Tides on a double planet

I am making a world to be the setting of my future fantasy works, which is to say I really have no story planned but I want to have a world for it when I do and I want said world to be likely give me story ideas.

I want to make things look different but be functionally similar to earth's own circumstances for the purposes that I like science and just because magic is a thing doesn't mean that it is a thing I want to use to hand wave physics. As such I have done a lot of math to determine how this system would work.

As of now the system is a binary star system made up of a main sequence star with a mass of about .5 solar masses and a radius of .8 that of the sun's, and a white dwarf with the mass of .5 solar masses and a radius of 10,000 km. The surface temperatures of both is such that their total luminosity is equal to that of the sun's.

The planet on which my stories will take place is on a double planet, with two planets slightly larger than that of Earth that orbit around the stars while orbiting around a central point between the two of them. This is where my question comes in: how big would the tides be if the distance between them is about 3 times that of the distance between the earth and the moon so about 981,540 km apart from each other.

I am having a hard time of finding any math about that so I could just calculate it myself. Also these planets are not old enough to be tidally locked yet, and the orbit around their common center of gravity is about 28 days (cause even numbers are my friend).

To restate my question: How large would the difference between low tide and high tide on this planet be?

posted almost 7 years ago

Adrienne‭

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