Skip to Main content Skip to Navigation
Journal articles

On the cavity size in circumbinary discs

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. 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 semimajor axis, increasing with eccentricity and decreasing with disc aspect ratio. When considering binaries inclined with respect to the disc, we find three regimes: (i) discs that evolve towards a coplanar orbit have a large cavity, slightly smaller than that of an initially coplanar disc; (ii) discs that evolve towards a polar orbit by breaking have a small cavity, equal in size to that of an initially polar disc; and (iii) discs that evolve towards a polar orbit via warping have an intermediate-sized cavity. We find typical gas depletions inside the cavity of ≳2 orders of magnitude in surface density.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03711457
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Friday, July 1, 2022 - 1:49:51 PM
Last modification on : Saturday, September 24, 2022 - 12:02:05 PM

Links full text

Identifiers

Collections

Citation

Kieran Hirsh, Daniel J. Price, Jean-François Gonzalez, M. Giulia Ubeira-Gabellini, Enrico Ragusa. On the cavity size in circumbinary discs. Monthly Notices of the Royal Astronomical Society, 2020, 498, pp.2936-2947. ⟨10.1093/mnras/staa2536⟩. ⟨insu-03711457⟩

Share

Metrics

Record views

2