Categories: Planetary Formation

Planets may Start Forming Before the Star is Even Finished

Planets form from the accumulation of countless grains of dust swirling around young stars. New computer simulations have found that planets begin forming earlier than previously thought, when a planet’s star hasn’t even finished forming yet.

To make a planet you need to do a lot of gluing, going from tiny grains of dust invisible to the human eye to objects thousands of kilometers across. Prevailing theories of planetary formation assumed that this gluing process begins after a protostar had settled down, but new research is challenging that view.

Satoshi Ohashi and his collaborators at the RIKEN Star and Planet Formation Laboratory used computer simulations to study the evolution of protoplanetary disks around still-forming stars. They found that gaps appeared in the disks much earlier than expected. Those gaps are due to enough dust grains gluing together that their accumulated mass can clear out channels in the disk.

 “We found that ring structures emerged even in the early stages of disk formation,” says Ohashi. “This suggests that the dust grains may become bigger earlier than we had previously thought.”

This result is surprising because young protostars are still in a state of significant flux, with their output varying wildly. It’s not exactly the best place for dust grains to quietly glue together.

And yet, observations with the ALMA observatory have revealed gaps in young protoplanetary systems. The simulations performed by Ohashi and his colleagues have shown how those gaps could appear so quickly.

“Recent ALMA observations have found at least four ring structures in protostellar disks, which are consistent with our simulations,” notes Ohashi.

Future observations at multiple wavelengths will hopefully reveal more structures within the disks, with can help further verify the computer simulations and help researchers understand this complex, dusty process.

Paul M. Sutter

Astrophysicist, Author, Host |

Recent Posts

NASA is Going Ahead With a Hopping Lander to Explore the Lunar Surface

Methods of movement for robotic explorers of other worlds have been as varied as the…

4 hours ago

Two Bizarre red Asteroids Somehow Migrated From the Kuiper Belt all the way to the Main Asteroid Belt

If asked to pick what color asteroids in the asteroid belt would be, red is…

4 hours ago

NASA Chooses Falcon Heavy Over SLS to Launch Europa Clipper, Saving About $2 Billion

The bureaucracy of government control is slowly fading away in space exploration, at least in…

1 day ago

A Black Hole Emitted a Flare Away From us, but its Intense Gravity Redirected the Blast Back in our Direction

Using the XMM-Newton and NuSTAR X-ray telescopes, an international team of scientists were able to…

2 days ago

Lightweight Carbon Fiber Reinforced Plastic Fuel Tanks Pass a Critical Test, and Could Knock a lot of Weight off a Rocket’s dry Mass

Material science is still the unsung hero of space exploration.  Rockets are flashier, and control…

3 days ago

InSight has Mapped out the Interior of Mars, Revealing the Sizes of its Crust, Mantle, and Core

In a series of newly-published papers, NASA scientists have shown how InSight's seismic data allowed…

4 days ago