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28 papers
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…
A photometric and astrometric investigation of the brown dwarfs in Blanco 1
S. L. Casewell, D. E. A. Baker, R. F. Jameson +3
We present the results of a photometric and astrometric study of the low mass stellar and substellar population of the young open cluster Blanco 1. We have exploited J band data, o…
White dwarfs in the UKIDSS Large Area Survey: The Substellar Companion Fraction
P. R. Steele, M. R. Burleigh, P. D. Dobbie +3
We present a near-infrared photometric search for unresolved substellar companions and debris disks around white dwarfs in the UKIRT Infrared Deep Sky Survey Large Area Survey. We…
Brown Dwarf Companions to White Dwarfs
M. R. Burleigh, P. R. Steele, P. D. Dobbie +8
Brown dwarf companions to white dwarfs are rare, but recent infra-red surveys are slowly reveal- ing examples. We present new observations of the post-common envelope binary WD0137…
PHL 5038: A spatially resolved white dwarf + brown dwarf binary
P. R. Steele, M. R. Burleigh, J. Farihi +4
A near-infrared excess is detected at the white dwarf PHL5038 in UKIDSS photometry, consistent with the presence of a cool, substellar companion. We have obtained H- and K-grism sp…
High resolution optical spectroscopy of Praesepe white dwarfs
S. L. Casewell, P. D. Dobbie, R. Napiwotzki +3
We present the results of a high resolution optical spectroscopic study of nine white dwarf candidate members of Praesepe undertaken with the VLT and UVES. We find, contrary to a n…