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The behaviour is listed in http://download.oracle.com/docs/cd/E23120_01/html/821-2854/operatingsolariswithldoms.html#resultsfromhaltingorrebootingcontroldomain
There is no way I can think of to trigger the guest domains to showdown automatically due some external power event (by external, I mean not initiated by the LDoms Manager). You may be able to configure domain dependencies to do what you want (see http://download.oracle.com/docs/cd/E23120_01/html/821-2854/configuredomaindependencies.html#scrolltoc) but that may have Availability implications.
Otherwise you'd have to run 'ldm stop -a' before powering down the system.
I'm not sure what would happen in the case of a Critical temperature event but I'd guess that by default, the guests would just powered off (unless domain dependencies were configured)