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MOCCA-SURVEY database I. Accreting white dwarf binary systems in globular clusters - IV. Cataclysmic variables - properties of bright and faint populations

Belloni, Diogo ; Giersz, Mirek ; Rivera Sandoval, Liliana E. ; Askar, Abbas LU orcid and Ciecielag, Paweł (2019) In Monthly Notices of the Royal Astronomical Society 483(1). p.315-331
Abstract

We investigate here populations of cataclysmic variables (CVs) in a set of 288 globular cluster (GC) models evolved with the MOCCA code. This is by far the largest sample of GC models ever analysed with respect to CVs. Contrary to what has been argued for a long time, we found that dynamical destruction of primordial CV progenitors is much stronger in GCs than dynamical formation of CVs, and that dynamically formed CVs and CVs formed under no/weak influence of dynamics have similar white dwarf mass distributions. In addition, we found that, on average, the detectable CV population is predominantly composed of CVs formed via a typical common envelope phase (CEP) (≳70 per cent), that only ≈2-4 per cent of all CVs in a GC are likely to be... (More)

We investigate here populations of cataclysmic variables (CVs) in a set of 288 globular cluster (GC) models evolved with the MOCCA code. This is by far the largest sample of GC models ever analysed with respect to CVs. Contrary to what has been argued for a long time, we found that dynamical destruction of primordial CV progenitors is much stronger in GCs than dynamical formation of CVs, and that dynamically formed CVs and CVs formed under no/weak influence of dynamics have similar white dwarf mass distributions. In addition, we found that, on average, the detectable CV population is predominantly composed of CVs formed via a typical common envelope phase (CEP) (≳70 per cent), that only ≈2-4 per cent of all CVs in a GC are likely to be detectable, and that core-collapsed models tend to have higher fractions of bright CVs than non-core-collapsed ones. We also consistently show, for the first time, that the properties of bright and faint CVs can be understood by means of the pre-CV and CV formation rates, their properties at their formation times and cluster half-mass relaxation times. Finally, we show that models following the initial binary population proposed by Kroupa and set with low CEP efficiency better reproduce the observed amount of CVs and CV candidates in NGC 6397, NGC 6752 and 47 Tuc. To progress with comparisons, the essential next step is to properly characterize the candidates as CVs (e.g. by obtaining orbital periods and mass ratios).

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Binaries: general, Cataclysmic variables, Globular clusters: general, Methods: numerical, Novae
in
Monthly Notices of the Royal Astronomical Society
volume
483
issue
1
pages
17 pages
publisher
Oxford University Press
external identifiers
  • scopus:85067303413
ISSN
0035-8711
DOI
10.1093/mnras/sty3097
language
English
LU publication?
yes
additional info
Funding Information: We would like to thank the anonymous referee for the comments and suggestions that helped to improve this manuscript. DB was supported by the grants #2017/14289-3 and #2013/26258-4, São Paulo Research Foundation (FAPESP), and acknowledges partial support from the National Science Centre, Poland, through the grant UMO-2016/21/N/ST9/02938. MG acknowledges partial support from the National Science Center, Poland, through the grant UMO-2016/23/B/ST9/02732. AA is supported by the Carl Tryggers Foundation for Scientific Research through the grant CTS 17:113.
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3690325b-a619-4489-9fa9-d3579e1072fc
date added to LUP
2022-03-31 12:56:48
date last changed
2024-04-13 13:04:59
@article{3690325b-a619-4489-9fa9-d3579e1072fc,
  abstract     = {{<p>We investigate here populations of cataclysmic variables (CVs) in a set of 288 globular cluster (GC) models evolved with the MOCCA code. This is by far the largest sample of GC models ever analysed with respect to CVs. Contrary to what has been argued for a long time, we found that dynamical destruction of primordial CV progenitors is much stronger in GCs than dynamical formation of CVs, and that dynamically formed CVs and CVs formed under no/weak influence of dynamics have similar white dwarf mass distributions. In addition, we found that, on average, the detectable CV population is predominantly composed of CVs formed via a typical common envelope phase (CEP) (≳70 per cent), that only ≈2-4 per cent of all CVs in a GC are likely to be detectable, and that core-collapsed models tend to have higher fractions of bright CVs than non-core-collapsed ones. We also consistently show, for the first time, that the properties of bright and faint CVs can be understood by means of the pre-CV and CV formation rates, their properties at their formation times and cluster half-mass relaxation times. Finally, we show that models following the initial binary population proposed by Kroupa and set with low CEP efficiency better reproduce the observed amount of CVs and CV candidates in NGC 6397, NGC 6752 and 47 Tuc. To progress with comparisons, the essential next step is to properly characterize the candidates as CVs (e.g. by obtaining orbital periods and mass ratios).</p>}},
  author       = {{Belloni, Diogo and Giersz, Mirek and Rivera Sandoval, Liliana E. and Askar, Abbas and Ciecielag, Paweł}},
  issn         = {{0035-8711}},
  keywords     = {{Binaries: general; Cataclysmic variables; Globular clusters: general; Methods: numerical; Novae}},
  language     = {{eng}},
  month        = {{02}},
  number       = {{1}},
  pages        = {{315--331}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{MOCCA-SURVEY database I. Accreting white dwarf binary systems in globular clusters - IV. Cataclysmic variables - properties of bright and faint populations}},
  url          = {{http://dx.doi.org/10.1093/mnras/sty3097}},
  doi          = {{10.1093/mnras/sty3097}},
  volume       = {{483}},
  year         = {{2019}},
}