Evans, A, Rho, J, Geballe, TR, Banerjee, DPK, Dessart, L and Joshi, V (2018) Near-Infrared Spectroscopy of SN 2017eaw in 2017: Carbon Monoxide and Dust Formation in a Type II-P Supernova. Astrophysical Journal Letters, 864 (1). ISSN 2041-8205

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Abstract

The origin of dust in the early Universe has been the subject of considerable debate. Core-collapse supernovae (ccSNe), which occur several million years after their massive progenitors form, could be a major source of that dust, as in the local universe several ccSNe have been observed to be copious dust producers. Here we report nine near-infrared (0.8 − 2.5 μm) spectra of the Type II-P SN 2017eaw in NGC 6946, spanning the time interval 22 − 205 days after discovery. The specta show the onset of CO formation and continuum emission at wavelengths greater than 2.1 μm from newly-formed hot dust, in addition to numerous lines of hydrogen and metals, which reveal the change in ionization as the density of much of the ejecta decreases. The observed CO masses 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 are present in the emitting region. The timing of the appearance of CO is remarkably consistent with chemically controlled dust models of Sarangi & Cherchneff.

Item Type: Article
Additional Information: The final published version of this article is available online at http://doi.org/10.3847/2041-8213/aad77f.
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 02 Aug 2018 10:47
Last Modified: 17 Sep 2018 15:13
URI: http://eprints.keele.ac.uk/id/eprint/5191

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