2003IAUC.8161....3K

K. S. Kawabata, Y. Ohyama, and the FOCAS team, National Astronomical Observatory of Japan; K. Nomoto, University of Tokyo; P. Mazzali, Trieste Observatory; and L. Wang, Lawrence Berkeley National Laboratory, write: "We obtained optical spectropolarimetry (range 380-1020 nm) of SN 2002ic (cf. IAUC 8028, 8151, 8157) with the Subaru 8.2-m telescope (+ FOCAS) on June 27.6 UT. SN 2002ic is still bright (R about 19) and still shows a strong H_alpha emission line (FWHM about 6 nm) and a weaker H_beta emission line (H_alpha/Hbeta flux ratio about 16). A broad and strong Ca II triplet emission is also seen. The spectrum has an apparent similarity to that of the peculiar type-IIn supernova 1997cy between about 100 and 250 days after the explosion (Turatto et al. 2000, Ap.J. 534, L57), and this is consistent with the metamorphosis observed in the earlier phase (IAUC 8151). The depolarization across the H_alpha emission is distinct, which indicates that SN 2002ic has a considerable intrinsic polarization (p > 1 percent) at some wavelength regions. The spectrum of SN 2002ic is dominated by the interaction region and appears similar to a type-IIn supernova spectrum."