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Garnavich, P. Milne, P. Wyatt, R. Chornock, R. J. Foley, R. Kessler, S. E. Persson, S. Frank, S. Gonzalez, S. I. Blinnikov, S. Jha, W. Krzeminski, W. L. Freedman, W. Li","submitted_at":"2006-11-09T18:52:12Z","abstract_excerpt":"We present extensive u'g'r'i'BVRIYJHKs photometry and optical spectroscopy of 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 pre-maximum spectra, yet low peak luminosities like SN 1991bg. The spectra reveal that SN 2005hk, like SN 2002cx, exhibited expansion velocities that were roughly half those of typical type Ia supernovae. 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