The definition of planet includes “orbiting a star.” So this is not a planet, and it’s not rogue.
Is it under the gravitational field of a star, or a large planet? Define “drifting” in a planetary context, and not in an ocean context.
Correct those errors and resubmit your paper.
Probably was orbiting a star at one time. Then got "kicked out" of it star system by some gravitational disturbance, perhaps a passing star. Can't see how a planet could form outside a star system, but I suppose it's possible. In nature, it seems damn near anything is possible.
That’s what I was thinking.