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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Evidence for reduced magnetic braking in polars from binary population models

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Belloni, Diogo [1, 2] ; Schreiber, Matthias R. [1, 3] ; Pala, Anna F. [4] ; Gansicke, Boris T. [5] ; Zorotovic, Monica [1] ; Rodrigues, V, Claudia
Total Authors: 6
[1] Univ Valparaiso, Inst Fis & Astron, Av Gran Bretana 1111, Valparaiso 2360102 - Chile
[2] V, Natl Inst Space Res, Av Astronautas 1758, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[3] Univ Valparaiso, Millenium Nucleus Planet Format, Valparaiso 2360102 - Chile
[4] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching - Germany
[5] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands - England
Total Affiliations: 5
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 491, n. 4, p. 5717-5731, FEB 2020.
Web of Science Citations: 1

We present the first population synthesis of synchronous magnetic cataclysmic variables, called polars, taking into account the effect of the white dwarf (WD) magnetic field on angular momentum loss. We implemented the reduced magnetic braking (MB) model proposed by Li, Wu \& Wickramasinghe into the Binary Stellar Evolution (BSE) code recently calibrated for cataclysmic variable (CV) evolution. We then compared separately our predictions for polars and non-magnetic CVs with a large and homogeneous sample of observed CVs from the Sloan Digital Sky Survey. We found that the predicted orbital period distributions and space densities agree with the observations if period bouncers are excluded. For polars, we also find agreement between predicted and observed mass transfer rates, while the mass transfer rates of non-magnetic CVs with periods greater than or similar to 3 h drastically disagree with those derived from observations. Our results provide strong evidence that the reduced MB model for the evolution of highly magnetized accreting WDs can explain the observed properties of polars. The remaining main issues in our understanding of CV evolution are the origin of the large number of highly magnetic WDs, the large scatter of the observed mass transfer rates for non-magnetic systems with periods greater than or similar to 3 h, and the absence of period bouncers in observed samples. (AU)

FAPESP's process: 18/23562-8 - Investigating the origin of Type Ia supernovae with the BSE code
Grantee:Diogo Teixeira Belloni
Support type: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 13/26258-4 - Superdense matter in the universe
Grantee:Manuel Máximo Bastos Malheiro de Oliveira
Support type: Research Projects - Thematic Grants
FAPESP's process: 17/14289-3 - Magnetic Cataclysmic variables: secular evolution with the BSE code and emission modelling with the CYCLOPS code
Grantee:Diogo Teixeira Belloni
Support type: Scholarships in Brazil - Post-Doctorate