A team of researchers led by Avi Shporer recently discovered the existence of two Jupiter-sized planets entitled EPIC 211418729b and EPIC 211442297b. Researchers declared the planets as “warm” due to the fact their surface temperatures are 719 K and 682 K. Although these temperatures appear hot they are not typical of what is normally described as a “hot Jupiter” which can reach temperatures of a couple thousand Kelvin. Another characteristic of “hot Jupiters” are short orbital periods, but both planets exhibit some of the longest orbital periods of close orbiting gas giants that have been discovered. Even though these traits are peculiar they are not as strange as the fact that they do not possess inflation in their atmosphere. Due to the heavy, gaseous atmospheres and proximity to their host star, “hot Jupiters” exhibit an inflation in their radii. Both “warm Jupiters” do not show indicators of inflation in their radii and follow the trend of what researchers model for normal gas giants with their calculated mass. The team speculates from this finding that there is a possibility that the radiation from host stars does not directly affect the radius of “warm Jupiters.” Future research will be conducted on these exoplanets with K2 from May to August of 2018.
A link to the article summarizing the research can be found here.
A link to the full study which depicts the characteristics of these “warm Jupiters” can be found here.