The White Dwarf Binary Pathways Survey IV: Three close white dwarf binaries with G-type secondary stars

Abstract

Constraints from surveys of post common envelope binaries (PCEBs) consisting of a white dwarf plus an M-dwarf companion have led to significant progress in our understanding of the formation of close white dwarf binary stars with low-mass companions. The white dwarf binary pathways project aims at extending these previous surveys to larger secondary masses, i.e. secondary stars of spectral type AFGK. Here we present the discovery and observational characterization of three PCEBs with G-type secondary stars and orbital periods between 1.2 and 2.5 days. Using our own tools as well as MESA we estimate the evolutionary history of the binary stars and predict their future. We find a large range of possible evolutionary histories for all three systems and identify no indications for differences in common envelope evolution compared to PCEBs with lower mass secondary stars. Despite their similarities in orbital period and secondary spectral type, we estimate that the future of the three systems are very different: TYC 4962-1205-1 is a progenitor of a cataclysmic variable system with an evolved donor star, TYC 4700-815-1 will run into dynamically unstable mass transfer that will cause the two stars to merge, and TYC 1380-957-1 may appear as super soft source before becoming a rather typical cataclysmic variable star.

Accepted for publication in MNRAS, 13 pages, 9 figures, 5 tables

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Cited by in corpus (6)

• White dwarf-main sequence binaries from Gaia EDR3: the unresolved 100pc volume-limited sample
• Close detached white dwarf + brown dwarf binaries: further evidence for low values of the common envelope efficiency
• A Catalogue of Potential Post Common Envelope Binaries
• The White Dwarf Binary Pathways Survey VI: two close post common envelope binaries with TESS light curves
• The White Dwarf Binary Pathways Survey VII: Evidence for a bi-modal distribution of post mass transfer systems?
• Magnetic dynamos in white dwarfs -III: explaining the occurrence of strong magnetic fields in close double white dwarfs