Continuum Excess Emission in Young Low Mass Stars

The amount of excess emission in the near-infrared spectrum of classical T Tauri stars (CTTS) is higher than predicted by current models. This lack of understanding about the CTTS systems impinges directly on our ability to achieve a deeper knowledge of the final stages of low mass stars formation, of the pre-main sequence history of the Sun and even on the processes that lead to planet formation. Here I present a portion of the Unsolved Universe of the CTTS systems and some Challenges for the Future in this field.