Planets Forming Inside vs. Outside the Ice Line

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SUMMARY

Rocky planets typically form closer to a star, while gas giants form further away due to the composition of materials available in these regions. The "Ice Line" is a critical boundary around a proto-star where ice can condense, allowing for the formation of heavier, gaseous planets outside this line. The discovery of "Hot Jupiters," "Hot Neptunes," and "Super-Earths" has challenged previous assumptions about planet formation, indicating that planets can migrate inwards or outwards from their original positions around the proto-star.

PREREQUISITES
  • Understanding of the "Ice Line" concept in planetary formation
  • Familiarity with exoplanet types such as "Hot Jupiters" and "Super-Earths"
  • Basic knowledge of stellar formation and proto-stars
  • Awareness of planetary migration theories
NEXT STEPS
  • Research the "Ice Line" and its implications for planetary composition
  • Study the mechanisms of planetary migration in protoplanetary disks
  • Explore the characteristics and formation processes of "Hot Jupiters" and "Super-Earths"
  • Investigate observational techniques for detecting terrestrial planets around other stars
USEFUL FOR

Astronomers, astrophysicists, and students interested in planetary formation and migration, as well as anyone studying exoplanetary systems and their characteristics.

KevinMWHM
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Is it common for rocky planets to form closer to a star and gas planets further?

Why or why not is this?
 
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KevinMWHM said:
Is it common for rocky planets to form closer to a star and gas planets further?

Why or why not is this?

Well I don't know how many terrestrial planets have been found around other stars... as far as I know there haven't been any. Reason being is that they are too close to the star and fairly small to be directly observed.

The reason they form closer to the star is simply because they are made out of heavier materials
 
KevinMWHM said:
Is it common for rocky planets to form closer to a star and gas planets further?

Why or why not is this?

Before the discovery of "Hot Jupiters", "Hot Neptunes" and "Super-Earths" people expected the rocky planets to form inside the "Ice Line" and gaseous/icy planets to form outside of it. The "Ice Line" is the distance around the proto-star at which ice can condense from gaseous into solid form, and it means a lot more material - commonly called "ices" - becomes trapped by the proto-planets and thus they form heavier than the rocky planets.

Since then we've learned that kinds of planets can form in one place then migrate inwards or outwards from the proto-star. Many of the known exoplanets seem to have migrated from beyond the Ice Line.
 

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