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astro-ph.SR2026
A Quantitative Method to Investigate the Spectral Class Time Evolution of Novae
Maria Kopsacheili, Martín Guerrero, Diego Alejandro Vasquez Torres
Novae are spectroscopically classified as Fe II or He/N according to the dominance of Fe II, or He and N emission lines in their pre-nebular spectra, while spectra exhibiting both…
astro-ph.HE2026
The type Ia supernova 2023vjh: a peculiar 1991bg-like SN with unusually faint light curves
M. Kopsacheili, L. Galbany, G. Folatelli +32
We present observations of the 1991bg-like type Ia supernova (SN) 2023vjh, associated with the elliptical galaxy MCG+04-10-013. Its light-curve shape parameters ($Δm_{15}(B)=1.89 \…