Near-Infrared Spectroscopy of Stripped-Envelope Supernovae

Details Near-Infrared Spectroscopy of Stripped-Envelope Supernovae Near-Infrared Spectroscopy of Stripped-Envelope Supernovae

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.5603g&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #56.03; Bulletin of the American Astronomical Society, Vol. 34, p.1204

Astronomy and Astrophysics

Astronomy

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Scientific paper

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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