Classification of SNe 2005gn and 2005hb
ATel #635; The Nearby Supernova Factory: N. Blanc, S. Bongard, Y. Copin, E. Gangler, L. Sauge, G. Smadja (Institut de Physique Nucleaire de Lyon), P. Antilogus, S. Gilles, R. Pain, R. Pereira (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey, D. Kocevski, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, B. A. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), C. Bonnaud, E. Pecontal (Centre de Recherche Astronomique de Lyon), R. Kessler (Kavli Institute for Cosmological Physics, Chicago, IL), C. Baltay, D. Rabinowitz, A. Bauer (Yale)
on 18 Oct 2005; 23:20 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Brian C. Lee (BCLee@LBL.gov)
Subjects: Optical, Supernovae
The Nearby Supernova Factory reports that spectra (range 320-1000 nm) of supernovae 2005gn and 2005hb (IAUC # 8616 ), obtained October 18.6 UT with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-meter telescope, indicate that both supernovae are of Type II. SN2005gn is a Type IIn supernova at a redshift of z = 0.0397, with prominent H-alpha (FWHM 4000 km/s) and Ca II IR triplet emission. The redshift derived from the peak of the H-alpha feature is a match to that measured for the host, ESO 488-G030 (Andreuzzi et al. 1998 A&A 337, 17). SN2005hb is a Type II SN with spectroscopic features similar to those of the Type IIP supernova 1992H at 36 days after explosion (as reported by Clochiatti et al. 1996 AJ 111, 1286).
