Author: V. Stanishev (Stockholm University) and the European Supernova
We present an extensive set of optical observations of the peculiar Type Ia SN 2005hk during the first three months after the explosion. We show that the evolution of SN 2005hk closely follows that of the peculiar SN 2002cx. SN 2005hk is more luminous than SN 2002cx, while still under-luminous compared to normal Type Ia supernovae. The spectrum at 9 days before maximum is dominated by conspicuous Fe III and Ni III lines, and the Si II 6355 line is also clearly visible. The near-maximum spectra show lines of Si II, S II, Fe II, Fe III, as well as other intermediate mass and iron group elements. The velocities of the lines in all these spectra are rather low (~6000 km/s). We also present near-infrared spectra of SN 2005hk around maximum light and late-time optical and near-infrared photometry.
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