Program: GN-2013B-Q-13

In previous surveys of young stellar regions a number of substellar companions have been discovered with mass ratios as low as ~0.01, and separations up to several hundreds AU. These objects (some of which have masses near and below 15Mjup) may represent the bottom end of the stellar companion mass function or the top end of the planet population, though both scenarios pose challenges to conventional formation models. Motivated by these issues, we started an ALTAIR/NIRI survey of the Taurus star-forming region in 2011B (GN-2011B-Q-82), that was completed in 2012B (GN-2012B-Q61). Here we propose to follow-up the 26 lowest mass candidate companions we detected in our first epoch observations, to test for common proper-motion. These observations will finalize the survey, potentially leading to the discovery of some of the widest, youngest and lowest-mass planetary systems ever imaged directly, thus providing key insight to the formation ad early evolution of planets.