The 1.3 days number is the orbital period -- how long it takes the planet to go around the star. Planets with short orbital periods are close to the star. If a

The 1.3 days number is the orbital period -- how long it takes the planet to go around the star. Planets with short orbital periods are close to the star. If a planet is close enough to the parent star, the gravity of the star is strong enough to lock the rotation of the planet such that one side is always facing the star.