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Extrapolating from the solar system's asteroid belt, we propose thatexternally-contaminated white dwarfs without an infrared excess may beexperiencing continuous accretion of gas-phase material that ultimately isderived from the tidal destruction of multiple small asteroids. If thisscenario is correct, then observations of metal-polluted white dwarfs may leadto determining the bulk elemental compositions of ensembles of extrasolar minorplanets.

Pollution of single white dwarfs by accretion of many small asteroids