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- W3129123053 abstract "Abstract Nova Cas 2020 was a second example of a classical nova forming both C 2 and CN molecules during its near-maximum phase. The formation C 2 and CN is indicative of the carbon-rich (C/O > 1) gas envelope of the nova. Our low-resolution spectroscopic observations in the optical from UT 2020 July 31 to August 19 revealed the appearance and the disappearance of the molecular absorption bands of C 2 and CN in Nova Cas 2020. These molecules were present during ∼3 days only. Based on analysis of the C 2 Swan band profiles, C 2 (and probably CN also) formed at ∼5000 K in the nova envelope (see ∼8000 K for typical novae at their visual brightness maxima). Spectral evolution and the formation conditions of the molecules are similar to those of V2676 Oph, which is the first example of a C 2 /CN-forming nova. We predict that a late-phase grain formation episode similar to that seen in V2676 Oph will occur in Nova Cas 2020." @default.
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- W3129123053 date "2021-02-01" @default.
- W3129123053 modified "2023-09-24" @default.
- W3129123053 title "Transient Formation of C2 and CN in the Near-maximum Phase of Nova Cas 2020(=V1391 Cas)" @default.
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- W3129123053 doi "https://doi.org/10.3847/1538-4357/abd02e" @default.
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