Program: GN-2021B-Q-312

We are carrying out a survey of A/B type sub-arcsecond binary stars with the CHARA and VLTI arrays. Our ARMADA survey was designed for the purpose of detecting giant exoplanets on au orbits to individual stars in the binary pair. Understanding the parameters of the outer binary is crucial for maximizing the science potentaion of ARMADA. Since our targets are long-period binaries, the orbital coverage is often incomplete and poorly studied. Speckle imaging with Alopeke and Zorro on Gemini North and South can provide much needed information about our targets in short observations. Our targets are all bright, meaning that these observations are easy and can be carried out in poor weather conditions. These quick snapshots will allow us to identify any unseen additional companions to the binary system, as well as provide multi-band flux ratios of the binary to constrain spectral type. We plan to use speckle imaging to compute photometric masses of our systems, and eventually for isochrone fitting on an HR diagram of our 70 ARMADA targets. This information will also allow us to better constrain how exoplanet frequency varies with spectral type of the host star.