The type IIb SN 2008ax: Spectral and light curve evolution
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 2 months after the explosion. In the same period He i lines become the most prominent spectral features. SN 2008...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Journal Article |
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Oxford University Press
2008
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| Online Access: | http://hdl.handle.net/20.500.11937/39180 |
| _version_ | 1848755521282113536 |
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| author | Pastorello, A. Kasliwal, M. Crockett, R. Valenti, S. Arbour, R. Itagaki, K. Kaspi, S. Gal-Yam, A. Smartt, S. Griffith, R. Maguire, K. Ofek, E. Seymour, Nick Stern, D. Wiethoff, W. |
| author_facet | Pastorello, A. Kasliwal, M. Crockett, R. Valenti, S. Arbour, R. Itagaki, K. Kaspi, S. Gal-Yam, A. Smartt, S. Griffith, R. Maguire, K. Ofek, E. Seymour, Nick Stern, D. Wiethoff, W. |
| author_sort | Pastorello, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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 2 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 d 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 Ha is observed at higher velocities in SN 2008ax than in SN 1993J. © 2008 RAS. |
| first_indexed | 2025-11-14T08:57:37Z |
| format | Journal Article |
| id | curtin-20.500.11937-39180 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:57:37Z |
| publishDate | 2008 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-391802017-09-13T14:25:25Z The type IIb SN 2008ax: Spectral and light curve evolution Pastorello, A. Kasliwal, M. Crockett, R. Valenti, S. Arbour, R. Itagaki, K. Kaspi, S. Gal-Yam, A. Smartt, S. Griffith, R. Maguire, K. Ofek, E. Seymour, Nick Stern, D. Wiethoff, W. 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 2 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 d 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 Ha is observed at higher velocities in SN 2008ax than in SN 1993J. © 2008 RAS. 2008 Journal Article http://hdl.handle.net/20.500.11937/39180 10.1111/j.1365-2966.2008.13618.x Oxford University Press unknown |
| spellingShingle | Pastorello, A. Kasliwal, M. Crockett, R. Valenti, S. Arbour, R. Itagaki, K. Kaspi, S. Gal-Yam, A. Smartt, S. Griffith, R. Maguire, K. Ofek, E. Seymour, Nick Stern, D. Wiethoff, W. The type IIb SN 2008ax: Spectral and light curve evolution |
| title | The type IIb SN 2008ax: Spectral and light curve evolution |
| title_full | The type IIb SN 2008ax: Spectral and light curve evolution |
| title_fullStr | The type IIb SN 2008ax: Spectral and light curve evolution |
| title_full_unstemmed | The type IIb SN 2008ax: Spectral and light curve evolution |
| title_short | The type IIb SN 2008ax: Spectral and light curve evolution |
| title_sort | type iib sn 2008ax: spectral and light curve evolution |
| url | http://hdl.handle.net/20.500.11937/39180 |