Effects of dust feedback on vortices in protoplanetary disks

We carried out two-dimensional high-resolution simulations to study the effect of dust feedback on the evolution of vortices induced by massive planets in protoplanetary disks. Various initial dust to gas disk surface density ratios ($0.001$ -- $0.01$) and dust particle sizes (Stokes number $4\times10^{-4}$ -- $0.16$) are considered. We found that while dust particles migrate inwards, vortices are very effective in collecting them. When dust density becomes comparable to gas density within the vortex, a dynamical instability is excited and it alters the coherent vorticity pattern and destroys the vortex. This dust feedback effect is stronger with higher initial dust/gas density ratio and larger dust grain. Consequently, we found that the disk vortex lifetime can be reduced up to a factor of 10. We discuss the implications of our findings on the survivability of vortices in protoplanetary disks and planet formation.

Comments: Accepted for publication in ApJ Letter

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2017May
Affiliations: 1Instituto de Astrofisica de Andalucia, 2LESIA-Observatoire de Paris, CNRS, UPMC Univ. Paris 6, Univ. Paris-Diderot, France, 3Aix Marseille Universite, CNRS, LAM, France, 4Astrophysics Research Centre, Queen's University Belfast, United Kingdom, 5Max-Planck-Institut fur extraterrestrische Physik, 6Instituto de Astrofisica de Andalucia, 7Konkoly Observatory of the Hungarian Academy of Sciences, Hungary, 8Max-Planck-Institut fur extraterrestrische Physik, 9Space Telescope Science Institute, USA, 10Instituto de Astrofisica de Andalucia, 11LESIA-Observatoire de Paris, CNRS, UPMC Univ. Paris 6, Univ. Paris-Diderot, France, 12Aix Marseille Universite, CNRS, LAM, France, 13Lowell Observatory, USA

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