Density Waves and Migrating Planets 3 December 2014.

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Density Waves and Migrating Planets 3 December 2014

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Transcript of Density Waves and Migrating Planets 3 December 2014.

Page 1: Density Waves and Migrating Planets 3 December 2014.

Density Waves and Migrating Planets

3 December 2014

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Star forming region in Giant Molecular Clouds

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Proto-Planetardisks

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HubbleViews of Proplyds

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Comet and asteroid collisions

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Propeller Structures

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Protoplanets form, opening gaps

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Inside the nebula

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PropellersAgain!

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Summary

• Protoplanets in the protoplanetary disk resemble moons embedded in rings

• They open gaps and raise density waves• Type 1 migration: waves transport momentum:

as the planet loses momentum, it spirals in• Type 2 migration: a gap forms and the moon is

dragged in along with the disk• When the star turns on, it blows away the disk,

leaving the planet behind as a ‘hot Jupiter’


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