AAS 201st Meeting, January, 2003
Session 56. Supernovae Potpourri
Poster, Tuesday, January 7, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[56.03] Near-Infrared Spectroscopy of Stripped-Envelope Supernovae

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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© 2002. The American Astronomical Soceity.