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Constraining the Evolution of Cataclysmic Variables via the Masses and Accretion Rates of their Underlying White Dwarfs
A. F. Pala, B. T. Gänsicke, D. Belloni +28
We report on the masses (), effective temperatures () and secular mean accretion rates () of 43 cataclysmic variable (CV) wh…
Three dimensional Doppler tomography
T. R. Marsh
Doppler tomography is a method to compute the emissivity distribution within the co-rotating frames of binary stars from observations of their emission line profiles at multiple or…
Velocity-imaging the rapidly precessing planetary disc around the white dwarf HE 1349-2305 using Doppler tomography
Christopher J. Manser, Erik Dennihy, Boris T. Gänsicke +11
The presence of planetary material in white dwarf atmospheres, thought to be accreted from a dusty debris disc produced via the tidal disruption of a planetesimal, is common. Appro…
The SNIa Runaway LP 398-9: Detection of Circumstellar Material and Surface Rotation
Vedant Chandra, Hsiang-Chih Hwang, Nadia L. Zakamska +12
A promising progenitor scenario for Type Ia supernovae (SNeIa) is the thermonuclear detonation of a white dwarf in a close binary system with another white dwarf. After the primary…
Relentless and Complex Transits from a Planetesimal Debris Disk
J. Farihi, J. J. Hermes, T. R. Marsh +11
This article reports quasi-continuous transiting events towards WD 1054-226 at d=36.2 pc and V=16.0 mag, based on simultaneous, high-cadence, multi-wavelength imaging photometry us…
Optical detection of the rapidly spinning white dwarf in V1460 Her
Ingrid Pelisoli, T. R. Marsh, R. P. Ashley +15
Accreting magnetic white dwarfs offer an opportunity to understand the interplay between spin-up and spin-down torques in binary systems. Monitoring of the white dwarf spin may rev…
Discovery and characterization of five new eclipsing AM CVn systems
J. van Roestel, T. Kupfer, M. J. Green +19
AM CVn systems are ultra-compact, helium-rich, accreting binaries with degenerate or semi-degenerate donors. We report the discovery of five new eclipsing AM CVn systems with orbit…
Found: a rapidly spinning white dwarf in LAMOST J024048.51+195226.9
Ingrid Pelisoli, T. R. Marsh, V. S. Dhillon +9
We present optical photometry of the cataclysmic variable LAMOST J024048.51+195226.9 taken with the high-speed, five-band CCD camera HiPERCAM on the 10.4 m Gran Telescopio Canarias…
HiPERCAM: a quintuple-beam, high-speed optical imager on the 10.4-m Gran Telescopio Canarias
V. S. Dhillon, N. Bezawada, M. Black +36
HiPERCAM is a portable, quintuple-beam optical imager that saw first light on the 10.4-m Gran Telescopio Canarias (GTC) in 2018. The instrument uses re-imaging optics and 4 dichroi…
Optical photometry of two transitional millisecond pulsars in the radio pulsar state
James G. Stringer, Rene P. Breton, Colin J. Clark +7
We present ULTRACAM multiband optical photometry of two transitional millisecond pulsars, PSR J1023+0038 and PSR J12274853, taken while both were in their radio pulsar states. T…
System parameters of three short period cataclysmic variable stars
J. F. Wild, S. P. Littlefair, R. P. Ashley +9
Using photometric ULTRACAM observations of three new short period cataclysmic variables, we model the primary eclipse lightcurves to extract the orbital separation, masses, and rad…
The Evolution of Rapid Optical/X-ray Timing Correlations in the Initial Hard State of MAXI J1820+070
J. A. Paice, P. Gandhi, T. Shahbaz +11
We report on a multi-epoch campaign of rapid optical/X-ray timing observations of the superbright 2018 outburst of MAXI J1820+070, a black hole low-mass X-ray binary system. The ob…
Processing GOTO data with the Rubin Observatory LSST Science Pipelines II: Forced Photometry and light curves
L. Makrygianni, J. Mullaney, V. Dhillon +45
We have adapted the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) Science Pipelines to process data from the Gravitational-Wave Optical Transient Observer (GOTO)…
Measuring fundamental jet properties with multi-wavelength fast timing of the black hole X-ray binary MAXI J1820+070
A. J. Tetarenko, P. Casella, J. C. A. Miller-Jones +9
We present multi-wavelength fast timing observations of the black hole X-ray binary MAXI J1820+070 (ASASSN-18ey), taken with the Karl G. Jansky Very Large Array (VLA), Atacama Larg…
A test of the planet-star unipolar inductor for magnetic white dwarfs
N. Walters, J. Farihi, T. R. Marsh +7
Despite thousands of spectroscopic detections, only four isolated white dwarfs exhibit Balmer emission lines. The temperature inversion mechanism is a puzzle over 30 years old that…
TransitFit: combined multi-instrument exoplanet transit fitting for JWST, HST and ground-based transmission spectroscopy studies
J. J. C. Hayes, A. Priyadarshi, E. Kerins +19
We present TransitFit, a package designed to fit exoplanetary transit light-curves. TransitFit offers multi-epoch, multi-wavelength fitting of multi-telescope transit data. Transit…
Towards a volumetric census of close white dwarf binaries I.Reference samples
K. Inight, B. T. Gaensicke, E. Breedt +3
Close white dwarf binaries play an important role across a range of astrophysics, including thermonuclear supernovae, the Galactic low-frequency gravitational wave signal, and the…
Magnetic white dwarfs in post-common-envelope binaries
S. G. Parsons, B. T. Gänsicke, M. R. Schreiber +5
Magnitude-limited samples have shown that 20-25 per cent of cataclysmic variables contain white dwarfs with magnetic fields of Mega Gauss strength, in stark contrast to the approxi…