JWST NIRSpec+MIRI Observations of the nearby Type IIP supernova 2022acko
arxiv(2024)
摘要
We present JWST spectral and photometric observations of the Type IIP
supernova (SN) 2022acko at 50 days past explosion. These data are the first
JWST spectral observations of a core-collapse SN. We identify 30 different H I
features, other features associated with products produced from the CNO cycle,
and s-process elements such as Sc II and Ba II. By combining the JWST spectra
with ground-based optical and NIR spectra, we construct a full Spectral Energy
Distribution from 0.4 to 25 microns and find that the JWST spectra are fully
consistent with the simultaneous JWST photometry. The data lack signatures of
CO formation and we estimate a limit on the CO mass of < 10^-8 solar mass. We
demonstrate how the CO fundamental band limits can be used to probe underlying
physics during stellar evolution, explosion, and the environment. The
observations indicate little mixing between the H envelope and C/O core in the
ejecta and show no evidence of dust. The data presented here set a critical
baseline for future JWST observations, where possible molecular and dust
formation may be seen.
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