I'm designing an Earth-like planet that has a mass of 1.9 that of Earths' and a gravity of 1.44 g. It is orbiting around a k7v orange dwarf star at a distance of 0.47 AU and with an orbital period of 0.39 Earth years.
Now, due to a number of collisions that my planet went through during it's formation, it is permanently tidally locked, but can still support life thanks to strong wind currents that carry heat around the globe.
However, I've realized that in order for my planet to have an atmosphere capable of carrying heat effectively, it also needs to have a strong magnetic field to protect the atmosphere from the star's solar flares, something that could be difficult considering how slowly the planet needs to spin around itself in order to be tidally locked.
If we assume that the planets iron core makes up 49% of the planet's mass, will my planet be capable of maintaining a magnetosphere long enough to sustain multicellular life?