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We used the Magellan adaptive optics (MagAO) system and its VisAO CCD camerato image the young low mass brown dwarf companion CT Chamaeleontis B for thefirst time at visible wavelengths. We detect it at r', i', z', and Ys. With ournew photometry and Teff~2500 K derived from the shape its K-band spectrum, wefind that CT Cha B has Av = 3.4+/-1.1 mag, and a mass of 14-24 Mj according tothe DUSTY evolutionary tracks and its 1-5 Myr age. The overluminosity of our r'detection indicates that the companion has significant Halpha emission and amass accretion rate ~6*10^-10 Msun/yr, similar to some substellar companions.Proper motion analysis shows that another point source within 2" of CT Cha A isnot physical. This paper demonstrates how visible wavelength AO photometry (r',i', z', Ys) allows for a better estimate of extinction, luminosity, and massaccretion rate of young substellar companions.

New Extinction and Mass Estimates from Optical Photometry of the Very Low Mass Brown Dwarf Companion CT Chamaeleontis B with the Magellan AO System