Parallels: Proto-Planetary Disks and rings 30 November 2015.
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Transcript of Parallels: Proto-Planetary Disks and rings 30 November 2015.
![Page 1: Parallels: Proto-Planetary Disks and rings 30 November 2015.](https://reader038.fdocuments.in/reader038/viewer/2022100505/5a4d1b4f7f8b9ab0599a7166/html5/thumbnails/1.jpg)
Parallels: Proto-Planetary Disks and rings
30 November 2015
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Origin of the Solar System
• It’s a fundamental problem in astronomy• We must explain the characteristics of our own
system, and of planets around other stars• Elements were made inside stars• Stars formed from giant molecular clouds• Planets form in a disk around the protostar• Giant planets form from accretion onto cores• Terrestrial planets are only the cores
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Characteristics of our Solar System
• Regular planet orbits• Planets are closely spaced• Terrestrial and Jovian planets• Asteroids and comets leftover• Satellites and rings imitate a miniature Solar
System
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Stages in planet formation• Dust collects in the mid-plane of the
protoplanetary disk• Grows by mutual collisions: ‘accretion’• Planetesimals (about 1km across) grow and collide• Giant collisions are the final stage• Giant planet cores are bigger outside the frost-line:
they attract gas to become gas giants like Jupiter• Star ignites: the gas and dust blown away
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Leftovers
• Near the Sun (inside frost-line, also known as snow line or ice line) rocky objects become asteroids
• Far from the Sun (outside frost-line) icy objects form the comets and Kuiper Belt Objects
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Density waves andpropellers in a forming disk
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