A Spectrophotometric analysis and dust properties of classical nova V5584 Sgr

TL;DR

This study presents optical and infrared observations of nova V5584 Sgr, analyzing its spectral evolution, dust formation, physical properties, and chemical abundances using spectrophotometry and modeling.

Contribution

It provides detailed spectroscopic analysis, dust property estimation, and chemical abundance measurements of V5584 Sgr, enhancing understanding of nova ejecta and dust formation processes.

Findings

Nova classified as moderately fast with t2 ~26 days.

Dust formation confirmed with temperature and mass estimates.

Ejecta shows significant enrichment in heavy elements.

Abstract

In this work, optical observations of the nova V5584 Sgr are presented. These observations cover different phases including pre-maximum, early decline, and nebular. The spectra are dominated by hydrogen Balmer, Fe II, and O I lines with P-Cygni profiles in the early phase, which are subsequently observed in complete emission. The presence of numerous Fe II lines and low ejecta velocity aligns with the Fe II type nova classification. From optical and NIR colors it is clear that this nova manifests dust formation in the ejecta. The dust temperature and mass were estimated from a spectral energy distribution (SED) fit to the JHK band magnitudes and the WISE data. Light curve analysis shows t$_2$ and t$_3$ values of $\sim$ 26 and $\sim$ 48 days, classifying the nova as moderately fast. The physical and chemical properties during early decline and later phases were evaluated using the photoionization code CLOUDY. The best-fit model parameters from two epochs of multiwavelength spectra are compatible with a hot white dwarf source with a roughly constant luminosity of $\sim$ (2.08 $\pm$ 0.10) $\times$ 10$^{36}$ erg s$^{-1}$. We find an ejected mass of $\sim$ (1.59 $\pm$ 0.04) $\times$ 10$^{-4}$M$_{\odot}$. Abundance analysis indicates that the ejecta is significantly enriched relative to solar values, with O/H = 30.2, C/H = 10.8, He/H = 1.8, Mg/H = 1.68, Na/H = 1.55, and N/H = 45.5 in the early decline phase, and O/H = 4.5, Ne/H = 1.5, and N/H = 24.5 in the nebular phase.