Near-infrared studies of nova V5584 Sgr in the pre-maximum and early decline phase

TL;DR

This study presents near-infrared spectroscopic and photometric observations of nova V5584 Sgr during its early phases, revealing spectral evolution, carbon lines characteristic of FeII class, CO emission, and a dust formation phase.

Contribution

It provides detailed near-infrared spectral evolution and evidence of dust formation in nova V5584 Sgr, which was not previously documented.

Findings

Spectral evolution from P Cygni to emission lines

Detection of carbon lines matching FeII class

Observation of CO emission bands and dust formation phase

Abstract

We present near-infrared spectroscopic and photometric observations of nova V5584 Sgr taken during the first 12 days following its discovery on Oct. 26.439 UT 2009. The evolution of the spectra is shown from the initial P Cygni phase to an emission line phase. The prominent carbon lines seen in the JHK spectra closely match those observed in a FeII class nova outburst. The spectra show first-overtone CO bands in emission between 2.29-2.40 micron. By examining WISE and other publicly available data, we show that the nova underwent a pronounced dust formation phase during February - April 2010.