Circumplanetary disk

Circumplanetary disk around exoplanet PDS 70c (point-like source and surrounding cloud in the center of the right image; brightness indicates the hot hydrogen circumplanetary disk), within a circumstellar disk (left image)

A circumplanetary disk (or circumplanetary disc, short CPD) is a torus, pancake or ring-shaped accumulation of matter composed of gas, dust, planetesimals, asteroids or collision fragments in orbit around a planet. They are reservoirs of material out of which moons (or exomoons or subsatellites) may form. Such a disk can manifest itself in various ways.

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