Disks Don't Need Planets to Make Patterns

[Waspie_Dwarf]

NASA Study Shows Disks Don't Need Planets to Make Patterns

Many young stars known to host planets also possess disks containing dust and icy grains, particles produced by collisions among asteroids and comets also orbiting the star. These debris disks often show sharply defined rings or spiral patterns, features that could signal the presence of orbiting planets. Astronomers study the disk features as a way to better understand the physical properties of known planets and possibly uncover new ones.

But a new study by NASA scientists sounds a cautionary note in interpreting rings and spiral arms as signposts for new planets. Thanks to interactions between gas and dust, a debris disk may, under the right conditions, produce narrow rings on its own, no planets needed.

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[Waspie_Dwarf]

Debris Disks Make Patterns Without Planets

Watch the changing dust density and the growth of structure in this simulated debris disk. Dust quickly collects into clumps and then forms arcs and rings, structures similar to what astronomers observe in actual debris disks. As the dust heats the gas, the gas pressure increases and changes the drag force experienced by the dust. This essentially herds the dust into clumps that grow into larger patterns. The panel at left shows the disk from an angle of 24 degrees; at right, the disk is face-on. Lighter colors indicate higher dust density. For clarity, the animation does not show light from the central star. The disk extends about 100 times the average distance between Earth and the sun (100 AU, or 9.3 billion miles), which is comparable to the outer edge of our solar system's Kuiper Belt.

Credit: NASA Goddard/W. Lyra (JPL-Caltech), M. Kuchner (Goddard)

Source: NASA Goddard - Multimedia

[shrooma]

can't watch animations waspie, so thanks for the commentary on the action!