We discuss two multiple star systems that host known exoplanets : HD 2638 and 30 Ari B. Adaptive optics imagery revealed an additional stellar companion to both stars .
We collected multi-epoch images of the systems with Robo-AO and the PALM-3000 adaptive optics systems at Palomar Observatory and provide relative photometry and astrometry .
The astrometry indicates that the companions share common proper motion with their respective primaries .
Both of the new companions have projected separations less than 30 AU from the exoplanet host star .
Using the projected separations to compute orbital periods of the new stellar companions , HD 2638 has a period of 130 yrs and 30 Ari B has a period of 80 years .
Previous studies have shown that the true period is most likely within a factor of three of these estimated values .
The additional component to the 30 Ari makes it the second confirmed quadruple system known to host an exoplanet .
HD 2638 hosts a hot Jupiter and the discovery of a new companion strengthens the connection between hot Jupiters and binary stars .
We place the systems on a color-magnitude diagram and derive masses for the companions which turn out to be roughly 0.5 solar mass stars .