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Related Experiment Videos

Formation of Short-Period Binary Pulsars in Globular Clusters.

Rasio, Pfahl, Rappaport

    The Astrophysical Journal
    |March 4, 2000
    PubMed
    Summary

    We propose a new model for forming short-period binary millisecond pulsars in globular clusters. This scenario explains observed pulsar properties in 47 Tuc, involving common envelope evolution and stable mass transfer.

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    Area of Science:

    • Astrophysics
    • Stellar Dynamics
    • Binary Evolution

    Background:

    • Globular clusters host numerous millisecond pulsars.
    • Neutron stars in dense clusters often interact with primordial binaries.
    • Observations of 20 radio pulsars in 47 Tuc motivate this study.

    Purpose of the Study:

    • To present a new dynamical scenario for the formation of short-period binary millisecond pulsars.
    • To explain the observed properties of pulsars in the globular cluster 47 Tuc.

    Main Methods:

    • Investigating dynamical interactions in dense stellar environments.
    • Modeling binary evolution, including Roche lobe overflow and common envelope phases.
    • Analyzing mass transfer stability and orbital decay mechanisms.

    Main Results:

    • Most neutron stars in dense clusters gain companions via exchange interactions.
    • Dynamically unstable mass transfer leads to common envelope evolution and neutron star-white dwarf binaries.
    • Subsequent stable mass transfer, driven by gravitational radiation and tidal heating, forms short-period binaries.

    Conclusions:

    • The proposed scenario successfully reproduces the characteristics of observed binary pulsars in 47 Tuc.
    • Common envelope evolution is a key pathway to short-period binary pulsar formation.
    • Gravitational radiation and tidal heating play crucial roles in the final binary evolution.

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