What's the Name of That Book??? discussion

This topic is about
Rescue Party
SOLVED: Adult Fiction
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SOLVED. Adult Sci-Fi story. An exploration space ship arrives at the empty planet with traces of XX century civilization that is about to get destroyed; team investigates and finds out that every person has left on board of a rapidly-made spaceship. [s]
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Yes, that is it! Thanks a lot Sue, you've made my day!
The genre is a sci-fi (story or a pretty short novel). In my memory it feels like it was written by a major sci-fi author.
The plot goes like that: an exploration space ship comes to check on a planet that is about to experience a major disaster (I guess it was Supernova explosion). They find out that the planet was populated until very recently, and the whole population just vanished at once. The team comes down to one of the government bunkers and is stuck there so a spaceship gun orbiting the planet needs to be used to clear the way out. The evacuation proceeds in the last moments before supernova explodes. Later, when the spaceship is travelling back they meet a huge generation-ship of the destroyed planet natives, which have left a bit in advance to avoid disaster.
Thanks a lot for your help.