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The sensitivity of radial velocity (RV) surveys for exoplanet detection areextending to increasingly long orbital periods, where companions with periodsof several years are now being regularly discovered. Companions with orbitalperiods that exceed the duration of the survey manifest in the data as anincomplete orbit or linear trend, a feature that can either present as the soledetectable companion to the host star, or as an additional signal overlain onthe signatures of previously discovered companion(s). A diagnostic that canconfirm or constrain scenarios in which the trend is caused by an unseenstellar, rather than planetary, companion is the use of high-contrast imagingobservations. Here, we present RV data from the Anglo-Australian Planet Search(AAPS) for twenty stars that show evidence of orbiting companions. Of these,six companions have resolved orbits, with three that lie in the planetaryregime. Two of these (HD~92987b and HD~221420b) are new discoveries. Follow-upobservations using the Differential Speckle Survey Instrument (DSSI) on theGemini South telescope revealed that five of the twenty monitored companionsare likely stellar in nature. We use the sensitivity of the AAPS and DSSI datato place constraints on the mass of the companions for the remaining systems.Our analysis shows that a planetary-mass companion provides the most likelyself-consistent explanation of the data for many of the remaining systems.

Detection of Planetary and Stellar Companions to Neighboring Stars via a Combination of Radial Velocity and Direct Imaging Techniques