Type Determination for SN 2005cc

ATel #502; The Nearby Supernova Factory: P. Antilogus, G. Garavini, S. Gilles, R. Pain (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, B. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), C. Bonnaud, E. Pecontal (Centre de Recherche Astronomique de Lyon), N. Blanc, S. Bongard, Y. Copin, E. Gangler, L. Sauge, G. Smadja (Institut de Physique Nucleaire de Lyon), R. Kessler (Kavli Institute for Cosmological Physics, Chicago, IL), C. Baltay, D. Rabinowitz, A. Bauer (Yale)
on 27 May 2005; 18:05 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Gabriele Garavini (garavini@in2p3.fr)

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The Nearby Supernova Factory reports on three spectra (range 340-1000 nm) of SN 2005cc in NGC 5383 (CBET #154) obtained May 21.4 UT, May 24.4 UT and May 26.4 UT with the SuperNova Integral Field Spectrograph on the University of Hawaii 2.2-m telescope. The first spectrum shows a red continuum with very weak narrow absorption features unlike any other known supernova spectrum. The spectrum obtained May 24.4 UT shows overall increased flux and deeper narrow absorption features similarly to that of SN 2002cx at -4 ( Li et al. 2003, PASP, 115, 453, and Branch et al. 2004, PASP, 116, 903) . The third spectrum obtained May 26.4 UT confirmed the similarity to SN2002cx prior to maximum light, making possible to approximately date the first observation at around one week before maximum. On the May 26.4 UT spectrum absorption features of FeIII 440.4 nm and FeIII 512.9 nm are visible, CaII H&K and SiII 635.5 nm appear weaker than in SN2002cx at -4. Assuming the NED recession velocity for the host galaxy of 2270 km/s, SiII 635.5 nm appears at 5900 km/s, and a weak H-alpha absorption feature may be present with a velocity of 4000 km/s. Na I D lines at the velocity of the host suggests that there might be some extinction along the line of sight.