Inner Disk Structure and Transport Mechanisms in the Transitional Disk around T

To better understand how Earthlike planets form around lowmass stars, wepropose to study the UV (HST), Xray (XMM), and optical (LCOGT) variability ofthe young star T Cha. Changing sight lines through the disk allow measurement ofthe temperature and column density, and the physical properties of the dustgrains, as well as determining the gastodust ratio. Three 5 orbit visits,separated by 37 days, are required for use of analysis techniques comprisingboth differential pairmethod comparison of spectra with differing A_v anddetailed spectral fitting of gas absorption features at each epoch. The innerdisk of T Cha allows study of the gas and dust structure in the terrestrialplanet formation zone during this important rapid phase of protoplanetary disk evolution. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]