How did Jupiter and Saturn disrupt our solar system

[wolram]

This article suggests that exoplanets are the same size and have equal orbital spacing ,so what is different from our solar system.
https://www.sciencedaily.com/releases/2018/01/180109141918.htm

An international research team led by Université de Montréal astrophysicist Lauren Weiss has discovered that exoplanets orbiting the same star tend to have similar sizes and a regular orbital spacing. This pattern, revealed by new W. M. Keck Observatory observations of planetary systems discovered by the Kepler Telescope, could suggest that most planetary systems have a different formation history than the solar system.

 

[phyzguy]

The disruption caused by Jupiter and Saturn getting into a 2:1 resonance is described by the Nice model.

 

[wolram]

Thanks physguy, a second question, why are the exoplanets all relatively the same size and in stable orbits?

 

[phyzguy]

Thanks physguy, a second question, why are the exoplanets all relatively the same size and in stable orbits?

I have no idea.

 

[Nik_2213]

Observational bias ?

Doppler detection is biased towards finding 'hot Jupiters', and 'transit' method is restricted to the ~ 10% of systems with orbital plane serendipitously aligned...

Okay, as Doppler sensitivity continues to improve, more, smaller and/or further planets show up as-is or in the 'residuals'. Although 'transit' sensitivity improves, too, a progressively smaller percentage are sufficiently planar to flag outer planets...

Early days, yet !

FWIW, long ago, I read an early report on solar system formation simulations in Icarus. The results were a bit embarrassing as *none* came out looking like ours. Instead, a zoo. Large close, small far, wild mix common etc etc. With hindsight, they'd done better than they knew...

 

[stefan r]

This article suggests that exoplanets are the same size and have equal orbital spacing ,so what is different from our solar system.
https://www.sciencedaily.com/releases/2018/01/180109141918.htm

An international research team led by Université de Montréal astrophysicist Lauren Weiss has discovered that exoplanets orbiting the same star tend to have similar sizes and a regular orbital spacing. This pattern, revealed by new W. M. Keck Observatory observations of planetary systems discovered by the Kepler Telescope, could suggest that most planetary systems have a different formation history than the solar system.

arxive article
My impression from your article was that they were saying the solar system pattern is normal. What they do not find is something like Venus-Jupiter-Earth-Saturn. Systems with alternating giants small planets.

Earth and Venus have very similar size. Kepler would have only seen the 4 inner planets. The ratios follow the general statistical pattern of larger planet outside of smaller. There are 3 ratios and Mars/Earth is the only one with smaller planet outside. So 67% of our inner planets follow the pattern unless you take earth/venus as rounded to equal in which case the solar system is 50%.

When planets in a real system are not the same size, the inner planet is usually the smaller planet (in 65±6%of pairs)

The rocky planets of trappist 1 have similar size range as Mercury, Venus, Earth, Mars:
b = 0.79±0.27 M⊕
c= 1.63±0.63 M⊕
d= 0.33±0.15 M⊕
e= 0.24+0.56−0.24 M⊕
f = 0.36±0.12 M⊕
g = 0.566±0.038 M⊕
h = 0.086±0.084 M⊕

The spacing of the inner solar system is also very close to 1.5. Except for venus/mercury.

 

[wolram]

Thank you Nik1223 and stephan r for your elucidation.