@Article{BelloniRSCCHLLMOPSSSZ:2021:BrDeMa,
author = "Belloni, Diogo Teixeira and Rodrigues, Claudia Vilega and
Schreiber, Matthias R. and Castro Avila, Manuel Antonio and Costa,
Joaquim Eduardo Rezende and Hayashi, Takayuki and Lima, Isabel de
Jesus and Luna, Gerardo J. M. and Martins, Murilo and Oliveira,
Alexandre S. and Parsons, Steven G. and Silva, Karleyne M. G. and
Stecchini, Paulo Eduardo Freire and Stuchi, Teresa J. and
Zorotovic, Monica",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidad
T{\'e}cnica Federico Santa Mar{\'{\i}}a} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {NASA Goddard Space Flight Center}
and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidad de Buenos Aires} and {Universidade do Vale do
Para{\'{\i}}ba (UNIVAP)} and {Universidade do Vale do
Para{\'{\i}}ba (UNIVAP)} and {University of Sheffield} and
{Gemini Observatory} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Universidade Federal do Rio de Janeiro
(UFRJ)} and {Universidad de Valpara{\'{\i}}so}",
title = "Breaking the Degeneracy in Magnetic Cataclysmic Variable X-Ray
Spectral Modeling Using X-Ray Light Curves",
journal = "Astrophysical Journal Supplement Series",
year = "2021",
volume = "256",
number = "2",
month = "OCT",
abstract = "We 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.",
doi = "10.3847/1538-4365/ac141c",
url = "http://dx.doi.org/10.3847/1538-4365/ac141c",
issn = "0067-0049 and 1538-4365",
label = "20211025",
language = "en",
targetfile = "belloni-Breaking.pdf",
urlaccessdate = "15 jun. 2024"
}