Abstract
Given the frequency of stellar multiplicity in the solar neighborhood, it is
important to study the impacts this can have on exoplanet properties and
orbital dynamics. There have been numerous imaging survey projects established
to detect possible low-mass stellar companions to exoplanet host stars. Here we
provide the results from a systematic speckle imaging survey of known exoplanet
host stars. In total, 71 stars were observed at 692~nm and 880~nm bands using
the Differential Speckle Survey Instrument (DSSI) at the Gemini-North
Observatory. Our results show that all but 2 of the stars included in this
sample have no evidence of stellar companions with luminosities down to the
detection and projected separation limits of our instrumentation. The
mass-luminosity relationship is used to estimate the maximum mass a stellar
companion can have without being detected. These results are used to discuss
the potential for further radial velocity follow-up and interpretation of
companion signals.
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