Binary star formation and the outflows from their discs

Rajika L. Kuruwita*, Christoph Federrath, Michael Ireland

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)
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We carry out magnetohydrodynamical simulations with FLASH of the formation of a single, a tight binary (a∼2.5 au) and awide binary star (a ∼ 45 au).We study the outflows and jets from these systems to understand the contributions the circumstellar and circumbinary discs have on the efficiency and morphology of the outflow. In the single star and tight binary case, we obtain a single pair of jets launched from the system, while in the wide binary case, two pairs of jets are observed. This implies that in the tight binary case, the contribution of the circumbinary disc on the outflow is greater than that in the wide binary case. We also find that the single star case is the most efficient at transporting mass, linear and angular momentum from the system, while the wide binary case is less efficient (∼50 per cent,∼33 per cent,∼42 per cent of the respective quantities in the single star case). The tight binary's efficiency falls between the other two cases (∼71 per cent,∼66 per cent,∼87 per cent of the respective quantities in the single star case). By studying the magnetic field structure, we deduce that the outflows in the single star and tight binary star case are magnetocentrifugally driven, whereas in the wide binary star case, the outflows are driven by a magnetic pressure gradient.

Original languageEnglish
Pages (from-to)1626-1641
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - 2017
Externally publishedYes

Bibliographical note

Copyright 2017 The Authors. First published in Monthly notices of the Royal Astronomical Society, 470(2), pp. 1626–1641. The original publication is available at, published by Oxford University Press on behalf of the Royal Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


  • MHD
  • binaries: general
  • stars: formation
  • stars: jets
  • ISM: jets and outflows


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