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Phase-resolved spectroscopy of the helium dwarf nova 'SN 2003aw' in quiescence
G. Roelofs, P. Groot, T. Marsh +2
High time resolution spectroscopic observations of the ultra-compact helium dwarf nova 'SN 2003aw' in its quiescent state at V=20.5 reveal its orbital period at 2027.8 +/- 0.5 seco…
A ZZ Ceti white dwarf in SDSS J133941.11+484727.5
B. T. Gaensicke, P. Rodriguez-Gil, T. R. Marsh +19
We present time-resolved spectroscopy and photometry of the cataclysmic variable (CV) SDSSJ133941.11+484727.5 (SDSS1339) which has been discovered in the Sloan Digital Sky Survey D…
LISA astronomy of double white dwarf binary systems
A. Stroeer, A. Vecchio, G. Nelemans
The Laser Interferometer Space Antenna (LISA) will provide the largest observational sample of (interacting) double white dwarf binaries, whose evolution is driven by radiation rea…
Period Changes in Ultra-compact Double White Dwarfs
T. R. Marsh, G. Nelemans
In recent years there has been much interest in the nature of two stars, V407 Vul and RXJ0806+1527, which are widely thought to be binary white dwarfs of very short orbital period,…
Binaries discovered by the SPY project. IV. Five single-lined DA double white dwarfs
G. Nelemans, R. Napiwotzki, C. Karl +8
We present results from our ongoing follow-up observations of double white dwarf binaries detected in the ESO SN Ia Progenitor SurveY (SPY). We discuss our observing strategy and d…
XMM-Newton observations of AM CVn binaries
Gavin Ramsay, Pasi Hakala, Tom Marsh +3
We present the results of XMM-Newton observations of four AM CVn systems -- AM CVn, CR Boo, HP Lib and GP Com. Their light curves show very different characteristics. The X-ray lig…
The White Dwarf -- White Dwarf galactic background in the LISA data
Jeffrey A. Edlund, Massimo Tinto, Andrzej Krolak +1
LISA (Laser Interferometer Space Antenna) is a proposed space mission, which will use coherent laser beams exchanged between three remote spacecraft to detect and study low-frequen…
Simulation of the White Dwarf -- White Dwarf galactic background in the LISA data
Jeffrey A. Edlund, Massimo Tinto, Andrzej Królak +1
LISA (Laser Interferometer Space Antenna) is a proposed space mission, which will use coherent laser beams exchanged between three remote spacecraft to detect and study low-frequen…
Identification of 13 DB + dM and 2 DC + dM binaries from the Sloan Digital Sky Survey
E. J. M. van den Besselaar, G. H. A. Roelofs, G. A. Nelemans +2
We present the identification of 13 DB + dM binaries and 2 DC + dM binaries from the Sloan Digital Sky Survey (SDSS). Before the SDSS only 2 DB + dM binaries and 1 DC + dM binary w…
Six detached white-dwarf close binaries
L. Morales-Rueda, T. R. Marsh, P. F. L. Maxted +4
We determine the orbits of four double degenerate systems (DDs), composed of two white dwarfs, and of two white dwarf -- M dwarf binaries. The four DDs, WD1022+050, WD1428+373, WD1…
Arbitrarily Degenerate Helium White Dwarfs as Donors in AM CVn Binaries
Christopher J. Deloye, Lars Bildsten, Gijs Nelemans
We apply the Deloye & Bildsten (2003) isentropic models for donors in ultracompact low-mass X-ray binaries to the AM CVn population of ultracompact, interacting binaries. The mass-…