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Spectroscopic identification of SNe 2004ds and SN 2004dt

ATel #321; Avishay Gal-Yam (Caltech)
on 13 Aug 2004; 23:47 UT
Credential Certification: Avishay Gal-Yam (avishay@astro.caltech.edu)

Subjects: Optical, Supernovae

A. Gal-Yam, D. Fox and S. Kulkarni, California Institute of Technology, report on red spectra (range 550-780 nm) obtained by Kulkarni and Fox on Aug. 13.5 UT at the 10-m Keck I telescope (+ LRIS). The spectrum of of SN 2004ds (IAUC # 8386 ), shows a broad, well-developed P-Cyg H_alpha line and suggests that this is a type II supernova. The spectrum of SN 2004dt (IAUC # 8386 ), shows the distinctive Si II 6100 absorption trough around 6100 Angstrom, indicating this is a young SN Ia.