How many suns are in the sky? A SPHERE multiplicity survey of exoplanet host stars

We are studying the influence of stellar multiplicity on exoplanet systems, in particular systems that have been detected via radial-velocity searches. interested closest companions as they would a strong evolution original planet forming disks. In this study we present new during our ongoing survey hosts with VLT/SPHERE. using extreme adaptive optics imager SPHERE at ESO/VLT to search for faint (sub)stellar companions. utilized classical coronagraphic imaging mode perform snapshot (3-6 min integration time) host stars Ks-band. HD1666, HIP68468, HIP107773, and HD109271. With an angular separation only 0.38" (40 au projected separation) HIP107773 is among found stars. The presence companion explains linear trend seen system. At such small likely had significant disk around primary star. find HD1666 system may well be responsible high orbit eccentricity (0.63) Jupiter class planet, making one few where connection can established. A cross-match Gaia DR2 catalog showed furthermore near infrared HD109271 optical significantly brighter than it white dwarf companion.