We construct evolutionary models of the remnant of the merger of two carbon-oxygen (CO)
core white dwarfs (WDs). With total masses in the range 1–2 M⊙, these remnants may either …

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We study the properties of double white dwarf (DWD) mergers by performing hydrodynamic
simulations using the new and improved adaptive mesh refinement code octo-tiger. We …

Abstract We use Modules for Experiments in Stellar Astrophysics (MESA) to construct stellar
evolution models that reach a hydrogen-deficient, carbon-rich giant phase like the R …

Context. Decades after their discovery, only four hydrogen-deficient carbon (HdC) stars were
known to have no circumstellar dust shell. This is in complete contrast to the∼ 130 known …

Context. It is more and more suspected that R Coronae Borealis (RCB) stars–rare hydrogen-
deficient and carbon-rich supergiant stars–are the products of mergers of CO/He white-dwarf …

We present a highly scalable demonstration of a portable asynchronous many-task
programming model and runtime system applied to a grid-based adaptive mesh refinement …

We present the results of an investigation of the dredge-up and mixing during the merger of
two white dwarfs (WDs) with different chemical compositions by conducting hydrodynamic …

ABSTRACT R Coronae Borealis stars (RCBs) are cool supergiants that display non-periodic
deep dips in brightness. Recently, a group of 'Hot RCB stars' has been discovered to be fast …

The study of extended, cold dust envelopes surrounding R Coronae Borealis (RCB) stars
began with their discovery by the Infrared Astronomical Satellite. RCB stars are carbon-rich …