What role does the host star’s magnetic field play regarding final Hot Jupiter orbits?

It creates a magnetic barrier preventing the planet from plunging into the star

While planetary migration explains how Hot Jupiters reach close orbits, a secondary puzzle is why they do not spiral all the way into the star and become tidally disrupted or absorbed. Research suggests the host star's powerful magnetic field provides a crucial stopping mechanism. This field interacts with the surrounding material—whether residual disk gas or the planet's own evolving atmosphere—to establish a 'magnetic barrier.' This barrier functions like an effective repulsive wall or speed bump, resisting the inward pull of tidal forces and preventing the planet from completing its final plunge. This mechanism forces the planet to settle into a stable, observed orbit, often situated just outside this protective magnetic zone, thereby explaining why stable orbits exist very close to, but not directly overlapping with, the star.