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So what’s exploding? Am I watching an alien planet get obliterated?

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No, any planets in the area were wiped clean a very long time ago.

We will see the star itself explode. In the process of these explosions, a remnant of the stellar body remains - in this case it continues to be fed off a nearby star and will restart it’s stellar lifecycle for another 80 years and do it again.

Nova aren’t strong enough to completely tear a star apart unless the star is large enough, like 200x the mass of our sun.

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