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The "DODO" survey I: limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa 2)
M. R. Burleigh, F. J. Clarke, E. Hogan +8
We report limits in the planetary-mass regime for companions around the nearest single white dwarf to the Sun, van Maanen's star (vMa 2), from deep J-band imaging with Gemini North…
The pulsation modes of the pre-white dwarf PG 1159-035
J. E. S. Costa, S. O. Kepler, D. E. Winget +74
PG 1159-035, a pre-white dwarf with T_eff=140,000 K, is the prototype of both two classes: the PG1159 spectroscopic class and the DOV pulsating class. Previous studies of PG 1159-0…
A Near-Infrared Spectroscopic Study of the Accreting Magnetic White Dwarf SDSS J121209.31+013627.7 and its Substellar Companion
J. Farihi, M. R. Burleigh, D. W. Hoard
The nature of the excess near-infrared emission associated with the magnetic white dwarf commonly known as SDSS 1212 is investigated primarily through spectroscopy, and also via ph…
Near-infrared spectroscopy of the very low mass companion to the hot DA white dwarf PG1234+482
P. R. Steele, M. R. Burleigh, P. D. Dobbie +1
We present a near-infrared spectrum of the hot ( 55,000 K) DA white dwarf PG 1234+482. We confirm that a very low mass companion is responsible for the previ…
GRB 060206 and the quandary of achromatic breaks in afterglow light curves
P. A. Curran, A. J. van der Horst, R. A. M. J. Wijers +20
Gamma-ray burst afterglow observations in the Swift era have a perceived lack of achromatic jet breaks compared to the BeppoSAX era. We present our multi-wavelength analysis of GRB…
Search for Giant Planets around White Dwarfs with HST, Spitzer, and VLT
S. Friedrich, H. Zinnecker, S. Correia +3
For the last three years we have performed a survey for young (<3 Gyrs) giant planets around nearby white dwarfs with HST, Spitzer, and VLT. Direct HST/NICMOS imaging of the seven…
A near-infrared spectroscopic detection of the brown dwarf in the post common envelope binary WD0137-349
M. R. Burleigh, E. Hogan, P. D. Dobbie +2
We present a near-infrared spectrum of the close, detached white dwarf + brown dwarf binary WD0137-349 (Maxted et al 2006), that directly reveals the substellar companion through a…
On the origin of the ultramassive white dwarf GD50
P. D. Dobbie, R. Napiwotzki, N. Lodieu +3
We argue on the basis of astrometric and spectroscopic data that the ultramassive white dwarf GD50 is associated with the star formation event that created the Pleiades and is poss…
The nature of the close magnetic white dwarf + probable brown dwarf binary SDSS J121209.31+013627.7
M. R. Burleigh, T. R. Marsh, B. T. Gansicke +16
Optical time series photometry of the short period magnetic white dwarf + probable brown dwarf binary SDSS 121209.31+013627.7 reveals pulse-like variability in all bands from i' to…
New Praesepe white dwarfs and the initial mass-final mass relation
P. D. Dobbie, R. Napiwotzki, M. R. Burleigh +6
We report the spectroscopic confirmation of four further white dwarf members of Praesepe. This brings the total number of confirmed white dwarf members to eleven making this the se…
A search for binarity using FUSE observations of DAO white dwarfs
S. A. Good, M. A. Barstow, M. R. Burleigh +2
We report on a search for evidence of binarity in Far-Ultraviolet Spectroscopic Explorer (FUSE) observations of DAO white dwarfs. Spectra recorded by FUSE are built up from a numbe…
Photospheric phosphorus in the FUSE spectra of GD71 and two similar DA white dwarfs
Paul Dobbie, Martin Barstow, Ivan Hubeny +3
We report the detection, from FUSE data, of phosphorus in the atmospheres of GD71 and two similar DA white dwarfs. This is the first detection of a trace metal in the photosphere o…
Heavy element abundances in DAO white dwarfs measured from FUSE data
S. A. Good, M. A. Barstow, M. R. Burleigh +3
We present heavy element abundance measurements for 16 DAO white dwarfs, determined from Far-Ultraviolet Spectroscopic Explorer {FUSE} spectra. Evidence of absorption by heavy elem…
Hubble Space Telescope Spectroscopy of the Balmer lines in Sirius B
M. A. Barstow, Howard E. Bond, J. B. Holberg +3
Sirius B is the nearest and brightest of all white dwarfs, but it is very difficult to observe at visible wavelengths due to the overwhelming scattered light contribution from Siri…
A near-IR spectrum of the DO white dwarf RE J0503-285
Paul Dobbie, Matt Burleigh, Andrew Levan +4
We present a near-IR spectroscopic analysis of the intriguing DO white dwarf RE J0503-285. The IR spectrum fails to reveal evidence of the presence of a spatially unresolved, cool,…
A near-IR spectroscopic search for very-low-mass cool companions to notable DA white dwarfs
P. D. Dobbie, M. R. Burleigh, A. J. Levan +5
We have undertaken a detailed near-IR spectroscopic analysis of eight notable white dwarfs, predominantly of southern declination. In each case the spectrum failed to reveal compel…
Rotational period of WD1953-011 - a magnetic white dwarf with a star spot
C. S. Brinkworth, T. R. Marsh, L. Morales-Rueda +3
WD1953-011 is an isolated, cool (7920 +/- 200K, Bergeron, Legget & Ruiz, 2001) magnetic white dwarf (MWD) with a low average field strength (~70kG, Maxted et al. 2000) and a higher…
Whole Earth Telescope observations of BPM 37093: a seismological test of crystallization theory in white dwarfs
A. Kanaan, A. Nitta, D. E. Winget +3
BPM 37093 is the only hydrogen-atmosphere white dwarf currently known which has sufficient mass (~ 1.1 M_sun) to theoretically crystallize while still inside the ZZ Ceti instabilit…
Praesepe and the seven white dwarfs
P. D. Dobbie, D. J. Pinfield, R. Napiwotzki +5
We report the discovery, from our preliminary survey of the Praesepe open cluster, of two new spectroscopically confirmed white dwarf candidate members. We derive the effective tem…
Photometric variability of the unique magnetic white dwarf GD356
C. S. Brinkworth, M. R. Burleigh, G. A. Wynn +1
GD356 is a magnetic white dwarf (B = 13MG) that uniquely displays weak resolved Zeeman triplets of Halpha and Hbeta in emission. As such, GD356 may be the only known white dwarf wi…
Observations of the pulsating subdwarf B star Feige 48: Constraints on evolution and companions
M. D. Reed, S. D. Kawaler
Since pulsating subdwarf B (sdBV or EC14026) stars were first discovered (Kilkenny et al, 1997), observational efforts have tried to realize their potential for constraining the in…
A comparison of DA white dwarf temperatures and gravities from FUSE Lyman line and ground-based Balmer line observations
M. A. Barstow, S. A. Good, M. R. Burleigh +3
Observation of the strengths and profiles of the hydrogen Balmer absorption series is an established technique for determining the effective temperature and surface gravity of hot…
Heavy element abundance patterns in hot DA white dwarfs
M. A. Barstow, S. A. good, J. B. Holberg +5
We present a series of systematic abundance measurements for 25 hot DA white dwarfs in the temperature range ~20000-110000K, based on far-UV spectroscopy with STIS/GHRS on HST, IUE…
PG1115+166 - a long period DA+DB binary
P. F. L. Maxted, M. R. Burleigh, T. R. Marsh +1
We present spectra of the DAB white dwarf PG1115+166. Radial velocity measurements of the Balmer lines and the HeI6678 line show that this is a binary white dwarf with a period of…