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Magnetic Cataclysmic variables: secular evolution with the BSE code and emission modelling with the CYCLOPS code

Grant number: 17/14289-3
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): June 01, 2018
Effective date (End): May 31, 2021
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
Principal Investigator:Cláudia Vilega Rodrigues
Grantee:Diogo Teixeira Belloni
Home Institution: Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia, Inovações e Comunicações (Brasil). São José dos Campos , SP, Brazil
Associated research grant:13/26258-4 - Superdense matter in the universe, AP.TEM
Associated scholarship(s):18/23562-8 - Investigating the origin of Type Ia supernovae with the BSE code, BE.EP.PD


The objective of this project is to investigate magnetic cataclysmic variables (MCVs), which are interacting binaries in which a magnetic white dwarf accretes matter from a main sequence star or a slightly evolved star. MCVs can be used as natural laboratories to investigate binary formation and evolution, accretion processes, supernova Ia progenitors, interactions between high-density plasmas and very strong magnetic fields, etc. This proposal focuses on aspects associated with MCV secular evolution and emission with the BSE and CYCLOPS codes. The BSE code is a set of algorithms that describe the evolution of isolated and binary stars and that allow for realizing population synthesis of cataclysmic variables in a fast and accurate manner. The CYCLOPS code, on the other hand, allows for multispectral modeling of the post-shock region of MCVs by radiative transport calculation. Initially, we intend to create a catalogue containing observational and estimated properties - such as periods, masses, luminosities/distances, magnetic field - of known MCVs. We will utilize the BSE code to estimate properties of MCVs such as distributions of masses, mass ratios, periods, mass transfer rates, luminosities and magnitudes. These predictions will be compared to the information in our catalogue, including appropriate modeling of observational biases such as limitations due to distance or luminosity, so that we will be able to investigate MCV formation and evolution. In addition, we plan to create a CYCLOPS model database, which can be used to fit observational data and for consequential determination of the physical and geometric parameters of MCVs. Both the catalogue and the model database will be hosted by a web portal totally dedicated to MCVs.

Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
BELLONI, DIOGO; SCHREIBER, MATTHIAS R. Are white dwarf magnetic fields in close binaries generated during common-envelope evolution?. Monthly Notices of the Royal Astronomical Society, v. 492, n. 1, p. 1523-1529, FEB 2020. Web of Science Citations: 0.
BELLONI, DIOGO; SCHREIBER, MATTHIAS R.; PALA, ANNA F.; GANSICKE, BORIS T.; ZOROTOVIC, MONICA; RODRIGUES, V, CLAUDIA. Evidence for reduced magnetic braking in polars from binary population models. Monthly Notices of the Royal Astronomical Society, v. 491, n. 4, p. 5717-5731, FEB 2020. Web of Science Citations: 1.
OLIVEIRA, ALEXANDRE S.; RODRIGUES, CLAUDIA V.; PALHARES, MATHEUS S.; DIAZ, MARCOS P.; BELLONI, DIOGO; SILVA, KARLEYNE M. G. Optical observations and CYCLOPS post-shock region modelling of the polar V348 Pav. Monthly Notices of the Royal Astronomical Society, v. 489, n. 3, p. 4032-4042, NOV 2019. Web of Science Citations: 0.
BELLONI, DIOGO; GIERSZ, MIREK; SANDOVAL, LILIANA E. RIVERA; ASKAR, ABBAS; CIECIELAG, PAWEL. MOCCA-SURVEY database I. Accreting white dwarf binary systems in globular clusters - IV. Cataclysmic variables - properties of bright and faint populations. Monthly Notices of the Royal Astronomical Society, v. 483, n. 1, p. 315-331, FEB 2019. Web of Science Citations: 4.

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