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The Remarkable Spin-down and Ultrafast Outflows of the Highly Pulsed Supersoft Source of Nova Herculis 2021

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dc.abstract.enNova Her 2021 (V1674 Her), which erupted on 2021 June 12, reached naked-eye brightness and has been detected from radio to γ-rays. An extremely fast optical decline of 2 magnitudes in 1.2 days and strong Ne lines imply a high-mass white dwarf. The optical pre-outburst detection of a 501.42 s oscillation suggests a magnetic white dwarf. This is the first time that an oscillation of this magnitude has been detected in a classical nova prior to outburst. We report X-ray outburst observations from Swift and Chandra that uniquely show (1) a very strong modulation of supersoft X-rays at a different period from reported optical periods, (2) strong pulse profile variations and the possible presence of period variations of the order of 0.1-0.3 s, and (3) rich grating spectra that vary with modulation phase and show P Cygni-type emission lines with two dominant blueshifted absorption components at ~3000 and 9000 km s<SUP>-1</SUP> indicating expansion velocities up to 11,000 km s<SUP>-1</SUP>. X-ray oscillations most likely arise from inhomogeneous photospheric emission related to the magnetic field. Period differences between reported pre- and post-outburst optical observations, if not due to other period drift mechanisms, suggest a large ejected mass for such a fast nova, in the range 2 × 10<SUP>-5</SUP>-2 × 10<SUP>-4</SUP> M <SUB>⊙</SUB>. A difference between the period found in the Chandra data and a reported contemporaneous post-outburst optical period, as well as the presence of period drifts, could be due to weakly nonrigid photospheric rotation.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorPage, Kim L.
dc.contributor.authorDrake, Jeremy J.
dc.contributor.authorNess, Jan-Uwe
dc.contributor.authorLuna, G. J. M.
dc.contributor.authorBeardmore, Andrew P.
dc.contributor.authorOrio, Marina
dc.contributor.authorOsborne, Julian P.
dc.contributor.authorStarrfield, Sumner
dc.contributor.authorBhargava, Y.
dc.contributor.authorBanerjee, Dipankar P. K.
dc.contributor.authorBalman, Solen
dc.contributor.authorSingh, K. P.
dc.contributor.authorDewangan, G. C.
dc.contributor.authorDarnley, M. J.
dc.contributor.authorMróz, Przemysław
dc.date.accessioned2024-01-26T10:37:15Z
dc.date.available2024-01-26T10:37:15Z
dc.date.copyright2021-10-26
dc.date.issued2021
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number2
dc.description.versionORIGINAL_AUTHOR
dc.description.volume922
dc.identifier.doi10.3847/2041-8213/AC34FD
dc.identifier.issn2041-8205
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/122976
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2021ApJ...922L..42D
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal Letters
dc.relation.pagesL42
dc.rightsOther
dc.sciencecloudnosend
dc.titleThe Remarkable Spin-down and Ultrafast Outflows of the Highly Pulsed Supersoft Source of Nova Herculis 2021
dc.typeJournalArticle
dspace.entity.typePublication