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SDSS J105754.25+275947.5: a period-bounce eclipsing cataclysmic variable with the lowest-mass donor yet measured | | M. J. McAllister
; S. P. Littlefair
; V. S. Dhillon
; T. R. Marsh
; B. T. Gänsicke
; J. Bochinksi
; M. C. P. Bours
; E. Breedt
; L. K. Hardy
; J. J. Hermes
; S. Kengkriangkrai
; P. Kerry
; S. G. Parsons
; S. Rattanasoon
; | | Date: |
26 Jan 2017 | | 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 parameterised eclipse model to these average light curves,
allowing the precise measurement of system parameters. We find a mass ratio of
q = 0.0546 $pm$ 0.0020 and inclination i = 85.74 $pm$ 0.21$^{circ}$. The
white dwarf and donor masses were found to be M$_{mathrm{w}}$ = 0.800 $pm$
0.015 M$_{odot}$ and M$_{mathrm{d}}$ = 0.0436 $pm$ 0.0020 M$_{odot}$,
respectively. A temperature T$_{mathrm{w}}$ = 13300 $pm$ 1100 K and distance
d = 367 $pm$ 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. | | Source: | arXiv, 1701.7892 | | Services: | Forum | Review | PDF | Favorites | |
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