The Peculiar SN 2005hk: Do Some Type Ia Supernovae Explode as Deflagrations?1,статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We present extensive
u$^{'}$g$^{'}$r$^{'}$i$^{'}$BVRIYJHK$_{s}$
photometry and optical spectroscopy of the Type Ia supernova (SN)
2005hk. These data reveal that SN 2005hk was nearly identical in its
observed properties to SN 2002cx, which has been called ``the most
peculiar known Type Ia supernova.'' Both supernovae exhibited
high-ionization SN 1991T-like premaximum spectra, yet low peak
luminosities like that of SN 1991bg. The spectra reveal that SN 2005hk,
like SN 2002cx, exhibited expansion velocities that were roughly half
those of typical Type Ia supernovae. The R and I light curves of both
supernovae were also peculiar in not displaying the secondary maximum
observed for normal Type Ia supernovae. Our YJH photometry of SN 2005hk
reveals the same peculiarity in the near-infrared. By combining our
optical and near-infrared photometry of SN 2005hk with published
ultraviolet light curves obtained with the Swift satellite, we are able
to construct a bolometric light curve from \~{}15 days before to \~{}60 days
after B maximum. The shape and unusually low peak luminosity of this
light curve, plus the low expansion velocities and absence of a
secondary maximum at red and near-infrared wavelengths, are all in
reasonable agreement with model calculations of a three-dimensional
deflagration that produces \~{}0.2 M$_{solar}$ of $^{56}$Ni.