Evaporatus-1

Evaporatus-1
Evaporatus-1 is a small star system that has two main features: evaporating atmospheres, and asteroid belts. It is around 540 million years old.

Star-
Evaporatus A is a young G4 type star.

Planets-

 * Evaporatus b- At 0.22 AU from its star, this world is very hot. One of the smallest worlds, it is only 1.3x the size of Earth. Though it has an atmosphere, it is rapidly evaporating away due to heat. Because its Hill sphere is relatively small, the asteroid belt it has around it lies close to its surface, the farthest ones being located at around 20,000 miles from its surface. The closest ones reside in Evaporatus b's diluted atmosphere, so Evaporatus b gets quite a bit of meteor showers and asteroid impacts. Most of the other asteroids have spread out along its orbit, with the inner edge at 0.19 AU and the outer 0.25 AU.
 * Evaporatus c- A large Super-Earth with a mass 4.2 times that of Earth, it lies around 1.3 AU from its star. The asteroid belt it once sat in is now mostly cleared, with the remaining asteroids orbiting in a long, thick belt around Evaporatus c. Low equatorial orbit would be dangerous due to the asteroids, which shed large amounts of dust. The dust belt slowly steals momentum from the asteroids, causing them to fall closer and closer to the planet. Eventually the asteroids start brushing the atmosphere, which rapidly slows them down. However, some asteroids reach a stable orbit before that: the exosphere clears out the dust, and if the asteroid doesn't have a lot of downward momentum, then it can remain in a small area where the exosphere's atmospheric drag is minimal but enough to clear out dust.