2004IAUC.8410....2K

K. S. Kawabata, Hiroshima University; K. Maeda, J. Deng and K. Nomoto, University of Tokyo; P. A. Mazzali and E. Pian, Trieste Observatory; L. Wang, Lawrence Berkeley National Laboratory; and Y. Ohyama and M. Iye, National Astronomical Observatory of Japan, write on behalf of the Subaru supernova ToO group: "We obtained an optical spectrum (range 380-720 nm) of the peculiar type-Ic supernova 2003jd (IAUC 8232, 8234) on Sept. 12.4 UT with the Subaru 8.2-m telescope (+ FOCAS). The spectrum still shows an overall similarity to that of the hypernova 1998bw (at 201 days; Patat et al. 2001, Ap.J. 555, 900). However, the broad [O I] 630.0- and 636.3-nm emission feature seems to have a double-peaked profile with a separation of about 10 nm. This type of profile is typical of a disk-like or torus structure viewed near the equatorial plane. The broad emission line at 450-460 nm, possibly Mg I] 457.1 nm, barely shows a similar profile. The observed spectrum is contaminated by strong narrow emission lines and a blue continuum excess, which may be ascribed to an H II region in the host galaxy and/or a background star-forming galaxy."