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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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Official URL: https://doi.org/10.1093/mnras/sty2434

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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
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:
DateEvent
5 September 2018Published
3 September 2018Available
3 September 2018Accepted
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
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDSwedish National Space Boardhttp://dx.doi.org/10.13039/501100001859
UNSPECIFIEDDeutsches Zentrum für Luft- und Raumfahrthttp://dx.doi.org/10.13039/501100002946
UNSPECIFIED[MINECO] Ministerio de Economía y Competitividadhttp://dx.doi.org/10.13039/501100003329
UNSPECIFIEDNederlandse Onderzoekschool voor Astronomiehttp://viaf.org/viaf/1013145857049322921358
UNSPECIFIEDCentre National d’Etudes Spatialeshttp://dx.doi.org/10.13039/501100002830
UNSPECIFIEDEuropean Space Agencyhttp://dx.doi.org/10.13039/501100000844
UNSPECIFIEDUK Space Agencyhttp://dx.doi.org/10.13039/100011690
UNSPECIFIEDAgenzia Spaziale Italianahttp://dx.doi.org/10.13039/501100003981
320964 (WDTracer)Seventh Framework Programmehttp://dx.doi.org/10.13039/100011102
UNSPECIFIEDEuropean Southern Observatoryhttp://dx.doi.org/10.13039/501100004604
UNSPECIFIEDCentro de Astrofísica de Valparaíso (CAV)UNSPECIFIED

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