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Doppler-imaging of the planetary debris disc at the white dwarf SDSS J122859.93+104032.9
Christopher J. Manser, Boris T. Gaensicke, Thomas R. Marsh +6
Debris discs which orbit white dwarfs are signatures of remnant planetary systems. We present twelve years of optical spectroscopy of the metal-polluted white dwarf SDSS J1228+1040…
New white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12
S. O. Kepler, Ingrid Pelisoli, Detlev Koester +7
We report the discovery of 6576 new spectroscopically confirmed white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12. We obtain Teff, log g and mass for h…
DB white dwarfs in the Sloan Digital Sky Survey Data Release 10 and 12
Detlev Koester, S. O. Kepler
White dwarfs with helium-dominated atmospheres comprise approximately 20% of all white dwarfs. Among the open questions are the total masses and the origin of the hydrogen traces o…
Total eclipse of the heart: The AM CVn Gaia14aae / ASSASN-14cn
H. C. Campbell, T. R. Marsh, M. Fraser +82
We report the discovery and characterisation of a deeply eclipsing AM CVn-system, Gaia14aae (= ASSASN-14cn). Gaia14aae was identified independently by the All-Sky Automated Survey…
The Composition Of A Disrupted Extrasolar Planetesimal At SDSS J0845+2257 (Ton 345)
David J. Wilson, Boris T. Gaensicke, Detlev Koester +4
We present a detailed study of the metal-polluted DB white dwarf SDSS J0845+2257 (Ton 345). Using high-resolution HST/COS and VLT spectroscopy, we have detected hydrogen and eleven…
A double white dwarf with a paradoxical origin?
M. C. P. Bours, T. R. Marsh, B. T. Gaensicke +14
We present Hubble Space Telescope UV spectra of the 4.6 h period double white dwarf SDSS J125733.63+542850.5. Combined with Sloan Digital Sky Survey optical data, these reveal that…