So, I'm about to start a new worldbuilding project for a fantasy world, but I want to try to make the basic world at least somewhat plausible; the magic in the setting is going to be pretty low-key, and I don't wanna use it to handwave physics away.
Basically I'm wondering if my basic idea for the setting is scientifically plausible, since I've no science background myself and mostly just dreamt this up after watching some astronomy documentaries.
The idea is to have a double planet system where at least one planet is basically Earth's size and composition - I'd like the other to be as well, but if it has to be slightly off for this to work that's okay. I'd like them to be tidally locked to each other, and to orbit a Sun-like star in its habitable zone if that's at all possible. Lastly, I'd like them to have an orbital period of 1 day, so the day and the "month" are equally long.
Would this work at all, or would they collide or rip each other apart or something? Also curious in what ways a dual planet system like this would differ from the Earth-Moon system in terms of tides, geology, et cetera? I've gotten the idea that tidally locked worlds don't exert much tidal forces on each other, but I'm really unsure how that all works. Would there be no tides, or would there still be tides like on earth, or maybe even a lot stronger for some reason I don't grasp?
Anyway, if anyone has anything helpful or informative to say about this it would be wildly appreciated. Cheers!