تقرير
The nebular spectrum of the type Ia supernova 2003hv: evidence for a non-standard event
| العنوان: | The nebular spectrum of the type Ia supernova 2003hv: evidence for a non-standard event |
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| المؤلفون: | Mazzali, Paolo A., Maurer, I., Stritzinger, M., Taubenberger, S., Benetti, S., Hachinger, S. |
| سنة النشر: | 2011 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | The optical and near-infrared late-time spectrum of the under-luminous Type Ia supernova 2003hv is analysed with a code that computes nebular emission from a supernova nebula. Synthetic spectra based on the classical explosion model W7 are unable to reproduce the large \FeIII/\FeII\ ratio and the low infrared flux at $\sim 1$ year after explosion, although the optical spectrum of SN\,2003hv is reproduced reasonably well for a supernova of luminosity intermediate between normal and subluminous (SN\,1991bg-like) ones. A possible solution is that the inner layers of the supernova ejecta ($v \lsim 8000$\,\kms) contain less mass than predicted by classical explosion models like W7. If this inner region contains $\sim 0.5 \Msun$ of material, as opposed to $\sim 0.9 \Msun$ in Chandrasekhar-mass models developed within the Single Degenerate scenario, the low density inhibits recombination, favouring the large \FeIII/\FeII\ ratio observed in the optical, and decreases the flux in the \FeII\ lines which dominate the IR spectrum. The most likely scenario may be an explosion of a sub-Chandrasekhar mass white dwarf. Alternatively, the violent/dynamical merger of two white dwarfs with combined mass exceeding the Chandrasekhar limit also shows a reduced inner density. Comment: MNRAS, in press |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1111/j.1365-2966.2011.19000.x |
| URL الوصول: | http://arxiv.org/abs/1105.1298 |
| رقم الأكسشن: | edsarx.1105.1298 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1111/j.1365-2966.2011.19000.x |
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