Questions tagged [proto-planetary-disk]

Questions about disks of dense gas and dust surrounding a young stellar object

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15
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1answer
525 views

Why do planets and satellites in the Solar system look so wildly different if they came from more or less the same matter?

First, the planets. We have Mercury, which is rocky, no atmosphere. But then we have Venus, which is completely different: thick atmosphere, very hot, geologically active. Then Earth - blue, full of ...
5
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1answer
221 views

Why do the solar system planets go rock==>gas==>ice instead of rock==>ice==>gas?

The sun and the solar wind seem to do a good job of fractionating lighter materials to the outer solar system and leaving heavier materials in the inner solar system. So we end up with rocky/metallic ...
4
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1answer
57 views

What color distribution does a protoplanetary disk have?

A kids question indeed, but I do not have a conclusive answer. An usual artist's impression uses red and yellow as dominating colors, and a rather homogenous, dense disk, but how reasonable is that? ...
23
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5answers
3k views

What makes protoplanetary disks start rotating? (Initial energy needed to rotate)

Planets form from a protoplanetary disk that has been rotating around its star. The initial energy that makes them rotate really matters to me. Why did the protoplanetary disk start rotating around ...
0
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1answer
215 views

Did Mercury clear its neighborhood?

For a body to qualify as a planet according to the IAU definition it must have "cleared its neighborhood". What evidence is there Mercury indeed cleared its neighborhood? Perhaps it migrated ...
5
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1answer
77 views

Composition of ice giants

After reading the paper "The Measured Compositions of Uranus and Neptune from their Formation on the CO Ice Line", I was left with doubts which I would like to clarify. Firstly, the paper proposes ...
2
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0answers
38 views

How common is it for large objects (few kilometers wide) in a young protoplanetary disk or debris disk to collide with one another?

If enough time has passed for gravitational forces to allow the formation of planetesimals(proto-planets) in orbit around the proto-star, how likely is it that two of them would collide with one ...
5
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1answer
37 views

Are warm circumstellar debris disks still able to be detected at sub-millimeter wavelengths?

At these wavelengths a survey is more sensitive to detecting relatively cool disks (T<100k), but would a telescope operating in the sub-millimeter be less sensitive to warm debris disk than say, a ...
3
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1answer
69 views

Exoplanets, Protoplanets, and planetesimals

So, most of the mass of the solar system (that isn't inside the sun) is inside Jupiter. And most of whats left after THAT is inside Saturn. So, all the rocky planets, moons, and asteroids in our solar ...
5
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1answer
192 views

Why is Earth's rotation considered fast?

I'm currently reading Atom (Krauss book), and in chapter 11 there is this text: This collision can explain many things, including the high rate of spin of the Earth (the grazing collision would ...
6
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1answer
140 views

Can a frost line exist around a protoplanet?

The Frost line is the border that marks where volatiles such as water, methane, ammonia, etc. (commonly referred to as 'ices') are able to condense into solid grains in the protoplanetary disk around ...