Magnetic Fields and Planets of T Tauri Stars

T-Tauri stars are late-type pre-main-sequence stars that are gravitationally contracting towards the main sequence. Magnetic fields largely dictate the angular momentum evolution of these stars and can affect the formation and migration of planets. Thus, characterizing their magnetic fields is critical for testing and developing stellar dynamo models, and theories of low-mass star and planet formation. I present the results so far of the MaTYSSE project, that aims to map the magnetic fields of these stars, and detect close-in giant planets.