Primordial Dusty Rings and Episodic Outbursts in Protoplanetary Discs
Kundan Kadam, Eduard Vorobyov, Shantanu Basu

TL;DR
This study uses long-term magnetohydrodynamic simulations to explore how primordial dusty rings form and evolve in protoplanetary discs, revealing their role in planetesimal and planet formation, especially during episodic outbursts.
Contribution
It introduces comprehensive dust-gas magnetic simulations showing that dusty rings are more numerous, extensive, and robust, influencing planetesimal formation during episodic outbursts.
Findings
Dusty rings are more numerous and extensive with dust evolution included.
Rings can become streaming unstable, leading to rapid planetesimal formation.
Episodic outbursts affect dust distribution but still allow planet formation.
Abstract
We investigate the formation and evolution of "primordial" dusty rings occurring in the inner regions of protoplanetary discs, with the help of long-term, coupled dust-gas, magnetohydrodynamic simulations. The simulations are global and start from the collapse phase of the parent cloud core, while the dead zone is calculated via an adaptive formulation by taking into account the local ionization balance. The evolution of the dusty component includes its growth and back reaction on to the gas. Previously, using simulations with only a gas component, we showed that dynamical rings form at the inner edge of the dead zone. We find that when dust evolution as well as magnetic field evolution in the flux-freezing limit are included, the dusty rings formed are more numerous and span a larger radial extent in the inner disc, while the dead zone is more robust and persists for a much…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Astro and Planetary Science · Stellar, planetary, and galactic studies
