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We present high-resolution speckle interferometric imaging observations ofTESS exoplanet host stars using the NN-EXPLORE NESSI instrument the at the3.5-m WIYN telescope. Eight TOIs, that were originally discovered by Kepler,were previously observed using the Differential Speckle Survey Instrument(DSSI). Speckle observations of 186 TESS stars were carried out and 45 (24%)likely bound companions were detected. This is approximately the number ofcompanions we would expect to observe given the established 46% binarity ratein exoplanet host stars. For the detected binaries, the distribution of stellarmass ratio is consistent with that of the standard Raghavan distribution andmay show a decrease in high-q systems as the binary separation increases. Thedistribution of binary orbital periods, however, is not consistent with thestandard Ragahavan model and our observations support the premise thatexoplanet-hosting stars with binary companions have, in general, wider orbitalseparations than field binaries. We find that exoplanet-hosting binary starsystems show a distribution peaking near 100 au, higher than the 40-50 au peakthat is observed for field binaries. This fact led to earlier suggestions thatplanet formation is suppressed in close binaries.

Speckle Observations of TESS Exoplanet Host Stars: Understanding the Binary Exoplanet Host Star Orbital Period Distribution