John,
Since you said it is fantasy, I think you can do whatever you want. Great writing will suck the reader in, and as long as your descriptions don't get super technical, your readers will be fine.
But since I like this kind of thing, I wanted to share that I am of the opinion that we just don't know much about how planetary systems work. Science is inherently arrogant about where it stands at any moment in time. And then a new discovery comes along which changes everything, and all the models are re-written.
For example, I believe we will eventually find systems with binary stars, even perhaps complex quad star systems (like Mintaka), where life is possible under certain circumstances. What those circumstances are, we just don't know yet. The universe is a very big place.
Just my two cents.
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