We present the discovery of a spatially unresolved source of sub-millimeter continuum emission ( \lambda = 855 \mu m ) associated with a young planet , PDS 70 c , recently detected in H \alpha emission around the 5 Myr old T Tauri star PDS 70 .
We interpret the emission as originating from a dusty circumplanetary disk with a dust mass between 2 \times 10 ^ { -3 } M _ { \Earth } and 4.2 \times 10 ^ { -3 } M _ { \Earth } .
Assuming a standard gas-to-dust ratio of 100 , the ratio between the total mass of the circumplanetary disk and the mass of the central planet would be between 10 ^ { -4 } -10 ^ { -5 } .
Furthermore , we report the discovery of another compact continuum source located 0.074 \arcsec \pm 0.013 \arcsec South-West of a second known planet in this system , PDS 70 b , that was previously detected in near-infrared images .
We speculate that the latter source might trace dust orbiting in proximity of the planet , but more sensitive observations are required to unveil its nature .