F LagosM R SchreiberS G ParsonsA ZurloD MesaB T GänsickeR BrahmC CaceresH CanovasM-S HernandezA JordanD KoesterL SchmidtobreickC TappertZorotovic, MónicaMónicaZorotovic2025-04-142025-04-142020-03-1610.1093/mnras/staa7472-s2.0-85085380088https://cris-uv-2.scimago.es/handle/123456789/2363WOS:000535885900070ABSTRACT The White Dwarf Binary Pathways Survey aims at increasing the number of known detached A, F, G, and K main-sequence stars in close orbits with white dwarf companions (WD+AFGK binaries) to refine our understanding about compact binary evolution and the nature of Supernova Ia progenitors. These close WD+AFGK binary stars are expected to form through common envelope evolution, in which tidal forces tend to circularize the orbit. However, some of the identified WD+AFGK binary candidates show eccentric orbits, indicating that these systems are either formed through a different mechanism or perhaps they are not close WD+AFGK binaries. We observed one of these eccentric WD+AFGK binaries with SPHERE and find that the system TYC 7218-934-1 is in fact a triple system where the WD is a distant companion. The inner binary likely consists of the G-type star plus an unseen low-mass companion in an eccentric orbit. Based on this finding, we estimate the fraction of triple systems that could contaminate the WD+AFGK sample. We find that less than 15 per cent of our targets with orbital periods shorter than 100 d might be hierarchical triples.enacceso abiertoAstronomy And AstrophysicsSpace And Planetary Sciencereview