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The idea of a planet 1.5x the size of Jupiter, but 1/7th the mass...is very unintuitive from a gravitational perspective. Maybe it's spinning so ungodly fast that centrifugal forces are keeping it puffed out?

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I wonder if it's physically possible to start with a situation that you're describing and end up with a toroidal planet.

Yes and no. It's possible, but it's not a stable configuration, so it's unlikely to form naturally.

https://www.aleph.se/andart/archives/2014/02/torusearth.html

I thought there wasn't such thing as a "centrifugal force" :-|

In an inertial frame of reference there is not. In a rotating frame of reference there funny forces like centrifugal and a Coriolis force.

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