Have you considered a very dilute plume of antimatter falling into the star over a long period of time? It'd increase the energy output of the star, possibly making it even harder to detect by anyone watching. The increased output would also increase the solar wind, possibly destabilizing the orbits even sooner (although that may cause them to slow and fall in). Credit to barbecue's parasite answer for inspiration!
phelbore
- 21
- 3