171 citations · 1.5k across the 38 of their papers we have counts for
39 papers
Circular polarimetry of suspect wind-accreting pre-polars II
Pasi Hakala, Steven Parsons, Gavin Ramsay +2
The origin of white dwarf magnetic fields is an open question. Furthermore, such fields play a vital role in the evolution of interacting binary stars. Here we present a study of w…
V407 Vul: a triple star system with an AM CVn detectable by gravitational wave observatories
James Munday, Antonio C. Rodriguez, Nicole Reindl +23
The AM CVn class includes mass transferring, ultra-compact double white dwarf binaries with orbital periods on the timescale of minutes. A long-standing puzzle is that none of the…
No Period Change in Two Long-Period AM CVn Binaries
Matthew J. Green, Thomas R. Marsh, Jan van Roestel +25
Ultracompact binary systems, consisting of two compact objects in an orbit , should exhibit measurable rates of orbital period change () due t…
Photometric masses for long period CVs: the case study of CSS131106
M. Das, S. P. Littlefair, S. G. Parsons +15
We present high-speed photometry of the eclipsing cataclysmic variable CSS131106 J052412+004148. We determine the system parameters by modelling the eclipse lightcurve using the ph…
An eclipsing 8.56 minute orbital period mass-transferring binary
Emma T. Chickles, Joheen Chakraborty, Kevin B. Burdge +34
We report the discovery of ATLAS J101342.5-451656.8 (hereafter ATLAS J1013-4516), an 8.56 minute orbital period mass transferring AM Canum Venaticorum binary with mean Gaia magnitu…
Unveiling the white dwarf in the eclipsing polar HU Aquarii
A. D. Schwope, T. R. Marsh, S. G. Parsons +2
We present an analysis of high-speed u- and r-band photometry of the eclipsing polar HU Aquarii that was obtained with ULTRACAM mounted on the VLT. The observations were performed…
Expanding the ultracompacts: gravitational wave-driven mass transfer in the shortest-period binaries with accretion disks
Joheen Chakraborty, Kevin B. Burdge, Saul A. Rappaport +35
We report the discovery of three ultracompact binary white dwarf systems hosting accretion disks, with orbital periods of 7.95, 8.68, and 13.15 minutes. This significantly augments…
Measuring the Initial-Final Mass-Relation using wide double white dwarf binaries from Gaia DR3
Mark A. Hollands, Stuart P. Littlefair, Steven G. Parsons
The Initial-Final Mass-Relation (IFMR) maps the masses of main sequence stars to their white dwarf descendants. The most common approach to measure the IFMR has been to use white d…
The donor star radial velocity curve in the cataclysmic variable GY Cnc confirms white dwarf eclipse modelling mass
S. P. Littlefair, Pablo Rodríguez-Gil, T. R. Marsh +2
A large number of white dwarf and donor masses in cataclysmic variables have been found via modelling the primary eclipse, a method that relies on untested assumptions. Recent meas…
TIC 378898110: A Bright, Short-Period AM CVn Binary in TESS
Matthew J. Green, J. J. Hermes, Brad N. Barlow +22
AM CVn-type systems are ultracompact, helium-accreting binary systems which are evolutionarily linked to the progenitors of thermonuclear supernovae and are expected to be strong G…
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…
Doppler beaming factors for white dwarfs, main sequence stars, and giant stars Limb-darkening coefficients for 3D (DA and DB) white dwarf models
A. Claret, E. Cukanovaite, K. Burdge +3
We computed Doppler beaming factors for DA, DB, and DBA white dwarf models, as well as for main sequence and giant stars covering the transmission curves of the Sloan, UBVRI, HiPER…
The evolutionary status of Cataclysmic Variables: Eclipse modelling of 15 systems
M. McAllister, S. P. Littlefair, S. G. Parsons +13
We present measurements of the component masses in 15 Cataclysmic Variables (CVs) - 6 new estimates and 9 improved estimates. We provide new calibrations of the relationship betwee…
The first sub-70 minute non-interacting WD-BD system: EPIC212235321
S. L. Casewell, I. P. Braker, S. G. Parsons +9
We present the discovery of the shortest-period, non-interacting, white dwarf-brown dwarf post-common-envelope binary known. The K2 light curve shows the system, EPIC 21223532 has…
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…
Evidence for eccentric, precessing gaseous debris in the circumstellar absorption towards WD 1145+017
P. Wilson Cauley, Jay Farihi, Seth Redfield +3
We present time-series spectra revealing changes in the circumstellar line profiles for the white dwarf WD 1145+017. Over the course of 2.2 years, the spectra show complete velocit…
High proper motion objects towards the inner Milky Way: characterisation of newly identified nearby stars from the VISTA Variables in the Via Lactea Survey
M. Gromadzki, R. Kurtev, J. C. Beamin +10
The census of the Solar neighbourhood is still incomplete, as demonstrated by recent discoveries of many objects within 5-10 pc from the Sun. The area around the mid-plane and bulg…
Spectroscopic Evolution of Disintegrating Planetesimals: Minutes to Months Variability in the Circumstellar Gas Associated with WD 1145+017
Seth Redfield, Jay Farihi, P. Wilson Cauley +3
With the recent discovery of transiting planetary material around WD 1145+017, a critical target has been identified that links the evolution of planetary systems with debris disks…
The crowded magnetosphere of the post common envelope binary QS Virginis
S. G. Parsons, C. A. Hill, T. R. Marsh +8
We present high speed photometry and high resolution spectroscopy of the eclipsing post common envelope binary QS Virginis (QS Vir). Our UVES spectra span multiple orbits over more…
Fourteen new eclipsing white dwarf plus main-sequence binaries from the SDSS and Catalina surveys
S. G. Parsons, C. Agurto-Gangas, B. T. Gaensicke +13
We report on the search for new eclipsing white dwarf plus main-sequence (WDMS) binaries in the light curves of the Catalina surveys. We use a colour selected list of almost 2000 c…
Testing the planetary models of HU Aquarii
M. Bours, T. Marsh, E. Breedt +6
We present new eclipse observations of the polar (i.e. semi-detached magnetic white dwarf + M-dwarf binary) HU Aqr, and mid-egress times for each eclipse, which continue to be obse…
White paper: Gaia and the end states of stellar evolution
M. A Barstow, S. L. Casewell, S. Catalan +18
This is the product of a Gaia GREAT workshop on "Gaia and the end states of stellar evolution" held at the University of Leicester in April 2011.
Timing variations in the secondary eclipse of NN Ser
S. G. Parsons, T. R. Marsh, M. C. P. Bours +6
The eclipsing white dwarf plus main-sequence binary NN Serpentis provides one of the most convincing cases for the existence of circumbinary planets around evolved binaries. The ex…
Optical transmission photometry of the highly inflated exoplanet WASP-17b
J. Bento, P. J. Wheatley, C. M. Copperwheat +7
We present ground-based high-precision observations of the transit of WASP-17b using the multi-band photometer ULTRACAM on ESO's NTT in the context of performing transmission spect…