You have two issues: AA-1 and BB-1 and AA-1 depends on BB-1.
Is there an automatic way to notify AA-1 watchers that BB-1 was solved?
Code. Example: https://studio.plugins.atlassian.com/wiki/display/GRV/Built-In+Scripts#Built-InScripts-Updateblockingissues
This will add a comment to issues linked when the issue is resolved. Adding the comment sends a notification.
Code.
The reason is simple structurally - the act of "solving" BB-1 has absolutely no impact on AA-1. They do have a relationship, but are separate issues technically, and there's nothing linking the things happening on BB-1 to AA1
I would write a listener myself - listen to all the "solve" events in the relevant projects and when one happens, scan the solved issue for the links you're looking for. Then send your own email.
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Other than writing code, as Nic mentioned, an option would be to subscribe filters. The filter would have to be written to find dependent links of issues that were resolved in the last X amount of time.
JQL Tricks plugin (paid) has a linkedIssuesInQuery method which can look for specific link types and queries like the above. Might help!
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