Poster Abstracts

Name/Affiliation:  Johannes Sahlmann (European Space Agency)

Title:  Astrometric planet search around southern ultracool dwarfs

I will present the results obtained from the first two years of our ground-based survey of 20 nearby M8-L2 dwarfs using FORS2/VLT. The average astrometric accuracy is 150 micro-arcseconds and I will show how we use this data to determine trigonometric parallaxes with uncertainties of 0.1 mas, to discover tight ultracool binaries, and to constrain the occurrence of giant planets at intermediate separation around M8-L2 dwarfs