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Evidence for reduced magnetic braking in polars from binary population models

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Belloni, Diogo, Schreiber, Matthias R., Pala, Anna F., Gaensicke, B. T., Zorotovic, Mónica and Rodrigues, Claudia V. (2020) Evidence for reduced magnetic braking in polars from binary population models. Monthly Notices of the Royal Astronomical Society, 491 (4). pp. 5717-5731. doi:10.1093/mnras/stz3413 ISSN 1745-3933.

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Official URL: http://dx.doi.org/10.1093/mnras/stz3413

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Abstract

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 ≳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 ≳3 h, and the absence of period bouncers in observed samples.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Stars, New , Cataclysmic variable stars, Stars -- Evolution, Stars -- Magnetic fields , White dwarf stars
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 1745-3933
Official Date: February 2020
Dates:
DateEvent
February 2020Published
16 December 2019Available
2 December 2019Accepted
Volume: 491
Number: 4
Page Range: pp. 5717-5731
DOI: 10.1093/mnras/stz3413
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Diogo Belloni, Matthias R Schreiber, Anna F Pala, Boris T Gänsicke, Mónica Zorotovic, Claudia V Rodrigues, Evidence for reduced magnetic braking in polars from binary population models, Monthly Notices of the Royal Astronomical Society, Volume 491, Issue 4, February 2020, Pages 5717–5731, is available online at: https://doi.org/10.1093/mnras/stz3413
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 13 January 2020
Date of first compliant Open Access: 15 January 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
#2017/14289-3Fundação de Amparo à Pesquisa do Estado de São PauloUNSPECIFIED
#2018/23562-8Fundação de Amparo à Pesquisa do Estado de São PauloUNSPECIFIED
1181404[FONDECYT] Fondo Nacional de Desarrollo Científico y Tecnológicohttp://dx.doi.org/10.13039/501100002850
ST/P000495[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
79170121[CONICYT] Comisión Nacional de Investigación Científica y Tecnológicahttp://dx.doi.org/10.13039/501100002848
1170559[CONICYT] Comisión Nacional de Investigación Científica y Tecnológicahttp://dx.doi.org/10.13039/501100002848
303444/2018-5Conselho Nacional de Desenvolvimento Científico e TecnológicoUNSPECIFIED
2013/26258-4Fundação de Amparo à Pesquisa do Estado de São PauloUNSPECIFIED

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