Is it possible to make a stable planetary system like this, and what would the orbits have to be?

I have a K-type star (0.5 stellar masses) as the central body, and the planets are as follows (those I want to be in the habitable zone in bold):

I: An uninhabitable rocky inner planet 50% the mass of Mercury. Way too hot for life but not enough for automated equipment and bases. Tidally locked.

II: Then further away just on the inner edge of the habitable zone, a hot tidally locked planet that redistributes some of its heat through its atmosphere and has a huge pangea like desert continent facing the star. Life similar to that on a primitive Earth can persist here but flowers most around the terminator line. About 75% Earth mass.

III: A planet about 25% more massive than Mars. Not tidally locked to the star, as with other planets beyond this point. Has an exotic atmosphere with primitive intelligent adapted to the environment. A generally temperate climate with many more island land masses than on Earth.

IV: Almost the twin of Earth, with 90% of its mass. Intelligent space faring life.

V: A super-Earth around 30% more massive than Earth. Shallow oceans with long thin continents snaking across the planet. Intelligent and aggressive space faring life.

VI: Another Earth like planet very similar to planet IV. The species on this planet consider planet IV to be their twin world, and they are often in alliances with IV against the super-Earth in the middle orbit. On the edge of the habitable zone, so cooler than the proceeding planets but kept warmer by its atmosphere.

VII: A gas giant around the mass of Jupiter. Beyond the conventional habitable zone and out of the way of disturbing the other planets but not so far out that effects like atmosphere and tidal heating can't give its moons enough energy to have liquid water. It has two habitable moons each a little larger than Mars among with much smaller rocky moons. These two moons tidally pull on each other a little creating liveable conditions for primitive life, but probably not stable in the long run.

VIIb: The gas giant has an asteroid field co-orbiting in one of the lagrange points and in the other an ice ball around 75% of Earth with a very small rocky moon. Planet is typically around as cold as Antarctica across the planet, with a greenhouse effect from a relatively thick atmosphere keeping it from being any colder.

... So that's the setup I'm looking at. I have the important information about the masses of the planets, but is it plausible to have this system be stable for a long time, allowing for the distance of the gas giant to accommodate not disturbing the other planets that would be in some strict orbital resonance with each other?

posted almost 5 years ago

Axion‭

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