hot Jupiter(redirected from Ultra-short period planets)
An extrasolar gas giant planet having a mass that is equal to or greater than that of Jupiter and a high surface temperature resulting from a very close orbit with its star.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.