A. V. Filippenko, J. M. Silverman, and R. J. Foley, University of California, Berkeley, report that inspection of a CCD spectrum (range 310- 900 nm), obtained on Nov. 11 UT with the Keck I 10-m telescope (+ LRIS), shows that 2007pk is a peculiar type-IIn supernova, shortly after explosion. Its spectrum strongly resembles early-time spectra of SN 1998S (Leonard et al. 2000, Ap.J. 536, 239); besides the narrow Balmer emission lines (which are somewhat narrower and weaker than those of 1998S), there is strong, narrow He II 468.6-nm emission and a weaker C III/N III 460-nm blend. The very blue continuum is well fitted by an unreddened 24000-K blackbody spectrum.
Central Bureau Electronic Telegrams
- Pub Date:
- November 2007