These are artist’s impressions of the exoplanet HD209458b showing material streaming off this superheated gas giant. This is how it was reported on the BBC website. I think this is the study here that detected the material streaming off this planet in a way that resembled a tail.
And here are some very different ways of looking at this system.
This one is looking at the gravitational interaction between the star HD209458 and its planet, it came from here.
And this image is a model of the material streaming off HD209458b which came from here.