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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
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WRAP-evidence-reduced-magnetic-braking-polars-models-Gaensicke-2020.pdf - Accepted Version - Requires a PDF viewer. Download (3923Kb) | Preview |
Official URL: http://dx.doi.org/10.1093/mnras/stz3413
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 | |||||||||||||||||||||||||||
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| 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: |
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| 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 | |||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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