[DannyTN]

"If one of these exoplanets is revolving around a star which goes nova, does the exoplanet become an ex-planet?"

Depends on whether the planet survives. Google says a planet orbiting Betelguise will lose at least 4km of it's surface, vaporized to space. Good chance it will be an ex-planet.

But if it survives, and is no longer orbiting a remnant star, then it's a "rogue" planet. Filled with beautiful women with white streaks in their hair and able to drain your powers and life force with a single touch.

[Jamestown1630]

'If one of these exoplanets is revolving around a star which goes nova, does the exoplanet become an ex-planet?'

It becomes exodebris.

(Damn; I missed the Perseids...)