-07T12:23:36Z | |
| dc.date.available | 2026-07-07T12:23:36Z | |
| dc.description | 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. | |
| dc.description | 12 pages, 5 figures | |
| dc.identifier | https://arxiv.org/abs/0809.3133 | |
| dc.identifier | http://arxiv.org/abs/0809.3133 | |
| dc.identifier | A&A, 492, 535 (2008) | |
| dc.identifier | doi:10.1051/0004-6361:200810675 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/214044 | |
| dc.subject | Astrophysics | |
| dc.title | Diversity of supernovae Ia determined using equivalent widths of Si II 4000 | |
| dc.type | text |