Baby Jupiter grew up really fast, thanks to a big growth spurtJanuary 6th, 2009 - 2:11 pm ICT by ANI
Washington, Jan 6 (ANI): A new study of planet formation around young stars has revealed that the planet Jupiter may have gained weight in a hurry during its infancy, since the material from which it formed probably disappeared in just a few million years.
For the study, Smithsonian astronomers examined the 5 million-year-old star cluster NGC 2362 with NASAs Spitzer Space Telescope, which can detect the signatures of actively forming planets in infrared light.
They found that all stars with the mass of the Sun or greater have lost their protoplanetary (planet-forming) disks. Only a few stars less massive than the Sun retain their protoplanetary disks.
These disks provide the raw material for forming gas giants like Jupiter. Therefore, gas giants have to form in less than 5 million years or they probably wont form at all.
Even though astronomers have detected hundreds of Jupiter-mass planets around other stars, our results suggest that such planets must form extremely fast. Whatever process is responsible for forming Jupiters has to be incredibly efficient, said lead researcher Thayne Currie of the Harvard-Smithsonian Center for Astrophysics.
Even though nearly all gas giant-forming disks in NGC 2362 have disappeared, several stars in the cluster have debris disks, which indicates that smaller rocky or icy bodies such as Earth, Mars, or Pluto may still be forming.
The Earth got going sooner, but Jupiter finished first, thanks to a big growth spurt, explained co-author Scott Kenyon.
Kenyon added that while Earth took about 20 to 30 million years to reach its final mass, Jupiter was fully grown in only 2 to 3 million years.
Previous studies indicated that protoplanetary disks disappear within 10 million years.
The new findings put even tighter constraints on the time available to create gas giant planets around stars of various masses. (ANI)
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