In order to carefully study the planets and moons of the target system, the Icarus would need to explore several deceleration options, which may allow the spacecraft to at least spend more time in the target system, if not fully decelerate.
We essentially have two alternatives. We can either decelerate the entire Icarus spacecraft mainly using reverse main engine thrust, or we can decelerate the individual probes using a combination of magsails, solar sails and perhaps nuclear rockets. This task is complicated by the fact that we would need to first survey the target solar system and acquire reliable orbital information for the planets or moons of interest.
What are then the requirements for maximizing the scientific data return from the probes, and what demands does this place on the probe propulsion systems?
Planetary Science Probes
Let's assume full deceleration at the target star has been achieved and planetary orbit information has been processed and assigned to a number of science probes.
By that time, near-Earth telescopes would be sufficiently advanced to verify and inform the Icarus computers on which scientific objectives are most desirable. As might be expected, there will be an incredible amount of "feature creep" at this stage, where scientists will be arguing over which objectives should take priority over others, while the probe power and propulsion systems last.