Carbon Monoxide in the Type Ic SN 2000ew

We present $K$-band (1.9–2.5$\,{\mu \rm {m}}$) spectra of the Type Ic SN 2000ew observed with IRCS on the Subaru Telescope. These data show the first detection of carbon monoxide (CO) emission in a Type Ic supernova. The detection of CO in SN 2000ew provides further evidence that molecule formation may be a common occurrence in core-collapse supernova ejecta. The spectrum also contains narrow emis...