Bipolar rings from jet-inflated bubbles around evolved binary stars

Muhammad Akashi, Noam Soker

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We show that a fast wind that expands into a bipolar nebula composed of two opposite jetinflated bubbles can form a pair of bipolar rings around giant stars. Our model assumes three mass-loss episodes: a spherical slow and dense shell, two opposite jets, and a spherical fast wind. We use the FLASH hydrodynamical code in three-dimensions to simulate the flow, and obtain the structure of the nebula. We assume that the jets are launched from an accretion disc around a stellar companion to the giant star. The accretion disc is assumed to be formed when the primary giant star and the secondary star suffer a strong interaction accompanied by a rapid mass transfer process from the primary to the secondary star, mainly a main-sequence star. Later in the evolution the primary star is assumed to shrink and blow a fast tenuous wind that interacts with the dense gas on the surface of the bipolar structure. We assume that the dense mass-loss episode before the jets are launched is spherically symmetric. Our results might be applicable to some planetary nebulae, and further emphasize the large variety of morphological features that can be formed by jets. But we could not reproduce some of the properties of the outer rings of SN 1987A. It seems that some objects, like SN 1987A, require a pre-jets mass-loss episode with a mass concentration at mid-latitudes.

Original languageEnglish
Article numberstw1683
Pages (from-to)206-216
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - 11 Oct 2016
Externally publishedYes


  • Binaries: general
  • Planetary nebulae: general
  • Stars: AGB and post-AGB
  • Stars: mass-loss

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