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The cataclysmic variable QZ Lib : a period bouncer
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Pala, Anna F., Schmidtobreick, Linda, Tappert, Claus, Gänsicke, B. T. (Boris T.) and Mehner, A. (2018) The cataclysmic variable QZ Lib : a period bouncer. Monthly Notices of the Royal Astronomical Society, 481 (2). pp. 2523-2535. doi:10.1093/mnras/sty2434
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WRAP-cataclysmic-variable-QZ-Lib-period-bouncer-Pala-2018.pdf - Accepted Version - Requires a PDF viewer. Download (2726Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/sty2434
Abstract
While highly evolved cataclysmic variables (CVs) with brown dwarf donors, often called “period bouncers”, are predicted to make up ≃ 40 − 70% of the Galactic CV population, only a handful of such systems are currently known. The identification and characterization of additional period bouncers is therefore important to probe this poorly understood phase of CV evolution. We investigate the evolution of the CV QZ Lib following its 2004 super–outburst using multi–epoch spectroscopy. From time– resolved spectroscopic observations we measure the orbital period of the system, Porb = 0.06436(20) d, which, combined with the superhump period PSH = 0.064602(24) d, yields the system mass ratio, q = 0.040(9). From the analysis of the spectral energy distribution we determine the structure of the accretion disc and the white dwarf effective temperature, Teff = 10 500 ± 1500 K. We also derive an upper limit on the effective temperature of the secondary, Teff < 1700 K, corresponding to a brown dwarf of T spectral type. The low temperature of the white dwarf, the small mass ratio and the fact that the donor is not dominating the near–infrared emission are all clues of a post bounce system. Although it is possible that QZ Lib could have formed as a white dwarf plus a brown dwarf binary, binary population synthesis studies clearly suggest this scenario to be less likely than a period bouncer detection and we conclude that QZ Lib is a CV that has already evolved through the period minimum.
| Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||||||||||||||
| Divisions: | Faculty of Science > Physics | ||||||||||||||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Brown dwarf stars, Dwarf novae | ||||||||||||||||||||||||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||||||||||||||||||||||||||
| Publisher: | Oxford University Press | ||||||||||||||||||||||||||||||||||||
| ISSN: | 0035-8711 | ||||||||||||||||||||||||||||||||||||
| Official Date: | 5 September 2018 | ||||||||||||||||||||||||||||||||||||
| Dates: |
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| Date of first compliant deposit: | 1 October 2018 | ||||||||||||||||||||||||||||||||||||
| Volume: | 481 | ||||||||||||||||||||||||||||||||||||
| Number: | 2 | ||||||||||||||||||||||||||||||||||||
| Page Range: | pp. 2523-2535 | ||||||||||||||||||||||||||||||||||||
| DOI: | 10.1093/mnras/sty2434 | ||||||||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||||||||||||||
| Publisher Statement: | 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 A F Pala, L Schmidtobreick, C Tappert, B T Gänsicke, A Mehner; The cataclysmic variable QZ Lib: a period bouncer, Monthly Notices of the Royal Astronomical Society, Volume 481, Issue 2, 1 December 2018, Pages 2523–2535, https://doi.org/10.1093/mnras/sty2434 is available online at: https://doi.org/10.1093/mnras/sty2434 | ||||||||||||||||||||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||||||||||||||
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