Supernova Classifications: Type Ib SN 2006dn and Type Ia SN 2006do
ATel #854; The Nearby Supernova Factory: P. Antilogus, S. Gilles, R. Pain, R. Pereira (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), N. Blanc, Y. Copin, E. Gangler, G. Smadja (Institut de Physique Nucleaire de Lyon), G. Aldering, C. Aragon, S. Bailey, S. Bongard, M. J. Childress, D. Kocevski, S. Loken, P. Nugent, S. Perlmutter, K. Runge, R. Scalzo, R. C. Thomas, L. Wang, B. A. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), E. Pecontal, G. Rigaudier (Centre de Recherche Astronomique de Lyon), R. Kessler (Kavli Institute for Cosmological Physics, Chicago, IL), C. Baltay, A. Bauer, D. Herrera, D. Rabinowitz (Yale)
on 8 Jul 2006; 21:11 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: R. C. Thomas (rcthomas@lbl.gov)
Subjects: Infra-Red, Optical, Ultra-Violet, Supernovae
The Nearby Supernova Factory reports the classification of two supernovae using spectra (range 320-1000 nm) obtained with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-meter telescope.
The spectrum (obtained July 08.5 UT) of SN 2006dn (CBET #571) in UGC 12188 reveals that it is of Type Ib, similar to that of SN 1990I 12 days after maximum (Elmhamdi et al. 2004, A&A, 429, 963). The spectrum shows strong contamination from an underlying H II region, the emission lines of which we use to constrain the host redshift to z = 0.017.
The spectrum (obtained July 08.6 UT) of SN 2006do (CBET #572) in ESO 470-G18 (z = 0.02843, Da Costa et al. 1991, ApJS, 75, 935 via NED) indicates that it is a normal Type Ia event 2-3 days before maximum, similar to SN 1994D or 1996X at that phase.
