Astronomers snap a picture of a head-scratching planet in a triple-star system

From Astronomy Magazine
HD 131399Ab is relatively young and farther from its parent star than any confirmed planet in our solar system.

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The image of the HD 131399 system, with primary star A toward the top, the planet in the middle, and stars B and C in the lower right. The images were taken by the SPHERE instrument at ESO’s Very Large Telescope. ESO/K. Wagner et al.

There are plenty of weird planets in the Milky Way, but HD 131399Ab may be one of the weirdest.

Discovered in a survey of 100 young stars, the 16 million-year-old planet still glows hot enough for astronomers to image it directly. Somehow in those short few million years, it migrated out 80 astronomical units (AU; one AU is the average Earth-Sun distance) from its parent star.

But also accompanying the parent star, which is a little bit bigger than the Sun, are two companion stars in orbit around each other at a distance of 300 to 400 AU.

“In this case, this planet is much closer to the other stars in the system than any known exoplanets in a multi-star system,” says Kevin Robert Wagner, a graduate student at the University of Arizona and lead author of the discovery paper, published today in Science.

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