Astronomers Discover Bizarre Exoplanet That Behaves Like Elusive Planet Nine

Astronomers have yet to find Planet Nine, a hypothetical planet in the outer region of the solar system. According to some scientists’ calculations, this hypothetical planet could have a mass of about 10 times that of Earth and an elongated orbit 20 times farther from the sun on average than Neptune.

In a new study published in The Astronomical Journal, researchers outline novel information about an exoplanet, known as HD 106906 b, that appears to behave similarly to the elusive Planet Nine. 

Although HD 106906 b was first discovered in 2013 using the Magellan Telescopes at the Las Campanas Observatory in Chile’s Atacama Desert, astronomers only recently discovered information about the planet’s orbit using the Hubble Space Telescope, which was launched into low Earth orbit in 1990. The recent study reveals that HD 106906 b is 336 light-years from Earth and orbits around a pair of host stars. The exoplanet is also massive, with a size 11 times that of Jupiter.

Astronomers were also surprised to learn that the exoplanet has an elongated and inclined orbit, which is unlike any of the other known planets in our solar system.

Researchers believe that the exoplanet may have formed close to its host stars. However, drag over time caused the exoplanet’s orbit to decay, which caused it to “migrate inward” toward the stars. 

“The gravitational forces from the whirling twin stars then kicked it out onto an eccentric orbit that almost threw it out of the system and into the void of interstellar space. Then a star passed very close by to this system, stabilizing the exoplanet’s orbit and preventing it from leaving its home system,” the Hubble Space Telescope news release explains.

This same theory may also be used to explain what caused the hypothetical Planet Nine to be pushed to the outskirts of the solar system. The planet could have been formed in the inner solar system before being pushed out by interactions with Jupiter. Because interactions with Jupiter may have pushed Planet Nine far beyond Pluto, the prevailing theory is that passing stars may have stabilized the orbit of Planet Nine by moving its orbital path away from Jupiter and the solar system’s other planets.

Astronomers plan to further study HD 106906 b to learn more about how it was formed.

“Despite the lack of detection of Planet Nine to date, the orbit of the planet can be inferred based on its effect on the various objects in the outer solar system,” study co-author Robert De Rosa noted. “This suggests that if a planet was indeed responsible for what we observe in the orbits of trans-Neptunian objects it should have an eccentric orbit inclined relative to the plane of the solar system. This prediction of the orbit of Planet Nine is similar to what we are seeing with HD 106906 b.”


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