IAU Circ., 8611, 2 (2005/October-0)
Supernovae 2005ds, 2005em, 2005er, 2005es, 2005et, 2005eu.
MORRELL N., FOLATELLI G., PHILLIPS M.M. (The Carnegie Supernova Project)
Abstract (from CDS):
N. Morrell, G. Folatelli, and M. M. Phillips, on behalf of the Carnegie Supernova Project, report spectroscopic observations (range 380-920 nm) of SN 2005er (cf. IAUC 8608), SN 2005es (cf. IAUC 8608), SN 2005et (cf. IAUC 8610), and SN 2005em (cf. IAUC 8604) obtained on Oct. 5.13, 5.18, 5.27, and 5.35 UT, respectively, with the Las Campanas 2.5-m du Pont telescope (+ WFCCD spectrograph). SN 2005em is probably a type-IIb supernova a few days after maximum light, the spectrogram showing some resemblance to those of SN 1987K. SN 2005er is a peculiar type-Ia supernova, similar to SN 1991bg, probably a few days after maximum light. Strong Ti II absorptions are observed. Assuming the NED recession velocity of 7847 km/s for the host galaxy (from Wegner et al. 1999, MNRAS 305, 259), an expansion velocity of 9600 km/s is derived from the absorption minimum of the Si II 635.5-nm doublet. SN 2005es is a young type-II supernova showing a rather featureless, blue continuum in the somewhat-noisy spectrogram. H_alpha and H_beta are seen with P-Cyg profiles. Assuming the NED recession velocity of 11287 km/s for the host galaxy (from Huchra et al. 1999, Ap.J. Suppl. 121, 287), an expansion velocity of 9600 km/s is derived from the absorption minimum of H_beta. SN 2005et is a type-Ia supernova about one week after maximum light. The spectrogram is similar to that of SN 1989B at eight days after maximum; an expansion velocity of 10000 km/s is derived from the minimum of the Si II 635.5-nm line, adopting the NED recession velocity of 10371 km/s for the host galaxy (from Wegner et al., op.cit.).
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