Of all the kinds of planets we’re finding around other stars—hot Jupiters and mini-Neptunes and those dubiously called “Earth-like”—super-Earths orbiting close to their stars are among the most abundant. While planets so close to their stars are poor candidates for habitability, they are important to understanding the possibility of other habitable planets in these seemingly common systems.
A new hypothesis posits that the ice giant planets formed between the CO and N2 icelines in the Solar System’s protoplanetary disk.
A new model explains Mercury’s major density with magnetism.
A new model simulates the composition of growing planetesimals in an evolving protoplanetary disk. The model predicts that carbon-rich terrestrial planets can form more easily than previously thought.
Planets in the Solar System with a higher mass spin faster than lower-mass planets. But what about planets in other systems? The authors of this paper make the first measurement of an exoplanet’s spin to compare its spin and mass to Solar System planets.
How do giant planets affect the water content of rocky planets in habitable zones? Astronomers have run new planet formation simulations to try to answer this question.
The formation of water ice is an important first step in the formation of our Solar System. We review the process of early water ice formation and the difference between crystalline and amorphous water ice.
Finding circumstellar disks in the Wide-Field Infrared Survey Explorer data is a tough job, but fortunately our brains are even better suited to the task than computers! You can help by lending your pattern-recognition skills to Disk Detective, the Zooniverse’s newest citizen science project.
How do so many hot jupiters come to orbit backwards?
Planetary radius is found to depend strongly on planet composition. The observed planet radius distribution can be recast as a composition distribution, with implications for the way planets form.