In DepthAstronomy

Paired stars sculpt nebulae into fanciful shapes

See allHide authors and affiliations

Science  23 Sep 2016:
Vol. 353, Issue 6306, pp. 1351
DOI: 10.1126/science.353.6306.1351

You are currently viewing the summary.

View Full Text

Log in to view the full text

Log in through your institution

Log in through your institution

Summary

For decades, astronomers have suspected that planetary nebulae—dazzlingly colorful shrouds of gas cast off by dying stars—owe their weird but often symmetrical shapes to the sculpting magnetic forces of two stars orbiting each other at the nebula's center. Now, a study has helped confirm theorists' picture that many nebulae are the handiwork of binary stars in which the companions orbit each other so closely that they share the same atmosphere. There are more than a thousand known planetary nebulae, and few have the simple, spherical shape that would be expected from a solitary star expelling its outer layers in dying gasps. Instead, they often look like hourglasses or butterflies. The new study identifies eight star systems where the orbital axis for a binary pair lines up with the long axis of symmetry for the nebula—suggesting that theorists were right all along.