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Modelling the intermediate polars using the CYCLOPS code

Grant number: 15/24393-7
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): May 01, 2016
Effective date (End): February 25, 2020
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
Principal researcher:Cláudia Vilega Rodrigues
Grantee:Isabel de Jesus Lima
Home Institution: Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia e Inovações (Brasil). São José dos Campos , SP, Brazil
Associated research grant:13/26258-4 - Superdense matter in the universe, AP.TEM
Associated scholarship(s):18/05420-1 - Magnetic accretion in cataclysmic variables: SW~Sextantis stars and a search for new objects, BE.EP.DR


Intermediate polars are cataclysmic variables, binary systems in which mass transfer occurs from a low-mass star onto a white dwarf. The white-dwarf magnetic field partially controls the accretion geometry, however it is not strong enough to synchronize the rotational periods of the white dwarf with the orbital period. Some systems may evolve to synchronization. Accretion onto the white dwarf occurs via magnetic columns or curtains and far from the compact object there may exist an accretion disk, depending on the magnetic field intensity. Magnetic accretion forms a shock near the white dwarf, and \textit{bremsstrahlung} emission dominates in X-rays and cyclotron emission is important in optical wavelengths.This PhD proposal aims to apply the CYCLOPS code to intermediate polars. CYCLOPS was developed by our group for multiwavelength fitting of the post-shock region of objects having magnetic accretion. The code calculates the radiative transport along a non-homogeneous region in terms of density, temperature, and magnetic field. The three-dimensional treatment of the post-shock region is a unique feature of our code. These ingredients are essential for understanding the orbital phase modulation of intermediate polars, allowing a self-consistent approach to the problem.

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