Are there any planets not orbiting a celestial body which can support life despite the temperature? Also what is the absolute minimum temperature that life can survive in?
IHMO, I think it is possible into any planet with a hot core, that means if there is life on some of this planets they should be on the subterran part of the planet on underneath the deep freezed oceans, underground seas and caves, that means too that the life we will find on such planets will be quite shiny and probably looking like much of the animals we find at deep see here on earth.
We have not yet discovered any planets that are certainly capable of supporting life, (except Earth) and the few rogue planets that we do believe that we have found have been gas giants, no good for life.
It is unlikely that life could exist on a rogue planet. The surface of a terrestrial planet that was not in orbit around a star would be exceedingly cold, as cold as Pluto.
The only place for life to start would be in a layer of liquid water, similar to that on Enceladus. If the core were sufficiently warm, it could maintain a liquid water layer, under a thick layer of ices.
No such rogue planet is known to exist.