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Context. The interaction between low-mass companions and the debris discsthey reside in is still not fully understood. A debris disc can evolve due toself-stirring, a process in which planetesimals can excite their neighbours tothe point of destructive collisions. In addition, the presence of a companioncould further stir the disc (companion-stirring). Additional information isnecessary to understand this fundamental step in the formation and evolution ofa planetary system, and at the moment of writing only a handful of systems areknown where a companion and a debris disc have both been detected and studiedat the same time.  Aims. Our primary goal is to augment the sample of these systems and tounderstand the relative importance between self-stirring andcompanion-stirring.  Methods. In the course of the VLT/NaCo Imaging Survey for Planets aroundYoung stars (ISPY), we observed HD 193571, an A0 debris disc hosting star at adistance of 68 pc with an age between 60 and 170 Myr. We obtained two sets ofobservations in L' band and a third epoch in H band using the GPI instrument atGemini-South.  Results. A companion was detected in all three epochs at a projectedseparation of 11 au (0.17 arcsec), and co-motion was confirmed through propermotion analysis. Given the inferred disc size of 120 au, the companion appearsto reside within the gap between the host star and the disc. Comparison betweenthe L' and H band magnitude and evolutionary tracks suggests a mass of 0.31 -0.39 solar masses .  Conclusions. We discovered a previously unknown M-dwarf companion around HD193571, making it the third low-mass stellar object discovered within a debrisdisc. A comparison to self- and companion-stirring models suggests that thecompanion is likely responsible for the stirring of the disc.

ISPY -- NaCo Imaging Survey for Planets around Young stars. Discovery of an M dwarf in the gap between HD 193571 and its debris ring