[LINK] "Jupiter May Have Killed Solar System's Baby Super-Earths"

[rfmcdonald]

Discovery News was one of the multiple news sites reporting on a recent study suggesting that our solar system looks the way it does, with no super-Earths, because of the baleful presence of Jupiter.

“In our solar system planets are pretty widely spread out and there’s literally nothing inside of Mercury’s orbit,” astronomer Gregory Laughlin, with the University of California Santa Cruz, told Discovery News.

“The fact that the default mode of planet formation ... is leading to configurations that are totally unlike our own solar system is something I found really curious. The main feature of our solar system is that the inner part is just missing,” he said.

Enter the “Grand Tack” theory of our solar system’s formation, which suggests that in its infancy, giant Jupiter spiraled inward, swept by the gravitational wake of its own buildup. Like a cosmic bull in a celestial china shop, Jupiter’s gravity would have flung asteroids and proto-planets every which way, creating a shooting arcade that could have easily destroyed planets in the region, Laughlin said.

The story would have ended there were it not for Saturn, which evolved somewhat later and ended up with enough gravitational muscle to counteract Jupiter’s inward spiral, freeing the giant planet to shift back beyond Mars, or so the Grand Tack theory holds.

That left the inner solar system clear for a second-generation of planets to form, Earth among them.

Laughlin and colleagues were less interested in proving Jupiter’s navigational prowess than looking at what impacts the migration could have had.