5 papers
An eclipsing CEMP candidate discovered in a search for dwarf carbon stars in post-common envelope binaries
Jonathan A. G. McLennan, Jay Farihi, Steven G. Parsons
Dwarf carbon stars are dominated by members of the Galactic halo and are thus likely carbon-enhanced metal-poor stars. In this work, 879 bona fide dwarf carbon stars are characteri…
ZTF J021804.16+071152.93: a dead cataclysmic variable and potential solution to the missing period bouncers
S. G. Parsons, A. J. Brown, S. L. Casewell +22
It is predicted that half or more of all cataclysmic variables (CVs) should have evolved past the period minimum and now exist as so-called "period bouncers" where a white dwarf sh…
Long-term eclipse time variations in white dwarf binaries
Amalie Yates, S. G. Parsons, A. J. Brown +15
The overwhelming majority of eclipsing white dwarf (WD) binary systems show quasi-periodic variations in eclipse timings on many year timescales. Currently, the mechanism behind th…
Most extremely low mass white dwarfs with non-degenerate companions are inner binaries of hierarchical triples
Felipe Lagos-Vilches, Mercedes Hernandez, Matthias R. Schreiber +2
Extremely-low-mass white dwarfs (ELM WDs) with non-degenerate companions are believed to originate from solar-type main-sequence binaries undergoing stable Roche lobe overflow mass…
Novel Constraints on Companions to the Helix Nebula Central Star
Leyla Iskandarli, Jay Farihi, Joshua D. Lothringer +3
The Helix is a visually striking and the nearest planetary nebula, yet any companions responsible for its asymmetric morphology have yet to be identified. In 2020, low-amplitude ph…