I was under the impression that Delta Vega was in the same system as Vulcan...
It just can't be. The Enterprise left the Vulcan system at warp, there's the scene of the crew discussing what they'll do next, and someone needs to drag Kirk to an escape pod. At the speeds the new Trek ships travel at, the Enterprise would have been lightyears from Vulcan. Not to mention that Delta Vega's orbit would be ruined if it were really that close. Or that, again, Scotty might have wanted to ask what had happened.