No it is indeed an artists impression of the planet - it’s on the wiki page.

I’m assuming that aurora only needs solar wind to happen on earth - or that solar wind outside the heliosphere is strong enough you don’t need a star for it to happen.

In 2018 astronomers said "Detecting SIMP J01365663+0933473 with the VLA through its auroral radio emission, also means that we may have a new way of detecting exoplanets, including the elusive rogue ones not orbiting a parent star …