Contributed Talk - Splinter Exoplanets

Tuesday, 13 September 2022, 14:45   (SFG 1010 / virtual Exo)

The impact of self-gravity smoothing length on dust dust-laden vortices simulations

Steven Rendon Restrepo and Pierre Barge
Aix Marseille Univ, CNRS, CNES, LAM, France

Large scale vortices are thought to be natural outcomes of hydrodynamic instabilities in protoplanetary disks, as for instance the Rossby wave instability [1] or Baroclinic instability. Analytical and numerical studies showed that they can be long-lived and catalyze efficiently dust material concentration (e.g) [2], [3] and encourage to think they could play a role in protoplanetary-disk evolution and planetesimal formation. Their presence in the outer regions of circumstellar disks is possibly betrayed by recent observations of lopsided structures with ALMA and VLT [4], [5]. Self-gravity (SG) plays a key role in this scenario, particularly when high dust density clumps are trapped in the vortex core. In the case of 2D bi-fluid simulations, we demonstrate that SG needs to be estimated four times, instead of one, in order to correctly account for dust contribution. This requires introducing a gas-dust smoothing length which could be key for an eventual gravitational collapse and/or gaseous envelope capture. We propose to show our early results on this problem, which was addressed using high-resolution, bi-fluid simulations in a thin disc (2D) thanks to the new RoSSBi3D [6] code. References: [1] Lovelace, R. V. E., Li, H., Colgate, S. A., & Nelson, A. F. 1999, ApJ, 513, 805 [2] Barge, P. & Sommeria, J. 1995, A&A, 295, L1 [3] Tanga, P., Babiano, A., Dubrulle, B., & Provenzale, A. 1996, Icarus, 121, 158 [4] Tsukagoshi, T., Muto, T., Nomura, H., et al. 2019, ApJ, 878, L8 [5] Dong, R., Liu, S.-y., Eisner, J., et al. 2018, ApJ, 860, 124 [6] Rendon Restrepo, S., Barge, P., and Vavrik, R., “RoSSBi3D: a 3D and bi-fluid code for protoplanetary discs”, submitted to A&A (2022)