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We started a survey with CHARA/MIRC-X and VLTI/GRAVITY to search for low masscompanions orbiting individual components of intermediate mass binary systems.With the incredible precision of these instruments, we can detect astrometric"wobbles" from companions down to a few tens of micro-arcseconds. This allowsus to detect any previously unseen triple systems in our list of binaries. Wepresent the orbits of 12 companions around early F to B-type binaries, 9 ofwhich are new detections and 3 of which are first astrometric detections ofknown RV companions. The masses of these newly detected components range from0.45-1.3 solar masses. Our orbits constrain these systems to a high astrometricprecision, with median residuals to the orbital fit of 20-50 micro-arcsecondsin most cases. For 7 of these systems we include newly obtained radial velocitydata, which help us to identify the system configuration and to solve formasses of individual components in some cases. Although additional RVmeasurements are needed to break degeneracy in the mutual inclination, we findthat the majority of these inner triples are not well-aligned with the widebinary orbit. This hints that higher mass triples are more misaligned comparedto solar and lower mass triples, though a thorough study of survey biases isneeded. We show that the ARMADA survey is extremely successful at uncoveringpreviously unseen companions in binaries. This method will be used in upcomingpapers to constrain companion demographics in intermediate mass binary systemsdown to the planetary mass regime.

ARMADA II: Further Detections of Inner Companions to Intermediate Mass Binaries with Micro-Arcsecond Astrometry at CHARA and VLTI