Circumstellar disk

Definition

A circumstellar disk is a flat, rotating disk of gas and dust surrounding a newly formed star. It is the region where planets, asteroids, and other celestial bodies can form.

5 Must Know Facts For Your Next Test

1. Circumstellar disks are often sites of planet formation through the process of accretion.
2. They typically exist around young stars for about 10 million years before dissipating.
3. The composition of a circumstellar disk includes hydrogen, helium, and heavier elements like carbon and silicon.
4. Observations of circumstellar disks can be made in various wavelengths such as infrared and radio due to their thermal emissions.
5. Our solar system's planets are believed to have formed from a circumstellar disk known as the protoplanetary disk.

Review Questions

• What role do circumstellar disks play in planetary formation?
• How long do circumstellar disks typically exist around young stars?
• What types of elements are commonly found in circumstellar disks?

Related terms

Protoplanetary Disk: A type of circumstellar disk specifically around young stars where planets are forming.

Accretion: The process by which particles in a circumstellar disk collide and stick together to form larger bodies.

Debris Disk: A type of circumstellar disk made up mostly of dust and debris, often found around older stars.