The Dusty Aftermath of a Rapid Nova: V5579 Sgr
A. Raj, M. S. Bisht, F. M. Walter, R. Pandey, C. E. Woodward, D. E., Harker, D. Bisht, H. P. Singh, A. Agarwal, J. C. Pandey, A. Joshi, K. Belwal,, and Christian Buil

TL;DR
This paper presents comprehensive optical and infrared observations of the fast nova V5579 Sgr, revealing dust formation, spectral evolution, and ejecta composition, contributing valuable data on nova behavior and dust production.
Contribution
It provides detailed multi-epoch spectroscopic and photometric analysis of V5579 Sgr, including dust formation, spectral line evolution, and abundance measurements, which are novel for this nova.
Findings
Nova classified as fast with t2 ≈ 9 days.
Detected dust formation 20 days post-outburst.
Ejecta shows significant elemental enhancement.
Abstract
V5579 Sgr was a fast nova discovered in 2008 April 18.784 UT. We present the optical spectroscopic observations of the nova observed from the Castanet Tolosan, SMARTS and CTIO observatories spanning over 2008 April 23 to 2015 May 11. The spectra are dominated by hydrogen Balmer, Fe II and O I lines with P-Cygni profiles in the early phase, typical of an Fe II class nova. The spectra show He I and He II lines along with forbidden lines from N, Ar, S, and O in the nebular phase. The nova showed a pronounced dust formation episode that began about 20 days after the outburst. The dust temperature and mass were estimated using the WISE data from spectral energy distribution (SED) fits. The PAH-like features are also seen in the nova ejecta in the mid-IR Gemini spectra taken 522 d after the discovery. Analysis of the light curve indicates values of t and t about 9 and 13 days,…
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Taxonomy
TopicsGamma-ray bursts and supernovae · Solar and Space Plasma Dynamics
