2020
DOI: 10.48550/arxiv.2008.08008
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On the cavity size in circumbinary discs

Kieran Hirsh,
Daniel J Price,
Jean-François Gonzalez
et al.

Abstract: How does the cavity size in circumbinary discs depend on disc and binary properties? We investigate by simulating disc cavities carved by binary companions using smoothed particle hydrodynamics (SPH). We find that a cavity is quickly opened on the dynamical time, while the cavity size is set on the viscous time. In agreement with previous findings, we find long term cavity sizes of 2-5 times the binary semi-major axis, increasing with eccentricity and decreasing with disc aspect ratio. When considering binarie… Show more

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“…First of all, the inner region below r ≈ 2b is briskly cleared of material, forming a low-density cavity, as reported previously in the literature (e.g. Artymowicz & Lubow 1994MacFadyen & Milosavljevic 2008Hirsh et al 2020 ). From t = 0 to ∼50 P orb , the density obtained along the φ = 0 and φ = π directions is qualitatively similar, indicating that if asymmetries are present, they are negligible (e.g.…”
Section: Early Stage and Preser V Ed Symmetrysupporting
confidence: 80%
“…First of all, the inner region below r ≈ 2b is briskly cleared of material, forming a low-density cavity, as reported previously in the literature (e.g. Artymowicz & Lubow 1994MacFadyen & Milosavljevic 2008Hirsh et al 2020 ). From t = 0 to ∼50 P orb , the density obtained along the φ = 0 and φ = π directions is qualitatively similar, indicating that if asymmetries are present, they are negligible (e.g.…”
Section: Early Stage and Preser V Ed Symmetrysupporting
confidence: 80%