This exoplanet is located in a star system about 300 light years away from us.  Here is some of the evidence which led astronomers to this theory:

New images from the NASA/ESA Hubble Space Telescope and the Gemini Planet Imager (GPI) of this system show that the star has a lopsided comet belt indicative of a very disturbed system, and hinting that planet interactions that roiled the comets closer to the star might have sent the exoplanet into exile as well.

 

The disturbance could have been caused by a passing star that perturbed the inner planets, or a second massive planet in the system.

Interesting…this tells us a lot about Pluto and our own Jupiter, and potentially all gas giants in that some may have formed differently than others.

thanks to sci-news.com for the great info

thanks to NASA for the pic

thanks to  Paul Kalas / University of California, Berkeley for the pic