It's posited that this planet kept its atmosphere despite intense solar radiation pressure because it either moved into this orbit recently from a safer place, or it had much more atmosphere to begin with. I wonder if maybe it just has a very powerful magnetic field that protects it, just like Earth's does.
That's the reason Earth has kept its atmosphere while Mars did not, despite the fact that Mars is twice as far from the sun.
That's the reason Earth has kept its atmosphere while Mars did not, despite the fact that Mars is twice as far from the sun.