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Dusty shock waves generate planet ingredients

The finding suggests the same kinds of shock waves that cause sonic booms from speeding jets are responsible for creating the stuff of planets throughout the universe.
Provided by the Jet Propulsion Laboratory, Pasadena, California
Quartz-like crystals
Quartz-like crystals found in planetary disks.
NASA/JPL-Caltech
November 12, 2008
Shock waves around dusty, young stars might be creating the raw materials for planets, according to new observations from NASA's Spitzer Space Telescope.

The evidence comes in the form of tiny crystals. Spitzer detected crystals similar in make-up to quartz around young stars just beginning to form planets. The crystals, called cristobalite and tridymite, are known to reside in comets, in volcanic lava flows on Earth, and in some meteorites that land on Earth.

Astronomers already knew that crystallized dust grains stick together to form larger particles that later lump together to form planets. But they were surprised to find cristobalite and tridymite. These particular crystals require flash heating events, such as shock waves, to form.

"By studying these other star systems, we can learn about the very beginnings of our own planets 4.6 billion years ago," said William Forrest of the University of Rochester, New York. "Spitzer has given us a better idea of how the raw materials of planets are produced very early on." Forrest and University of Rochester graduate student Ben Sargent led the research.

Planets are born out of swirling pancake-like disks of dust and gas that surround young stars. They start out as mere grains of dust swimming around in a disk of gas and dust, before lumping together to form full-fledged planets. During the early stages of planet development, the dust grains crystallize and adhere together, while the disk itself starts to settle and flatten. This occurs in the first millions of years of a star's life.

When Forrest and his colleagues used Spitzer to examine five young planet-forming disks about 400 light-years away, they detected the signature of silica crystals. Silica is made of silicon and oxygen, and it is the main ingredient in glass. When melted and crystallized, it can make the large hexagonal quartz crystals often sold as mystical tokens. When heated to even higher temperatures, it also can form small crystals like those commonly found around volcanoes.

It is this high-temperature form of silica crystals, specifically cristobalite and tridymite, that Forrest's team found in planet-forming disks around other stars for the first time. "Cristobalite and tridymite are essentially high-temperature forms of quartz," said Sargent. "If you heat quartz crystals, you'll get these compounds."

In fact, the crystals require temperatures as high as 1,740° Fahrenheit (949° Celsius) to form. But young planet-forming disks are only about -280° to 1,340° Fahrenheit
(-173° to 727° Celsius) — too cold to make the crystals. Because the crystals require heating followed by rapid cooling to form, astronomers theorized that shock waves could be the cause.

Some theorists think shock waves, or supersonic waves of pressure, are created in planet-forming disks when clouds of gas swirling around at high speeds collide. They think that shock waves might also accompany the formation of giant planets.

Local evidence from our own solar system supports these findings. Scientists also think spherical pebbles, called chondrules, found in ancient meteorites that fell to Earth were crystallized by shock waves in our solar system's young planet-forming disk. In addition, NASA's Stardust mission found tridymite minerals in Comet Wild 2.
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