Astrometric measurements of HD 143275

This opened a window of opportunity to study how the gaseous disks around Be stars respond to gravitational disturbance. We first refine the binary parameters with the best orbital phase coverage data from the Navy Precision Optical Interferometer.

Then we present the first imaging results of the disk after the periastron, based on seven nights of five telescope observations with the MIRC combiner at the CHARA array. We found that the disk was inclined 27{deg}.6+/-6{deg}.0 from the plane of the sky, had a half-light radius of 0.49mas (2.2 stellar radii), and consistently contributed 71.4%+/-2.7% of the total flux in the H band from night to night, suggesting no ongoing transfer of material into the disk during the periastron.