Catastrophically evaporating planet

A catastrophically evaporating planet or disintegrating planet is a stage in the evolution of some types of rocky planet in the final stage of their existence, as they evaporate away from high temperature caused by extreme proximity to their star and because of their low mass. From observations of exoplanets, it has been noted that disintegrating planets usually form a comet-like tail on their orbit around a star.

Source: Wikipedia — Catastrophically evaporating planet (CC BY-SA 4.0)