system
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human
What happens to the planets?

So, we now know supernovae are responsible for the dust that forms new planets. Yay for star formation. But, what happens to the planets that surround those stars? The gravity of the star changes. Do the planets change orbits? Do they get blown out of the star system? Do they get obliterated? And what about the 'Oort Cloud' around a star, assuming other stars have a similar feature?

And, what happens to the stars in the vicinity? Does gas get blown off of those stars too? Do their planets and Oort Clouds get blown away from their parent star? Would all those meteors, planets et al count towards 'dark matter'?

Inquiring minds want to know.
gpt
The energy of an supernova is huge. No, it's vast. No, it is beyond freakin comprehension.

The energy of an supernova is so high, that our humand minds can't understand it. You might have heard of an supernova having some billion times the brightness of our sun; or an total energy amount of some 10^45 Joules; but you can't really conceive what that means. 

These numbers give us a deceptive hunch that we could understand what's going on there. However, we can only calculate, not understand the actual event. 

Doing so, we start off from something at the edge of our comprehension: the 50 MT Tsar Bomb. It had a yield of 210 PJ. This is almost 2 billion times less than the energy released by the sun - in just a second. So this is rather a joke, even compared too such a small star like our sun. 

But guess what, i wouldn't make such a calculation, if it wouldn't become even more hilarious. Comparing a supernova to our sun, the released energy is 7 times higher than the energy output of our sun - over a period of 12 billion years. 

Coming back to your question, you now probably have a clue what happens to planets in such an event. Just anything in something that we would call a planetary system is wiped out. The mere heat would let entire planets simply evaporate and even if it wouldn't the shockwave would just entrain them along everything else, no matter what. 

Any kind of asteroid or comet belt is just wiped away like in a freaking science fiction movie. An potential Oort cloud is going to be part of the plasma shockwave sooner or later (rather soon). The whole remnant is growing over time and eventually becomes several lightyears wide, an area of total destruction and death. 

But wait, total destruction? Perhaps not. Stars can withstand such an explosion. It wouldn't even have to be far away: Even in a simple binary system it wouldn't be much influenced, because it has an enormous gravitational pull on it's own matter and isn't strongly disturbed by the outside heat. Most stars, except for those with extremely low densities like red giants or red supergiants would feel only little difference. 

A red supergiant in a binary system may lose its hull; yet it would keep its core and therefore not be completely destroyed. It mostly depends on how far away the star is and its density. 

The influence of other star systems depends on their distance. The shockwave would travel too slow to directly influence other star system in a short amount of time; however the radiation travels with the speed of light. The radiation is strong enough to heat up the nearest systems, futher away systems might still be influenced in some way, for example effects on the atmospheres. 

A supernova which would happen less than 25 lightyears from earth would waste our ozone layer, which would cause the sun to fry us. Orbits however aren't influenced much, because only radiation would hit us. The shockfront would hit us some thousand years later. A good example is the crab nebula, which is almost 1000 years old and about 11 lightyears wide. Even when the shockfront would hit us, woulld't recognize much, as the density has become much less than any earth made vacuum.

> Would all those meteors, planets et al count towards 'dark matter'?

Dark matter has nothing to do with baryonic matter, if i understood you right.