A multi-wavelength study of grain growth in protoplanetary discs

This thesis presents a multi-wavelength survey of protoplanetary discs aimed at studying the first stages of planet formation by searching for signatures of grain growth up to cm-sized pebbles and disentangling the emission mechanisms present at 7 and 15 mm. It features new millimetre data for a sample of T Tauri stars. Results suggest that grain growth up to millimetre sizes and the presence of excess emission at 7 mm and beyond are common in these systems. This work demonstrates the importance of multi-wavelength and multi-epoch observations of T Tauri stars and contributes to our understanding of the mechanisms present in these systems that lead to the first stages of planet formation.