Dust traps create a crescent-shaped planet-forming disk around young star HD 163296

Star system: HD 163296 | Distance from the Sun: 331 light years

High-resolution images from the ALMA telescope have revealed a variety of shapes in the dust of planet-forming disks, including rings, spirals, and crescents. While most disks show symmetrical rings, some display asymmetric features like blobs or crescents, which may be linked to vortices or the influence of forming planets. This study focuses on the disk around the star HD 163296, where a crescent-shaped arc was observed in the dust using ALMA data at four different wavelengths.

The researchers analyzed the arc’s structure and found a matching signature in the motion of gas at the same location. Their results suggest that the crescent is caused by dust being trapped in a local pressure maximum, which could be created by a vortex or by a planet’s gravitational influence at a special point in its orbit. These findings help explain how dust can gather in certain regions of a disk, potentially leading to the formation of new planets.

Key findings
- ALMA images show a crescent-shaped dust structure in the disk around HD 163296
- The crescent coincides with a kinematic signature in the gas, indicating a link between dust and gas motion
- The structure is likely caused by dust trapping in a local pressure maximum
- Possible mechanisms include a vortex or trapping at a Lagrangian point due to a planet
- These features may play a key role in planet formation by concentrating dust

Scientific study

Dust traps and gas kinematic signatures in a crescent structure of a planet-forming disk (external link)