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If there's another planet in the system nearby, its weak gravitational influence will pull the inner world into a highly elliptical orbit. Once there, it will stretch and squeeze from tidal heating. And this happens in the icy moons of the outer solar system, which liquefies their interiors. But for a planet around a white dwarf, this will heat up so much that it becomes totally uninhabitable. The biggest research showed that this was very easy to do. Even a small deviation of perfectly circular orbit would be enough to do my planet.