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Nearby Supernova Factory II reports detached High Velocity Si II in the Type Ia SN2012fr

ATel #4538; E. Hadjiyska, D. Rabinowitz, C. Baltay, N. Ellman, R. McKinnon, A. Effron (Yale) F. Cellier-Holzem, A. Canto, P. Antilogus, S. Bongard, R. Pain (LPNHE); Y. Copin, E. Gangler, R. Pereira, M. Rigault, G. Smadja (IPNL); G. Aldering, D. Birchall, M. Childress, H. Fakhouri, A. Kim, J. Nordin, P. Nugent, S. Perlmutter, K. Runge, C. Saunders, N. Suzuki, R. C. Thomas (LBNL); E. Pecontal (CRAL); C. Buton, U. Feindt, M. Kerschhaggl, M. Kowalski (U. Bonn); S. Benitez, W. Hillebrandt, M. Kromer, M. Sasdelli, A. Sternberg, S. Taubenberger (MPA); D. Baugh, J. Chen, N. Chotard, C. Wu (THCA) C. Tao (CPPM & THCA), D. Fouchez, A. Tilquin (CPPM);
on 4 Nov 2012; 00:00 UT
Credential Certification: Jakob Nordin (jnordin@lbl.gov)

Subjects: Optical, Supernovae

Spectra obtained Oct 31 and Nov 2 2012 (UTC) of SN2012fr (PSN J03333599-3607377, ATels #4523,4525,4535) show strong detached High Velocity Si II absorption features at 19000 km/s. The photospheric Si II component is found at 14000 km/s, making the Si II 6355 AA feature clearly "w"-shaped in the Nov 2 spectrum. We also detect possible C II 6580 AA absorption in both spectra, and High Velocity Ca II H&K and infrared triplet absorption at >20000 km/s. Observations were made by the Nearby Supernova Factory II (http://snfactory.lbl.gov) using our SuperNova Integral Field Spectrograph (Aldering et al 2002, SPIE, 4836, 61) on the University of Hawaii 2.2-meter telescope.