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Evidence for mass accretion driven by spiral shocks onto the white dwarf in SDSS J123813.73-033933.0
A. F. Pala, B. T. Gänsicke, T. R. Marsh +21
We present high-time-resolution photometry and phase-resolved spectroscopy of the short-period () cataclysmic variable SDSS J123813.73-033933.…
Spectroscopy of the cataclysmic variable ES Ceti
K. Bakowska, T. R. Marsh
We present results of our spectroscopic campaign dedicated to the ultracompact binary ES Ceti. On the nights 2002 Oct. 27-28, 528 spectra were taken with the 6.5-meter telescope in…
The population of hot subdwarf stars studied with Gaia II. The Gaia DR2 catalogue of hot subluminous stars
S. Geier, R. Raddi, N. P. Gentile Fusillo +1
Based on data from the ESA Gaia Data Release 2 (DR2) and several ground-based, multi-band photometry surveys we compiled an all-sky catalogue of hot subluminous star cand…
The physical properties of AM CVn stars: new insights from Gaia DR2
G. Ramsay, M. J. Green, T. R. Marsh +9
AM CVn binaries are hydrogen deficient compact binaries with an orbital period in the 5-65 min range and are predicted to be strong sources of persistent gravitational wave radiati…
The direct detection of the irradiated brown dwarf in the white dwarf - brown dwarf binary SDSS J141126.20+200911.1
S. L. Casewell, S. P. Littlefair, S. G. Parsons +3
We have observed the eclipsing, post-common envelope white dwarf-brown dwarf binary, SDSS141126.20+200911.1, in the near-IR with the HAWK-I imager, and present here the first direc…
A Large Ground-Based Observing Campaign of the Disintegrating Planet K2-22b
Knicole D. Colón, George Zhou, Avi Shporer +27
We present 45 ground-based photometric observations of the K2-22 system collected between December 2016 and May 2017, which we use to investigate the evolution of the transit of th…
The scatter of the M dwarf mass-radius relationship
S. G. Parsons, B. T. Gänsicke, T. R. Marsh +14
M dwarfs are prime targets in the hunt for habitable worlds around other stars. This is due to their abundance as well as their small radii and low masses and temperatures, which f…
First light with HiPERCAM on the GTC
Vikram Dhillon, Simon Dixon, Trevor Gamble +20
HiPERCAM is a quintuple-beam imager that saw first light on the 4.2m William Herschel Telescope (WHT) in October 2017 and on the 10.4m Gran Telescopio Canarias (GTC) in February 20…
A Data Release 2 catalogue of white dwarfs and a comparison with SDSS
Nicola Pietro Gentile Fusillo, Pier-Emmanuel Tremblay, Boris T. Gänsicke +11
We present a catalogue of white dwarf candidates selected from the second data release of (DR2). We used a sample of spectroscopically confirmed white dwarfs from the Sloan…
LISA verification binaries with updated distances from Gaia Data Release 2
T. Kupfer, V. Korol, S. Shah +6
Ultracompact binaries with orbital periods less than a few hours will dominate the gravitational wave signal in the mHz regime. Until recently, 10 systems were expected have a pred…
Detection of a 23.6 min periodic modulation in the optical counterpart of 3XMMJ051034.6--670353
G. Ramsay, T. Marsh, T. Kupfer +4
We present high speed optical photometric observations made using the NTT and ULTRACAM of the optical counterpart of 3XMMJ051034.6--670353, which was recently identified as an X-ra…
Flickering in AGB stars: Probing the nature of accreting companions
S. Snaid, A A. Zijlstra, I. McDonald +3
Binary companions to asymptotic giant branch (AGB) stars are an important aspect of their evolution. Few AGB companions have been detected, and in most cases it is difficult to dis…
High-Speed Photometry of Gaia14aae: An Eclipsing AM CVn That Challenges Formation Models
M. J. Green, T. R. Marsh, D. T. H. Steeghs +19
AM CVn-type systems are ultra-compact, hydrogen-deficient accreting binaries with degenerate or semi-degenerate donors. The evolutionary history of these systems can be explored by…