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SDSS J105754.25+275947.5 : a period-bounce eclipsing cataclysmic variable with the lowest-mass donor yet measured
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McAllister, M. J., Littlefair, S. P., Dhillon, V. S., Marsh, Tom, Gänsicke, B. T. (Boris T.), Bochinski, J., Bours, Madelon C. P., Breedt, E., Hardy, L. K., Hermes, J. J., Kengkriangkrai, S., Kerry, P., Parsons, S. G. and Rattanasoon, S. (2017) SDSS J105754.25+275947.5 : a period-bounce eclipsing cataclysmic variable with the lowest-mass donor yet measured. Monthly Notices of the Royal Astronomical Society, 467 (1). pp. 1024-1032. doi:10.1093/mnras/stx253 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stx253
Abstract
We present high-speed, multicolour photometry of the faint, eclipsing cataclysmic variable (CV) SDSS J105754.25+275947.5. The light from this system is dominated by the white dwarf. Nonetheless, averaging many eclipses reveals additional features from the eclipse of the bright spot. This enables the fitting of a parametrized eclipse model to these average light curves, allowing the precise measurement of system parameters. We find a mass ratio of q = 0.0546 ± 0.0020 and inclination i = 85.74 ± 0.21°. The white dwarf and donor masses were found to be Mw = 0.800 ± 0.015 M⊙ and Md = 0.0436 ± 0.0020 M⊙, respectively. A temperature Tw = 13300 ± 1100 K and distance d = 367 ± 26 pc of the white dwarf were estimated through fitting model atmosphere predictions to multicolour fluxes. The mass of the white dwarf in SDSS 105754.25+275947.5 is close to the average for CV white dwarfs, while the donor has the lowest mass yet measured in an eclipsing CV. A low-mass donor and an orbital period (90.44 min) significantly longer than the period minimum strongly suggest that this is a bona fide period-bounce system, although formation from a white dwarf/brown dwarf binary cannot be ruled out. Very few period-minimum/period-bounce systems with precise system parameters are currently known, and as a consequence the evolution of CVs in this regime is not yet fully understood.
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): | 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: | 26 January 2017 | ||||||||
Dates: |
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Volume: | 467 | ||||||||
Number: | 1 | ||||||||
Page Range: | pp. 1024-1032 | ||||||||
DOI: | 10.1093/mnras/stx253 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Date of first compliant deposit: | 17 March 2017 | ||||||||
Date of first compliant Open Access: | 17 March 2017 | ||||||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC), Leverhulme Trust (LT), United States. National Aeronautics and Space Administration (NASA), Seventh Framework Programme (European Commission) (FP7) | ||||||||
Grant number: | ST/J001589/1, ST/L000733/1 (STFC), HST-HF2-51357.001-A. (NASA), FP/2007-2013/ERC Grant Agreement no. 320964 WDTracer (FP7) |
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