SDSS J105754.25+275947.5: a period-bounce eclipsing cataclysmic variable with the lowest-mass donor yet measured.
In: Monthly Notices of the Royal Astronomical Society, Jg. 467 (2017-05-11), Heft 1, S. 1024-1032
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Zugriff:
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 ±0.015Mʘ and Md = 0.0436 ±0.0020Mʘ, 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. [ABSTRACT FROM AUTHOR]
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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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Autor/in / Beteiligte Person: | McAllister, M. J. ; Littlefair, S. P. ; Dhillon, V. S. ; Marsh, T. R. ; Gänsicke, B. T. ; Bochinski, J. ; Bours, M. C. P. ; Breedt, E. ; Hardy, L. K. ; Hermes, J. J. ; Kengkriangkrai, S. ; Kerry, P. ; Parsons, S. G. ; Rattanasoon, S. |
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Zeitschrift: | Monthly Notices of the Royal Astronomical Society, Jg. 467 (2017-05-11), Heft 1, S. 1024-1032 |
Veröffentlichung: | 2017 |
Medientyp: | academicJournal |
ISSN: | 0035-8711 (print) |
DOI: | 10.1093/mnras/stx253 |
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