230 citations · 3.8k across the 83 of their papers we have counts for
83 papers
Two almost planetary mass survivors of common envelope evolution
S. G. Parsons, A. J. Brown, S. L. Casewell +19
White dwarfs are often found in close binaries with stellar or even substellar companions. It is generally thought that these compact binaries form via common envelope evolution, t…
J0526+5934: a peculiar ultra-short period double white dwarf
Alberto Rebassa-Mansergas, Mark Hollands, Steven G. Parsons +6
Ultra-short period compact binaries are important sources of gravitational waves, which include e.g. the progenitors of type Ia supernovae or the progenitors of merger episodes tha…
A rotating white dwarf shows different compositions on its opposite faces
Ilaria Caiazzo, Kevin B. Burdge, Pier-Emmanuel Tremblay +35
White dwarfs, the extremely dense remnants left behind by most stars after their death, are characterised by a mass comparable to that of the Sun compressed into the size of an Ear…
An Eclipsing 47 minute Double White Dwarf Binary at 400 pc
James Munday, P. -E. Tremblay, J. J. Hermes +20
We present the discovery of the eclipsing double white dwarf (WD) binary WDJ 022558.21-692025.38 that has an orbital period of 47.19 min. Following identification with the Transiti…
Discovery of Dipolar Chromospheres in Two White Dwarfs
J. Farihi, J. J. Hermes, S. P. Littlefair +3
This paper reports the ULTRACAM discovery of dipolar surface spots in two cool magnetic white dwarfs with Balmer emission lines, while a third system exhibits a single spot, simila…
JWST detection of heavy neutron capture elements in a compact object merger
A. Levan, B. P. Gompertz, O. S. Salafia +80
The mergers of binary compact objects such as neutron stars and black holes are of central interest to several areas of astrophysics, including as the progenitors of gamma-ray burs…
A 5.3-minute-period pulsing white dwarf in a binary detected from radio to X-rays
Ingrid Pelisoli, T. R. Marsh, David A. H. Buckley +19
White dwarf stars are the most common stellar fossils. When in binaries, they make up the dominant form of compact object binary within the Galaxy and can offer insight into differ…
Photometric follow-up of 43 new eclipsing white dwarf plus main-sequence binaries from the ZTF survey
Alex J. Brown, Steven G. Parsons, Jan van Roestel +12
Wide-field time-domain photometric sky surveys are now finding hundreds of eclipsing white dwarf plus M dwarf binaries, a population encompassing a wealth of information and potent…
Two decades of optical timing of the shortest-period binary star system HM Cancri
James Munday, T. R. Marsh, Mark Hollands +15
The shortest-period binary star system known to date, RX J0806.3+1527 (HM Cancri), has now been observed in the optical for more than two decades. Although it is thought to be a do…
The White Dwarf Binary Pathways Survey -- IX. Three long period white dwarf plus subgiant binaries
S. G. Parsons, M. S. Hernandez, O. Toloza +8
Virtually all binaries consisting of a white dwarf with a non-degenerate companion can be classified as either close post-interaction systems (with orbital periods of a few days or…
white dwarfs within 40 pc III: spectroscopic observations of new candidates in the southern hemisphere
Mairi W. O'Brien, P. -E. Tremblay, N. P. Gentile Fusillo +31
We present a spectroscopic survey of 248 white dwarf candidates within 40 pc of the Sun; of these 244 are in the southern hemisphere. Observations were performed mostly with the Ve…
The White Dwarf Binary Pathways Survey -- VIII: a post common envelope binary with a massive white dwarf and an active G-type secondary star
M. S. Hernandez, M. R. Schreiber, S. G. Parsons +6
The white dwarf binary pathways survey is dedicated to studying the origin and evolution of binaries containing a white dwarf and an intermediate-mass secondary star of the spectra…
Multi-colour optical light curves of the companion star to the millisecond pulsar PSR J2051-0827
V. S. Dhillon, M. R. Kennedy, R. P. Breton +16
We present simultaneous, multi-colour optical light curves of the companion star to the black-widow pulsar PSR J2051-0827, obtained approximately 10 years apart using ULTRACAM and…
Long-term photometric monitoring and spectroscopy of the white dwarf pulsar AR Scorpii
Ingrid Pelisoli, T. R. Marsh, S. G. Parsons +14
AR Scorpii (AR Sco) is the only radio-pulsing white dwarf known to date. It shows a broad-band spectrum extending from radio to X-rays whose luminosity cannot be explained by therm…
Circular Polarimetry of Suspect Wind-accreting Magnetic pre-Polars
Pasi Hakala, Steven G. Parsons, Thomas R. Marsh +4
We present results from a circular polarimetric survey of candidate detached magnetic white dwarf - M dwarf binaries obtained using the Nordic Optical Telescope, La Palma. We obtai…
Magnetic dynamos in white dwarfs -III: explaining the occurrence of strong magnetic fields in close double white dwarfs
Matthias. R. Schreiber, Diogo Belloni, Monica Zorotovic +3
The origin of strong magnetic fields in white dwarfs has been a puzzle for decades. Recently, a dynamo mechanism operating in rapidly rotating and crystallizing white dwarfs has be…
Characterising eclipsing white dwarf M dwarf binaries from multi-band eclipse photometry
Alex J. Brown, Steven G. Parsons, Stuart P. Littlefair +10
With the prevalence of wide-field, time-domain photometric sky surveys, the number of eclipsing white dwarf systems being discovered is increasing dramatically. An efficient method…
The White Dwarf Binary Pathways Survey VII: Evidence for a bi-modal distribution of post mass transfer systems?
F. Lagos, M. R. Schreiber, S. G. Parsons +5
Binary systems consisting of a white dwarf and a main-sequence companion with orbital periods up to d are often thought to be formed through common envelope evolution…
The White Dwarf Binary Pathways Survey VI: two close post common envelope binaries with TESS light curves
M. S. Hernandez, M. R. Schreiber, S. G. Parsons +9
Establishing a large sample of post common envelope binaries (PCEBs) that consist of a white dwarf plus an intermediate mass companion star of spectral type AFGK, offers the potent…
To be or not to be a black hole: detailed binary population models as a sanity check
H. F. Stevance, S. G. Parsons, J. J. Eldridge
We use the self-consistent stellar populations in the Binary Population A Spectral Synthesis (BPASS) models to assess whether NGC1850-BH1 is a black hole. Using search criteria bas…
The post-common-envelope binary central star of the planetary nebula Ou 5: a doubly-eclipsing post-red-giant-branch system
David Jones, James Munday, Romano Corradi +10
We present a detailed study of the stellar and orbital parameters of the post-common envelope binary central star of the planetary nebula Ou~5. Low-resolution spectra obtained duri…
Uncovering the chemical structure of the pulsating low-mass white dwarf SDSS J115219.99+024814.4
A. D. Romero, G. R. Lauffer, A. G. Istrate +1
Pulsating low-mass white dwarf stars are white dwarfs with stellar masses between 0.30~M and 0.45~M that show photometric variability due to gravity-mode pulsat…
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…
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…