A circumstellar disk associated with a massive protostellar object

Article Abstract:

A number of disks are discovered around low and intermediate-mass young steller objects, and the presence of disks around massive young stellar objects is uncertain. To clear that a near-infrared imaging polarimetry that reveals an outflow/disk system around the Becklin-Neugebauer protostellar object, which has a mass of at least seven solar masses, is presented.

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Low-temperature crystallization of silicate dust in circumstellar disks

Article Abstract:

Observations of highly crystalline silicate dust in the disks around binary red-giant stars are reported. The temperatures in the disks are too low for the grains to anneal and some low-temperature process must therefore be responsible. The results indicated that low-temperature crystallization of silicate grains can occur in protoplanetary systems.

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Rapid planetesimal formation in turbulent circumstellar disks

Article Abstract:

The boulders can undergo efficient gravitational collapse in locally overdense regions in the midplane of the disk. Gravitational collapse has happened much faster than radial drift, thus offering a possible path to planetesimal formation in accreting circumstellar disks.

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