Another example of planetary resonance has been discovered thanks to NASA’s Kepler space telescope.
Located about 1,100 light years away, Kepler-80, named for the NASA telescope that discovered it, features five small planets orbiting in extreme proximity to their star.
As early as 2012, Kepler scientists found that all five planets orbit in an area about 150 times smaller than the Earth’s orbit around the Sun, with “years” of about one, three, four, seven and nine days.
The planets’ close proximity to each other and their star allowed the Kepler Space Telescope to detect tiny variations (about 0.001 percent) in the length of their “years” due to their mutual gravitational interactions. Analysis revealed that the outer four planets had masses about four- to six-times that of Earth, though they shared Earth’s rocky composition.
All four planets have masses similar to one another, though the two outermost planets are almost twice as big. This was attributed to a very puffy hydrogen/helium atmosphere. These properties are not uncommon for exoplanets, but having precise compositional estimates for multiple planets in the same planetary system is rare.
Another rare attribute of the Kepler-80 system is that its planets have “synchronized” orbits. “The outer four planets return to almost exactly the same configuration every 27 days,” said a researcher. This effect is known as a “resonance” and helps the system remain gravitationally stable.
The study also explained the origin of the synchronized orbits in general – and possibly the tightly-spaced configuration. In a process called migration, the orbits of these planets shrank over time while they were forming. Simulations clearly showed that this migration effect caused the planets to lock into synchronized orbits just like those seen with Kepler-80.
Kepler has discovered hundreds of other STIPs [Systems with Tightly-spaced Inner Planets], which consist of three to seven relatively small and closely packed planets that complete orbits in 1 to 100 days. This new form of planetary system, quite different from our own solar system, is changing the way scientists think about how planets form, including the Earth.
With all the knowledge gained by the analysis of Kepler-80, this system is granting important insight into how STIPs formed.