Saturn does have a magnetic field - one of the reasons that Titan can keep its atmosphere is because it (mostly) orbits outside it.
Jupiter is nowhere near massive enough to heat its satellites (beyond a few millions years after its formation). But even superjovians and brown dwarfs won't cut it - they cool too quickly. Massive brown dwarfs might stay warm enough for a couple of billion years but after that any moon in its habitable zone would freeze.
Jupiter is nowhere near massive enough to heat its satellites (beyond a few millions years after its formation). But even superjovians and brown dwarfs won't cut it - they cool too quickly. Massive brown dwarfs might stay warm enough for a couple of billion years but after that any moon in its habitable zone would freeze.