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This Weird Star System Is Flipping Awesome

14 Jan 2019, 22:35 UTC
This Weird Star System Is Flipping Awesome
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The binary system observed by ALMA isn’t wonky, it’s the first example of a polar protoplanetary disk

Artwork of the system HD 98000. This is a binary star comprising two sun-like components, surrounded by a thick disk of material. What’s different about this system is that the plane of the stars’ orbits is inclined at almost 90 degrees to the plane of the disk. Here is a view from the surface of an imagined planet orbiting in the inner edge of the disk [University of Warwick/Mark Garlick].

Some star systems simply don’t like conforming to cosmic norms. Take HD 98000, for example: It’s a binary system consisting of two sun-like stars and it also sports a beautiful protoplanetary disk of gas and dust. So far, so good; sounds pretty “normal” to me. But that’s only part of the story.

When a star is born, it will form a disk of dust and gas — basically the leftovers of the molecular cloud the star itself formed in — creating an environment in which planets can accrete and evolve. Around a single star (like our solar system) the protoplanetary disk is fairly well behaved and will create a relatively flat disk around ...

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