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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2019

Rigidly rotating, incompressible spheroid-ring systems: new bifurcations, critical rotations and degenerate states

B. Boutin-Basillais
  • Fonction : Auteur
J.-M. Huré
  • Fonction : Auteur

Résumé

The equilibrium of incompressible spheroid-ring systems in rigid rotation is investigated by numerical means for a unity density contrast. A great diversity of binary configurations is obtained, with no limit neither in the mass ratio, nor in the orbital separation. We found only detached binaries, meaning that the end-point of the ɛ2-sequence is the single binary state in strict contact, easily prone to mass-exchange. The solutions show a remarkable confinement in the rotation frequency-angular momentum diagram, with a total absence of equilibrium for Ω2/πGρ ≳ 0.21. A short band of degeneracy is present next to the one-ring sequence. We unveil a continuum of bifurcations all along the ascending side of the Maclaurin sequence for eccentricities of the ellipsoid less than ≈0.612 and which involves a gradually expanding, initially massless loop.
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Dates et versions

hal-02165831 , version 1 (30-05-2023)

Identifiants

Citer

B. Boutin-Basillais, J.-M. Huré. Rigidly rotating, incompressible spheroid-ring systems: new bifurcations, critical rotations and degenerate states. Monthly Notices of the Royal Astronomical Society, 2019, 487 (4), pp.4504-4509. ⟨10.1093/mnras/stz1615⟩. ⟨hal-02165831⟩

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