Poster Abstracts

Name/Affiliation:  Ya-Lin Wu (University of Arizona)

Title:  Optical Photometry of CT Chamaeleontis B with Magellan AO System

We used the Magellan adaptive optics system (MagAO) to image the young brown dwarf companion CT Chamaeleontis B at visible wavelengths. We detected it at i', z', and Ys, but not at r', indicating that it has no significant accretion. With our new optical photometry, we are able to better estimate the extinction and the companion's mass and size. Finally, the astrometry also rules out the possibility that CT Cha has a second companion.