Three-dimensional heat transfer effects in external layers of a magnetized neutron star. (arXiv:2007.11035v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Kondratyev_I/0/1/0/all/0/1">Ilya A. Kondratyev</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Moiseenko_S/0/1/0/all/0/1">Sergey G. Moiseenko</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bisnovatyi_Kogan_G/0/1/0/all/0/1">Gennady S. Bisnovatyi-Kogan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Glushikhina_M/0/1/0/all/0/1">Maria V. Glushikhina</a>
Determination of a magnetic field structure on a neutron star (NS) surface is
an important problem of a modern astrophysics. In a presence of strong magnetic
fields a thermal conductivity of a degenerate matter is anisotropic. In this
paper we present 3D anisotropic heat transfer simulations in outer layers of
magnetized NSs, and construct synthetic thermal light curves. We have used a
different from previous works tensorial thermal conductivity coefficient of
electrons, derived from the analytical solution of the Boltzmann equation by
the Chapman-Enskog method. We have obtained a NS surface temperature
distribution in presence of dipole-plus-quadrupole magnetic fields. We consider
a case, in which magnetic axes of a dipole and quadrupole components of the
magnetic field are not aligned. To examine observational manifestations of such
fields we have generated thermal light curves for the obtained temperature
distributions using a composite black-body model. It is shown, that the
simplest (only zero-order spherical function in quadrupole component)
non-coaxial dipole-plus-quadrupole magnetic field distribution can
significantly affect the thermal light curves, making pulse profiles
non-symmetric and amplifying pulsations in comparison to the pure-dipolar
field.
Determination of a magnetic field structure on a neutron star (NS) surface is
an important problem of a modern astrophysics. In a presence of strong magnetic
fields a thermal conductivity of a degenerate matter is anisotropic. In this
paper we present 3D anisotropic heat transfer simulations in outer layers of
magnetized NSs, and construct synthetic thermal light curves. We have used a
different from previous works tensorial thermal conductivity coefficient of
electrons, derived from the analytical solution of the Boltzmann equation by
the Chapman-Enskog method. We have obtained a NS surface temperature
distribution in presence of dipole-plus-quadrupole magnetic fields. We consider
a case, in which magnetic axes of a dipole and quadrupole components of the
magnetic field are not aligned. To examine observational manifestations of such
fields we have generated thermal light curves for the obtained temperature
distributions using a composite black-body model. It is shown, that the
simplest (only zero-order spherical function in quadrupole component)
non-coaxial dipole-plus-quadrupole magnetic field distribution can
significantly affect the thermal light curves, making pulse profiles
non-symmetric and amplifying pulsations in comparison to the pure-dipolar
field.
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