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    The type IIb SN 2008ax: Spectral and light curve evolution

    Access Status
    Open access via publisher
    Authors
    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.
    Date
    2008
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Pastorello, A. and Kasliwal, M. and Crockett, R. and Valenti, S. and Arbour, R. and Itagaki, K. and Kaspi, S. et al. 2008. The type IIb SN 2008ax: Spectral and light curve evolution. Monthly Notices of the Royal Astronomical Society. 389 (2): pp. 955-966.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1111/j.1365-2966.2008.13618.x
    ISSN
    0035-8711
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/39180
    Collection
    • Curtin Research Publications
    Abstract

    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.

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