In the exoplanetary era, the Kepler spacecraft is causing a revolution by discovering thousands of new planet candidates. However, a follow-up program is needed to reject false candidates and fully characterize the bona-fide exoplanets. Our main aims are to 1./ detect and analyze close companions inside the typical Kepler point spread function (PSF) to study whether they are the responsible for the dimming found in Kepler light curves, 2./ study the change in the stellar and planetary parameters caused by an unresolved object, 3./ help validate the Kepler objects of interest (KOI) that do not have any object inside the Kepler PSF, and 4./ study the multiplicity rate of planet-host candidates. Such a large sample of observed planet-host candidates allows us to derive statistics for close (visual or bounded) companions to the harboring star.

Cone search capability for table J/A+A/546/A10/table3 (Estimated spectral types for objects with i-z>0.21)

Cone search capability for table J/A+A/546/A10/table4 (Observing information of the 41 non-isolated objects in our sample)

Cone search capability for table J/A+A/546/A10/table7 (Spectral-energy-distribution fitting results for the medium-distance companions with 2MASS counterparts)