Do giant planets closer to its host star require a revision of the planet formation?

I mean many giant planets ( jupiter sized and larger) are found around a handful of stars. Most of them are much closer to their host star than the Earth is to the Sun. Does this require a revision of the planet formation model? WHy or why not?Do giant planets closer to its host star require a revision of the planet formation?Not necessarily. But the formation of the Solar system seems more complicated than we thought.



When the Sun is formed a disk of gas and dust is left around it, containing about 1% of the mass of the Sun. In the inner part of the disk it is warm enough so that molecules like water, ammonia and methane tend to stay as gases and not produce grains and clumps and so on. And because they stay in gas form the radiation pressure from the Sun and the solar wind will push them outwards.



Around the orbit of Jupiter it becomes cold enough for ice to form. The gaseous molecules can produce grains and lumps so there's a lot of this less dense material around to accrete into planets. It is here that gas giants grow.



But initially they grow in a dusty environment and the accretion will slow them down, so that they spiral inwards and become "hot Jupiters", which are presently the only exoplanets we can detect. Give or take a few million years... they melt, turn again into gas, which the Sun pushes outwards again.



At a next stage new giants are produced, but smaller ones as there is less and less matter available. Finally the disk is cleaned up enough to prevent the orbit slowdown to happen. And the result is the Solar system, containing only planets with a distribution that would be undetectable.Do giant planets closer to its host star require a revision of the planet formation?
It is too soon to speculate. It would certainly be a possibility.



It does offer proof that all solar systems are unique and do not always take the formation process that our own Solar System did.



Currently, only the larger exoplanets are able to be detected because they are the easiest to find due to their gravitational influence upon the host star.



It will be a few more years until we discover more and more terrestrial type planets.



Even after these smaller planets are found, the case will always hold true that the formation of our Solar System is not common or typical.



It is currently believed that the outer planets formed more quickly due to their initial content of ice. Thus they accrued a larger size than the inner planets. The discoveries to date, as you mention, would certainly question the validity of that theory.Do giant planets closer to its host star require a revision of the planet formation?It's possible that no revision will be needed. Several of the current models of planet formation indicate that gas giant planets may spiral inwards during their formation, ending up as "hot Jupiters." There is some question about this, however, since it obviously did not occur in our own solar system (if it had, the inward-moving giant planet would have disrupted the orbits of the inner planets, including Earth).Do giant planets closer to its host star require a revision of the planet formation?
http://www.nature.com/nature/journal/v43鈥?/a>



The above 2005 paper (and others by Levison, Hahn, Malhotra, Morbidelli, Gomes, Tsiganis) explains that the giant gas planets in the solar system did not form where they are now - they migrated due to angular momentum exchange with the dust and gas left over from the creation of the system. Jupiter migrated inwards, while Saturn, Uranus and Neptune migrated outwards.



Planetary migration has been studied intensively since the 2005 Nature publication, and appears to solve the problem you pose. I am particularly fond of this theory, as I wrote my Masters thesis on it in 2008.Do giant planets closer to its host star require a revision of the planet formation?Our Jupiter is just under the thresh hold to be its own star.

We are almost binary in our solared system.

Study binary systems which in number are more than a handful.