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High velocity features in the spectra of the Type Ia SN 1999ee: a property of the explosion or evidence of circumstellar interaction?
P. A. Mazzali, S. Benetti, M. Stehle +5
The near-maximum spectra of the Type Ia SN 1999ee are reviewed. Two narrow absorption features corresponding to the strongest component of the CaII IR triplet appear in the spectra…
Properties of Two Hypernovae Entering the Nebular Phase: SN 1997ef and SN 1997dq
P. A. Mazzali, J. Deng, K. Maeda +3
The two peculiar Type Ic supernovae (SNe) 1997ef and 1997dq are shown to have very similar photometric and spectral evolution in the epochs when both SNe are observed (i.e. beyond…
Signature of Electron Capture in Iron-Rich Ejecta of SN 2003du
Peter Hoeflich, Christopher L. Gerardy, Kenichi Nomoto +5
Late-time near-infrared and optical spectra are presented for the normal-bright SN2003du. At about 300 days after the explosion, the emission profiles of well isolated [FeII] lines…
Supernova light curve models for the bump in the Optical Counterpart of X-Ray Flash 030723
N. Tominaga, J. Deng, P. A. Mazzali +5
XRF 030723 is the first X-ray flash (XRF) to show in its optical light curve (LC) a bump that has been interpreted as the signature of a supernova (SN). After subtracting the after…