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 structures as a way to better understand the physical properties of known planets and possibly uncover new ones.
When the mass of gas is roughly equal to the mass of dust, the two interact in a way that leads to clumping in the dust and the formation of patterns. Effectively, the gas shepherds the dust into the kinds of structures astronomers would expect to see if a planet were present.
Lyra and Kuchner refer to this as the photoelectric instability and developed a simulation to explore its effects. This animation shows how the process alters the density of dust in a debris disk and rapidly leads to the formation of rings, arcs and oval structures.", "items": [], "extra_data": {} }, { "id": 343759, "url": "https://svs.gsfc.nasa.gov/11302/#media_group_343759", "widget": "Video player", "title": "", "caption": "", "description": "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)
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But is there another explanation? A new simulation performed on NASA's Discover supercomputing cluster shows how the dust and gas in the disk could form those patterns no planets needed.Credit: NASA's Goddard Space Flight CenterMusic: \"Hyperborea\" from Killer Tracks.Watch this video on the NASA Goddard YouTube channel.Complete transcript available.", "width": 1024, "height": 576, "pixels": 589824 } }, { "id": 10635, "url": "https://svs.gsfc.nasa.gov/10635/", "page_type": "Produced Video", "title": "Dust Simulations Paint Alien's View of the Solar System", "description": "Dust ground off icy bodies in the Kuiper Belt, the cold-storage zone that includes Pluto and millions of other objects, creates a faint infrared disk potentially visible to alien astronomers looking for planets around the sun. Neptune's gravitational imprint on the dust is always detectable in new simulations of how this dust moves through the solar system. By ramping up the collision rate, the simulations show how the distant view of the solar system might have changed over its history. More here. || ", "release_date": "2010-09-23T09:00:00-04:00", "update_date": "2023-05-03T13:54:03.704440-04:00", "main_image": { "id": 490596, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a010600/a010635/Kuiper.jpg", "filename": "Kuiper.jpg", "media_type": "Image", "alt_text": "Short video about the Kuiper Belt and the new supercomputer model of its evolution.For complete transcript, click here.", "width": 1280, "height": 720, "pixels": 921600 } } ], "sources": [], "products": [], "newer_versions": [], "older_versions": [], "alternate_versions": [] }