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A search for the hidden population of AM CVn binaries in the Sloan Digital Sky Survey
P. J. Carter, T. R. Marsh, D. Steeghs +7
We present the latest results from a spectroscopic survey designed to uncover the hidden population of AM Canum Venaticorum (AM CVn) binaries in the photometric database of the Slo…
An accurate mass and radius measurement for an ultracool white dwarf
S. G. Parsons, B. T. Gänsicke, T. R. Marsh +6
Studies of cool white dwarfs in the solar neighbourhood have placed a limit on the age of the Galactic disk of 8-9 billion years. However, determining their cooling ages requires t…
The Unseen Population of F to K-type Companions to Hot Subdwarf Stars
J. Girven, D. Steeghs, U. Heber +6
We present a method to select hot subdwarf stars with A to M-type companions using photometric selection criteria. We cover a wide range in wavelength by combining GALEX ultraviole…
The evolutionary state of short period magnetic white dwarf binaries
E. Breedt, B. T. Gaensicke, J. Girven +4
We present phase-resolved spectroscopy of two new short period low accretion rate magnetic binaries, SDSSJ125044.42+154957.3 (Porb = 86 min) and SDSSJ151415.65+074446.5 (Porb = 89…
Mass ratio from Doppler beaming and Rømer delay versus ellipsoidal modulation in the Kepler data of KOI-74
S. Bloemen, T. R. Marsh, P. Degroote +18
We present a light curve analysis and radial velocity study of KOI-74, an eclipsing A star + white dwarf binary with a 5.2 day orbit. Aside from new spectroscopy covering the orbit…
A Radial Velocity Study of CTCV J1300-3052
C. D. J. Savoury, S. P. Littlefair, T. R. Marsh +4
We present time-resolved spectroscopy of the eclipsing, short period cataclysmic variable CTCV J1300-3052. Using absorption features from the secondary star, we determine the radia…