The effect of a wider initial separation on common envelope binary interaction simulations

Roberto Iaconi*, Thomas Reichardt, Jan Staff, Orsola De Marco, Jean Claude Passy, Daniel Price, James Wurster, Falk Herwig

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    73 Citations (Scopus)

    Abstract

    We present hydrodynamic simulations of the common envelope binary interaction between a giant star and a compact companion carried out with the adaptive mesh refinement code ENZO and the smooth particle hydrodynamics code PHANTOM. These simulations mimic the parameters of one of the simulations by Passy et al. but assess the impact of a larger, more realistic initial orbital separation on the simulation outcome. We conclude that for both codes the post-common envelope separation is somewhat larger and the amount of unbound mass slightly greater when the initial separation is wide enough that the giant does not yet overflow or just overflows its Roche lobe. PHANTOM has been adapted to the common envelope problem here for the first time and a full comparison with ENZO is presented, including an investigation of convergence as well as energy and angular momentum conservation. We also set our simulations in the context of past simulations. This comparison reveals that it is the expansion of the giant before rapid in-spiral and not spinning up of the star that causes a larger final separation. We also suggest that the large range in unbound mass for different simulations is difficult to explain and may have something to do with simulations that are not fully converged.

    Original languageEnglish
    Pages (from-to)4028-4044
    Number of pages17
    JournalMonthly Notices of the Royal Astronomical Society
    Volume464
    Issue number4
    DOIs
    Publication statusPublished - 2017

    Keywords

    • Binaries: close
    • Hydrodynamics
    • Methods: numerical
    • Stars: AGB and post-AGB
    • Stars: evolution

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