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Population synthesis for double white dwarfs. II. Semi-detached systems: AM CVn stars

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arxiv astro-ph/0101123 v1 pith:LU3DWLDV submitted 2001-01-09 astro-ph

G. Nelemans , S. F. Portegies Zwart , F. Verbunt , L. R. Yungelson This is my paper · ORCID
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We study two models for AM CVn stars: white dwarfs accreting (i) from a helium white dwarf companion and (ii) from a helium-star donor. We show that in the first model possibly no accretion disk forms at the onset of mass transfer. The stability and the rate of mass transfer then depend on the tidal coupling between the accretor and the orbital motion. In the second model the formation of AM CVn stars may be prevented by detonation of the CO white dwarf accretor and the disruption of the system. With the most favourable conditions for the formation of AM CVn stars we find a current Galactic birth rate of 6.8 10^{-3} yr^{-1}. Unfavourable conditions give 1.1 10^{-3} yr^{-1}. The expected total number of the systems in the Galaxy is 9.4 10^{7} and 1.6 10^{7}, respectively. We model very simple selection effects to get some idea about the currently expected observable population and discuss the (quite good) agreement with the observed systems.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. A survey of ultra-compact high-state AM CVn binaries with ZTF and Gaia: New discoveries and observational constraints on Galactic space density

    astro-ph.SR 2026-08 conditional novelty 7.0 of 10

    Three new high-state AM CVn binaries are discovered, giving a local space density of about 1 to 3 per 10^8 cubic parsecs and LISA detection estimates near 36% of the Galactic population.

  2. V407 Vul: a triple star system with an AM CVn detectable by gravitational wave observatories

    astro-ph.SR 2026-07 accept novelty 7.0 of 10

    V407 Vul is a hierarchical triple: a 569-s AM CVn white-dwarf binary bound to a G-type tertiary at ~120 AU, the first 'verification triple' for LISA.

  3. Search for Higher Harmonic Signals from Close White Dwarf Binaries in the mHz Band

    astro-ph.HE 2025-06 conditional novelty 6.0 of 10

    LISA could detect the post-Newtonian (3,3) harmonic from the nearest close white dwarf binaries, with detection probability up to 98% if LISA, Taiji, and TianQin combine data over 10 years.

  4. Population Synthesis of Gravitational Wave Sources

    astro-ph.HE 2025-02 accept novelty 1.0 of 10

    A review of population synthesis: the codes, the environments, and the predicted rates and features of gravitational wave sources, with an emphasis on breaking degeneracies.

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