In the 4 years of Kepler’s primary mission, the star showed an unprecedented dimming of 3.5 percent. So not only did Kepler detect transient dips in brightness of up to 20 percent, there also seems to be a very definite downward trend in brightness throughout our observational history of the star.
No matter how you slice it, this is strange.
After studying photometric observations for other stars surrounding KIC 8462852, there’s no other star that shows such dramatic behavior. What’s more, there’s very few known phenomena that could be causing this. So once again, astronomers are clutching at straws in an effort to explain what is going on.
“Broadly speaking, the morphology of the light curve is generally consistent with the transit of a cloud of optically thick material orbiting the star,” Monet and Simon write in their paper. “The breakup of a small body or a recent collision that could produce a cloud of material could also plausibly produce a family of comets that transit the host star together as one group, explaining the light curve…”