Breaking the Degeneracy in Magnetic Cataclysmic Variable X-Ray Spectral Modeling Using X-Ray Light Curves

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dc.contributor.authorBelloni, Diogo
dc.contributor.authorRodrigues, Claudia Vilega
dc.contributor.authorSchreiber, Matthias R.
dc.contributor.authorCastro, Manuel
dc.contributor.authorCosta, Joaquim Eduardo Rezende
dc.contributor.authorHayashi, Takayuki
dc.contributor.authorLima, Isabel de Jesus
dc.contributor.authorLuna, Gerardo Juan Manuel
dc.contributor.authorMartins, Murilo
dc.contributor.authorOliveira, Alexandre Soares de
dc.contributor.authorParsons, Steven G.
dc.contributor.authorSilva, Karleyne Medeiros Gomes da
dc.contributor.authorStecchini, Paulo Eduardo
dc.contributor.authorStuchi, Teresa de Jesus
dc.contributor.authorZorotovic, Monica
dc.date.accessioned2025-04-04T14:12:11Z
dc.date.available2025-04-04T14:12:11Z
dc.date.issued22021
dc.description.abstractWe present an analysis of mock X-ray spectra and light curves of magnetic cataclysmic variables using an upgraded version of the 3D cyclops code. This 3D representation of the accretion flow allows us to properly model total and partial occultation of the postshock region by the white dwarf as well as the modulation of the X-ray light curves due to the phase-dependent extinction of the preshock region. We carried out detailed postshock region modeling in a four-dimensional parameter space by varying the white dwarf mass and magnetic field strength as well as the magnetosphere radius and the specific accretion rate. To calculate the postshock region temperature and density profiles, we assumed equipartition between ions and electrons; took into account the white dwarf gravitational potential, the finite size of the magnetosphere, and a dipole-like magnetic field geometry; and considered cooling by both bremsstrahlung and cyclotron radiative processes. By investigating the impact of the parameters on the resulting X-ray continuum spectra, we show that there is an inevitable degeneracy in the four-dimensional parameter space investigated here, which compromises X-ray continuum spectral fitting strategies and can lead to incorrect parameter estimates. However, the inclusion of X-ray light curves in different energy ranges can break this degeneracy, and it therefore remains, in principle, possible to use X-ray data to derive fundamental parameters of magnetic cataclysmic variables, which represents an essential step toward understanding their formation and evolution.
dc.description.physical34 p.
dc.format.mimetypePDF
dc.identifier.affiliationInstituto Nacional de Pesquisas Espaciais
dc.identifier.affiliationUniversidad Técnica Federico Santa María
dc.identifier.affiliationUniversity of Maryland
dc.identifier.affiliationUniversidad de Buenos Aires
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.affiliationUniversity of Sheffield
dc.identifier.affiliationEuropean Southern Observatory
dc.identifier.affiliationUniversidade Federal do Rio de Janeiro
dc.identifier.affiliationUniversidad de Valparaíso
dc.identifier.bibliographicCitationBELLONI, Diogo et al. Breaking the Degeneracy in Magnetic Cataclysmic Variable X-Ray Spectral Modeling Using X-Ray Light Curves. The Astrophysical Journal, v. 256, n. 2, p. 1-34, 2021. Disponível em:
dc.identifier.doi10.3847/1538-4365/ac141c
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/800
dc.language.isoen_US
dc.publisherIOP science
dc.rights.holderThe Astrophysical Journal
dc.subject.keywordCataclysmic variable stars
dc.subject.keywordMagnetic variable stars
dc.titleBreaking the Degeneracy in Magnetic Cataclysmic Variable X-Ray Spectral Modeling Using X-Ray Light Curves
dc.typeArtigos de Periódicos

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