Persistent nuclear burning in Nova Sgr 2016 N.4 (= V5856 Sgr = ASASSN-16ma) six years past its outburst
arXiv:2208.09630 · doi:10.1051/0004-6361/202244498
Abstract
We report on the fast Nova Sgr 2016 N.4 being surprisingly trapped in a long-lasting and bright plateau (Delta I >= 10 mag above quiescence) six years past the nova eruption. Very few other novae experience a similar occurrence. We carried out an intensive observing campaign collecting daily BVRI photometry and monthly high-resolution optical spectroscopy, and observed the nova in ultraviolet and X-rays with Swift satellite at five distinct epochs. The bolometric luminosity radiated during the plateau is ~4200 Lsun (scaled to the distance of the Galactic Bulge), corresponding to stable nuclear burning on a 0.6 Msun white dwarf. A stable wind is blown off at FWZI~1600 km/s, with episodic reinforcement of a faster FWZI~3400 km/s mass loss, probably oriented along the polar directions. The collision of these winds could power the emission detected in X-rays. The burning shell has an outer radius of ~25 Rsun at which the effective temperature is ~7600 K, values similar to those of a F0 II/Ib bright giant. The Delta m < 1 mag variability displayed during the plateau is best described as chaotic, with the irregular appearance of quasi-periodic oscillations with a periodicity of 15-17 days. A limited amount of dust (~3x10^(-11) Msun) continuously condenses at T(dust)~1200 K in the outflowing wind, radiating L(dust)~52 Lsun.
arXiv commentAccepted for publication in A&A
References in corpus (31)
- Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
- Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
- Correcting for the Effects of Interstellar Extinction
- The Swift X-ray Telescope
- The Swift Ultra-Violet/Optical Telescope
- The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
- Cosmic-Ray Rejection by Laplacian Edge Detection
- A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
- The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
- Photometric Calibration of the Swift Ultraviolet/Optical Telescope
- Preliminary Results from NEOWISE: An Enhancement to the Wide-field Infrared Survey Explorer for Solar System Science
- Initial Performance of the NEOWISE Reactivation Mission
- UBVRI Photometric Standard Stars Around the Celestial Equator: Updates and Additions
- CHIRON - A Fiber Fed Spectrometer for Precise Radial Velocities
- Thermal Stability of White Dwarfs Accreting Hydrogen-rich Matter and Progenitors of Type Ia Supernovae
- Catalog of 93 Nova Light Curves: Classification and Properties
- Hydrogen Burning on Accreting White Dwarfs: Stability, Recurrent Novae, and the Post-Novae Supersoft Source
- Three-dimensional interstellar dust reddening maps of the Galactic plane
- Thermally Stable Nuclear Burning on Accreting White Dwarfs
- Symbiotic stars in X-rays
- A Nova Outburst Powered by Shocks
- The Cepheid period -- luminosity -- metallicity relation based on Gaia DR2 data
- Radiative shocks create environments for dust formation in novae
- Properties, evolution and morpho-kinematical modelling of the very fast nova V2672 Oph (Nova Oph 2009), a clone of U Sco
- Surveying the X-ray Behavior of Novae as They Emit -rays
- The 2021 outburst of the recurrent nova RS Ophiuchi observed in X-rays by the Neil Gehrels Swift Observatory: a comparative study
- Classical Novae at Radio Wavelengths
- Photometric evolution of seven recent novae and the double component characterizing the lightcurve of those emitting in gamma rays
- Photometric evolution, orbital modulation and progenitor of Nova Mon 2012
- Very Long Baseline Interferometry imaging of the advancing ejecta in the first gamma-ray nova V407 Cyg
- Evidence for Gamma-Ray Pulsations from the Classical Nova ASASSN-16ma