تقرير
The type IIb SN 2008ax: spectral and light curve evolution
| العنوان: | The type IIb SN 2008ax: spectral and light curve evolution |
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| المؤلفون: | Pastorello, A., Kasliwal, M. M., Crockett, R. M., Valenti, S., Arbour, R., Itagaki, K., Kaspi, S., Gal-Yam, A., Smartt, S. J., Griffith, R., Maguire, K., Ofek, E. O., Seymour, N., Stern, D., Wiethoff, W. |
| سنة النشر: | 2008 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics |
| الوصف: | We present spectroscopy and photometry of the He-rich supernova (SN) 2008ax. The early-time spectra show prominent P-Cygni H lines, which decrease with time and disappear completely about two months after the explosion. In the same period He I lines become the most prominent spectral features. SN 2008ax displays the ordinary spectral evolution of a type IIb supernova. A stringent pre-discovery limit constrains the time of the shock breakout of SN 2008ax to within only a few hours. Its light curve, which peaks in the B band about 20 days after the explosion, strongly resembles that of other He-rich core-collapse supernovae. The observed evolution of SN 2008ax is consistent with the explosion of a young Wolf-Rayet (of WNL type) star, which had retained a thin, low-mass shell of its original H envelope. The overall characteristics of SN 2008ax are reminiscent of those of SN 1993J, except for a likely smaller H mass. This may account for the findings that the progenitor of SN 2008ax was a WNL star and not a K supergiant as in the case of SN 1993J, that a prominent early-time peak is missing in the light curve of SN 2008ax, and that Halpha is observed at higher velocities in SN 2008ax than in SN 1993J. Comment: 10 pages, including 8 figures and 4 tables. Accepted for publication in MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1111/j.1365-2966.2008.13618.x |
| URL الوصول: | http://arxiv.org/abs/0805.1914 |
| رقم الأكسشن: | edsarx.0805.1914 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1111/j.1365-2966.2008.13618.x |
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