Abstract
Using the sample of nearby white dwarfs (WDs) compiled by Holberg et al. (2002) we intend to study the sub-stellar binarity among WDs in the solar vicinity. A smaller contrast in near infrared bands between WDs and sub-stellar objects helps us to detect thermal emission from the hottest sub-stellar objects. Observations will be carried out in Paranal. For wider pairs, an adaptive optic system provided by VLT+NACO will be used, as well as interferometry for close companions. This project is part of a PhD thesis and the data will be collected during Chilean telescope time.
