Is the average solar system formation, rocky planets in the inner orbits and gaseous planets towards the outer orbits ?

That isn’t “average” for the planetary systems discovered so far.

>The Solar System consists of an inner region of small rocky planets and outer region of large gas giants. However, other planetary systems can have quite different architectures. Studies suggest that architectures of planetary systems are dependent on the conditions of their initial formation. Many systems with a hot Jupiter gas giant very close to the star have been found. Theories, such as planetary migration or scattering, have been proposed for the formation of large planets close to their parent stars. At present, few systems have been found to be analogous to the Solar System with terrestrial planets close to the parent star. More commonly, systems consisting of multiple Super-Earths have been detected.

https://en.wikipedia.org/wiki/Planetary_system#Planets

Bubblecar said:

That isn’t “average” for the planetary systems discovered so far.

>The Solar System consists of an inner region of small rocky planets and outer region of large gas giants. However, other planetary systems can have quite different architectures. Studies suggest that architectures of planetary systems are dependent on the conditions of their initial formation. Many systems with a hot Jupiter gas giant very close to the star have been found. Theories, such as planetary migration or scattering, have been proposed for the formation of large planets close to their parent stars. At present, few systems have been found to be analogous to the Solar System with terrestrial planets close to the parent star. More commonly, systems consisting of multiple Super-Earths have been detected.

https://en.wikipedia.org/wiki/Planetary_system#Planets

It will be interesting to see what the combined exoplanet formation behavior averages out to be.

Tau.Neutrino said:

Is the average solar system formation, rocky planets in the inner orbits and gaseous planets towards the outer orbits ?

Yes. There is something called an “ice line”. Closer in to the Sun from that and all the volatiles evaporate away to give a rocky planet. Further out and the volatiles are retained giving icy and gaseous planets. Of course, rocky planets can have gaseous atmospheres.

This has the intrinsic assumption that planets formed by cold accretion, as happened in our solar system.

But extrasolar hot Jupiters didn’t form by cold accretion. They are all failed stars, which means that they don’t have to be rocky.

The other uncertainty for extrasolar planets is that about half of them are in highly elliptical orbits. And because nobody has yet calculated how elliptical the orbits of extrasolar planets with atmosperes actually are, any published results relating orbital distance to atmosphere for extrasolar planets is subject to a huge amount of uncertainty.