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C. L. Gerardy, G. H. Marion (University of Texas, Austin), R. A. Fesen (Dartmouth College), P. Höflich, J. C. Wheeler (University of Texas, Austin), K. Nomoto, K. Motohara (University of Tokyo)
Near-infrared (NIR) spectroscopy of several stripped-envelope core-collapse supernovae (SNe) are presented. NIR spectra of these objects are quite rich, exhibiting a large number of emission features. Particularly important are strong lines of He~I and C~I, which probe the outermost ejecta and constrain the pre-collapse mass-loss. Interestingly, the SN~1998bw-like broad-line Type~Ic SN~2002ap appears to exhibit much weaker C~I features than normal which may be an indication of extreme envelope stripping. NIR spectra also exhibit strong, relatively isolated lines of Mg~I, Si~I, Ca~II, and O~I which provide clues into the kinematics and mixing in the ejecta. Finally, late-time NIR spectra of two Type~Ic events: SN~2000ew and SN~2002ap show strongfirst-overtone carbon monoxide (CO) emission, providing the first evidence that molecule formation may be common in all core-collapse SNe.
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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.