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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 &gt; 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.

Transient Formation of C2 and CN in the Near-maximum Phase of Nova Cas 2020(=V1391 Cas)

Transient Formation of C₂ and CN in the Near-maximum Phase of Nova Cas 2020(=V1391 Cas)