The leading theory is that hot Jupiters tend to occur in single planet systems, but Szabo et al. find evidence that some hot Jupiters might reside in multi-planet systems. Are hot Jupiters actually lonely?
“Characterizing atmospheres beyond the Solar System is an endeavor no longer confined to the realm of science fiction.”
Is it a comet or a planet?
Many Super-Earths appear to be less dense than the Earth. How do such planets form? Could a rocky Super-Earth accrete a hydrogen-helium atmosphere in-situ?
Sarah Dodson-Robinson identifies a correlation between planetary radius and stellar metallicity among gas giants in the Kepler catalog that may indicate a change in the structure and formation mechanism of planets over cosmic time.
Kepler mission extended to 2016.