Persistent nuclear burning in Nova Sgr 2016 N.4 (=V5856 Sgr = ASASSN-16ma) six years past its outburst

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dc.contributor.authorMunari, U.
dc.contributor.authorMasetti, N.
dc.contributor.authorWalter, F.M.
dc.contributor.authorWilliams, R.E.
dc.contributor.authorHambsch, F.-J.
dc.contributor.authorFrigo, A.
dc.contributor.authorValisa, P.
dc.date.accessioned2024-04-08T22:45:34Z
dc.date.available2024-04-08T22:45:34Z
dc.date.issued2022-11-01
dc.descriptionIndexación: Scopus.
dc.description.abstractWe report on the fast Nova Sgr 2016 N.4 being surprisingly trapped in a long-lasting and bright plateau (ΔI≥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 at five distinct epochs. The bolometric luminosity radiated during the plateau is ∼4200 L⊗ (scaled to the distance of the Galactic Bulge), corresponding to stable nuclear burning on a 0.6 M⊗ white dwarf. A stable wind is blown off at full width at zero intensity (FWZI) ∼ 1600 km s-1, with episodic reinforcement of a faster FWZI ∼ 3400 km s-1 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 R⊗ at which the effective temperature is ∼7600 K, values similar to those of a F0 II/Ib bright giant. The Δm < 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 (≈3 × 10-11 M⊗) continuously condenses at Tdust ∼ 1200 K in the outflowing wind, radiating Ldust ∼ 52 L⊗. © U. Munari et al. 2022.
dc.description.urihttps://www.aanda.org/articles/aa/full_html/2022/11/aa44498-22/aa44498-22.html
dc.identifier.citationAstronomy and Astrophysics, Volume 667, 1 November 2022, Article number A7
dc.identifier.doi10.1051/0004-6361/202244498
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/55779
dc.language.isoen
dc.publisherEDP Sciences
dc.rights.licenseCC BY 4.0 DEED Attribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectCataclysmic variables
dc.subjectNovae
dc.subjectOutflows
dc.subjectStars: winds
dc.subjectBolometric luminosities
dc.subjectGalactic bulge
dc.subjectHigh resolution
dc.subjectLong lasting
dc.subjectNova
dc.subjectNuclear burning
dc.subjectOptical spectroscopy
dc.subjectStars: winds
dc.subjectWhite dwarfs
dc.titlePersistent nuclear burning in Nova Sgr 2016 N.4 (=V5856 Sgr = ASASSN-16ma) six years past its outburst
dc.typeArtículo
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