Anisotropic Ionizing Illumination from an M-type Pre-main-sequence Star, DM Tau
The powerful, high-energy magnetic activities of young stars play important roles in the magnetohydrodynamics in the innermost parts of the protoplanetary disks.In addition, the associated UV and X-ray emission dictates the photochemistry; moreover, the corona activities can affect the atmosphere of a newborn extrasolar planet.How the UV and X-ray