Abstract
Recently, dust disks like the zodiacal dust cloud in our own solar system have commonly been detected around young main-sequence stars. Dust particles in the disks spiral into the central star within short time scales compared to the duration of the disks due to a drag force as a consequence of the interaction with stellar radiation, which is known as the (electromagnetic) Poynting-Robertson effect. Therefore, the presence of planetesimals that replenish the dust has been inferred in the debris disks. We will show that the electromagnetic Poynting-Robertson effect is weaker than the particulate Poynting-Robertson effect caused by the interaction with stellar winds around young stars because of their stronger winds than the winds around older stars. As a result, the particulate Poynting-Robertson effect plays an important role in determining the lifetimes of dust particles in the debris disks around young stars.
