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The origin of dust in the early Universe has been the subject of considerabledebate. Core-collapse supernovae (ccSNe), which occur several million yearsafter their massive progenitors form, could be a major source of that dust, asin the local universe several ccSNe have been observed to be copious dustproducers. Here we report nine near-infrared (0.8 - 2.5 micron) spectra of theType II-P SN 2017eaw in NGC 6946, spanning the time interval 22 - 205 daysafter discovery. The specta show the onset of CO formation and continuumemission at wavelengths greater than 2.1 micron from newly-formed hot dust, inaddition to numerous lines of hydrogen and metals, which reveal the change inionization as the density of much of the ejecta decreases. The observed COmasses estimated from an LTE model are typically 10^{-4} Msun during days 124 -205, but could be an order of magnitude larger if non-LTE conditions arepresent in the emitting region. The timing of the appearance of CO isremarkably consistent with chemically controlled dust models of Sarangi &Cherchneff.

Near-Infrared Spectroscopy of SN 2017eaw in 2017: Carbon Monoxide and Dust Formation in a Type II-P Supernova