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 |
| Language: | English |
| Published: |
2008
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| _version_ | 1826281349386862592 |
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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, N 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, N Stern, D Wiethoff, W |
| author_sort | Pastorello, A |
| collection | OXFORD |
| 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 Hα is observed at higher velocities in SN 2008ax than in SN 1993J. © 2008 RAS. |
| first_indexed | 2024-03-07T00:27:28Z |
| format | Journal article |
| id | oxford-uuid:7e9fc55b-7357-41ab-a0be-809b265c644b |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:27:28Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | oxford-uuid:7e9fc55b-7357-41ab-a0be-809b265c644b2022-03-26T21:11:18ZThe type IIb SN 2008ax: Spectral and light curve evolutionJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7e9fc55b-7357-41ab-a0be-809b265c644bEnglishSymplectic Elements at Oxford2008Pastorello, AKasliwal, MCrockett, RValenti, SArbour, RItagaki, KKaspi, SGal-Yam, ASmartt, SGriffith, RMaguire, KOfek, ESeymour, NStern, DWiethoff, WWe 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 Hα is observed at higher velocities in SN 2008ax than in SN 1993J. © 2008 RAS. |
| 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, N 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 |
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