Speckle Imaging Characterization of Radial Velocity Exoplanet Systems

Abstract We conducted speckle imaging observations of 53 stellar systems that were members long-term radial velocity (RV) monitoring campaigns and exhibited substantial accelerations indicative planetary or companions in wide orbits. Our made with blue red filters using the Differential Speckle Survey Instrument at Gemini-South NN-Explore Exoplanet Stellar Imager WIYN telescope. The identifies eight luminous within 2? primary stars. In three these systems—HD 1388, HD 87359, 104304—the properties imaged companion are consistent RV measurements, suggesting may be associated cause variation. For all systems, we derive differential magnitude limits (i.e., contrast curves) from imaging. extend this analysis to include upper on mass without detections. 25 rule out masses greater than 0.2 M ? , observed signals caused by late-M dwarfs substellar (potentially planetary) objects. On other hand, joint almost entirely rules explanations signal for 19522 suggests must have an angular separation below a few tenths arcsecond. This work highlights importance combined characterizing outer regions nearby systems.