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The Type II-Plateau supernova (SN II-P) SN 2004dj was the first SN II-P forwhich spectropolarimetry data were obtained with fine temporal sampling before,during, and after the fall off of the photometric plateau -- the point thatmarks the transition from the photospheric to the nebular phase in SNe II-P.Unpolarized during the plateau, SN 2004dj showed a dramatic spike inpolarization during the descent off of the plateau, and then exhibited a smoothpolarization decline over the next two hundred days. This behavior wasinterpreted by Leonard et al. (2006) as evidence for a strongly non-sphericalexplosion mechanism that had imprinted asphericity only in the innermostejecta. In this brief report, we compare nine similarly well-sampled epochs ofspectropolarimetry of the Type II-P SN 2008bk to those of SN 2004dj. Incontrast to SN 2004dj, SN 2008bk became polarized well before the end of theplateau and also retained a nearly constant level of polarization through theearly nebular phase. Curiously, although the onset and persistence ofpolarization differ between the two objects, the detailed spectropolarimetriccharacteristics at the epochs of recorded maximum polarization for the twoobjects are extremely similar, feature by feature. We briefly interpret thedata in light of non-Local-Thermodynamic Equilibrium, time-dependentradiative-transfer simulations specifically crafted for SN II-P ejecta.

A Spectropolarimetric Comparison of the Type II-Plateau Supernovae SN 2008bk and SN 2004dj