ultra-hot jupiter

== English == === Alternative forms === ultra hot jupiter, ultrahot jupiter, ultra-hot Jupiter, ultra hot Jupiter, ultrahot Jupiter === Etymology === Blend of ultrahot +‎ hot jupiter. From being a type of gas giant planet much hotter than most jupiter-class planets. === Noun === ultra-hot jupiter (plural ultra-hot jupiters) A giant planet, of similar mass to that of Jupiter, which orbits close enough to its sun to become tidally locked, and whose day-side atmosphere has therefore heated up so much, as to break apart most molecules, leaving atomic gas. The day-side atmosphere has the temperature and spectral characteristics of a star's surface. ==== Hypernyms ==== jovian jupiter jovian planet jupiter-class planet gas giant planet giant planet gas giant giant planet ==== Related terms ==== hot jupiter / hot Jupiter jupiter / Jupiter