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NLTT5306: The shortest Period Detached White Dwarf + Brown Dwarf Binary
P. R. Steele, R. P. Saglia, M. R. Burleigh +6
We have spectroscopically confirmed a brown dwarf mass companion to the hydrogen atmosphere white dwarf NLTT5306. The white dwarf's atmospheric parameters were measured using Sloan…
Origin of electron cyclotron maser-induced radio emissions at ultra-cool dwarfs: magnetosphere-ionosphere coupling currents
J. D. Nichols, M. R. Burleigh, S. L. Casewell +4
A number of ultra-cool dwarfs emit circularly polarised radio waves generated by the electron cyclotron maser instability. In the solar system such radio is emitted from regions of…
WD0837+185:the formation and evolution of an extreme mass ratio white dwarf-brown dwarf binary in Praesepe
S. L. Casewell, M. R. Burleigh, G. A. Wynn +6
There is a striking and unexplained dearth of brown dwarf companions in close orbits (< 3AU) around stars more massive than the Sun, in stark contrast to the frequency of stellar a…
Further investigation of white dwarfs in the open clusters NGC2287 and NGC3532
P. D. Dobbie, A. Day-Jones, K. A. Williams +5
We report the results of a CCD imaging survey, complimented by astrometric and spectroscopic follow-up studies, that aims to probe the fate of heavy-weight intermediate mass stars…
The origin of circumstellar features in the spectra of hot DA white dwarfs
N. J. Dickinson, M. A. Barstow, B. Y. Welsh +4
We have analysed a sample of 23 hot DAs to better understand the source of the circumstellar features reported in previous work. Unambiguous detections of circumstellar material ar…
Discovery of a stripped red giant core in a bright eclipsing binary star
P. F. L. Maxted, D. R. Anderson, M. R. Burleigh +12
We report the serendipitous discovery from WASP archive photometry of a binary star in which an apparently normal A-type star (J0247-25A) eclipses a smaller, hotter subdwarf star (…