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    Formation of close binaries by disc fragmentation and migration, and its statistical modelling

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    Author
    Tokovinin, Andrei
    Moe, Maxwell
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2019-11-26
    Keywords
    binaries: close
    binaries: general
    binaries: spectroscopic
    stars: formation
    
    Metadata
    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    Andrei Tokovinin, Maxwell Moe, Formation of close binaries by disc fragmentation and migration, and its statistical modelling, Monthly Notices of the Royal Astronomical Society, Volume 491, Issue 4, February 2020, Pages 5158–5171, https://doi.org/10.1093/mnras/stz3299
    Journal
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
    Rights
    Copyright © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Joint statistics of periods and mass ratios of close binaries and its dependence on primary mass can be explained by assuming that seed binary companions are formed by disc fragmentation at random intervals during assemblage of stellar mass and migrate inwards as they accrete from the circumbinary disc. A toy model based on simple prescriptions for the companion growth and migration reproduces such aspects of close solar-mass binaries as the distribution of binary periods P, the brown dwarf desert at short P, the nearly uniform distribution of mass ratios, and a population of equal-mass binaries (twins) that decreases linearly in frequency with log P. For massive stars, the model predicts a large fraction of early mergers, a distribution of log P with a negative slope, and a mass-ratio distribution that is also uniform but with a substantially reduced twin fraction. By treating disc fragmentation as a stochastic process, we also reproduce the observed properties of compact triples. Success of our toy model suggests that most close binaries and compact triples indeed formed by disc fragmentation followed by accretion-driven inward migration.
    ISSN
    0035-8711
    DOI
    10.1093/mnras/stz3299
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stz3299
    Scopus Count
    Collections
    UA Faculty Publications

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