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Fang, J. Maund, J. M. Silverman, J. P. Anderson, J. R. Mould, J. Spyromilio, K. I. Clubb, K. Maguire, L. Le Guillou, L. Pei, M. Bessell, M. B. Pracy, M. J. Childress, M. Owers, M. Phillips, M. Stritzinger, M. Sullivan, N. Morrell, N. Scott, N. S. Loaring, O. D. Fox, P. A. Mazzali, P. L. Kelly, R. A. Scalzo, S. A. Sim, S. B. Cenko, S. Benetti, S. Keller, S. Ozbilgen, S. Smartt, S. Valenti, S. W. Jha, T. D. Desjardins, T. de Jaeger, T. Pickering","submitted_at":"2013-02-12T21:07:05Z","abstract_excerpt":"We present 65 optical spectra of the Type Ia supernova SN 2012fr, of which 33 were obtained before maximum light. At early times SN 2012fr shows clear evidence of a high-velocity feature (HVF) in the Si II 6355 line which can be cleanly decoupled from the lower velocity \"photospheric\" component. This Si II 6355 HVF fades by phase -5; subsequently, the photospheric component exhibits a very narrow velocity width and remains at a nearly constant velocity of v~12,000 km/s until at least 5 weeks after maximum brightness. 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