Title: Effects of turbulent diffusion and back-reaction on the dust distribution around two resonant planets

Abstract

In evolved and dusty circumstellar discs, two planets with masses comparable to Jupiter and Saturn that migrate outwards while maintaining an orbital resonance can produce distinctive features in the dust distribution. Dust accumulates at the outer edge of the common gas gap, which behaves as a dust trap, where the local dust concentration is significantly enhanced by the planets’ outward motion. Concurrently, an expanding cavity forms in the dust distribution inside the planets’ orbits, because dust does not filter through the common gaseous gap and grain depletion in the region continues via inward drifting. There is no cavity in the gas distribution because gas can filter through the gap, although ongoing gas accretion on the planets can reduce the gas density in the inner disc. Such behaviour was demonstrated by means of simulations neglecting the effects of dust diffusion due to turbulence and of dust backreaction on the gas. Both effects may alter the formation of the dust peak at the gap outer edge and of the inner dust cavity, by letting grains filter through the dust trap. We performed high-resolution hydrodynamical simulations of the coupled evolution of gas and dust species, the latter treated as pressureless fluids, in themore » presence of two giant planets. We show that diffusion and backreaction can change some morphological aspects of the dust distribution but do not alter some main features, such as the outer peak and the expanding inner cavity. Furthermore, these findings are confirmed for different parametrizations of gas viscosity.« less

Authors:

Marzari, Francesco  ^[1];

• Search DOE PAGES for author "Marzari, Francesco"
• Search DOE PAGES for ORCID "0000-0003-0724-9987"

D’Angelo, Gennaro  ^[2]

• Search DOE PAGES for author "D’Angelo, Gennaro"
• Search DOE PAGES for ORCID "0000-0002-2064-0801"

---

+ Show Author Affiliations

1. Univ. of Padova (Italy)
2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:

Fri Jan 27 00:00:00 EST 2023

Research Org.:

Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:

National Aeronautics and Space Administration (NASA)

OSTI Identifier:

1973823

Report Number(s):

LA-UR-23-24169
Journal ID: ISSN 0035-8711; TRN: US2313937

Grant/Contract Number:  

89233218CNA000001

Resource Type:

Accepted Manuscript

Journal Name:

Monthly Notices of the Royal Astronomical Society

Additional Journal Information:

Journal Volume: 520; Journal Issue: 2; Journal ID: ISSN 0035-8711

Publisher:

Oxford University Press

Country of Publication:

United States

Language:

English

Subject:

79 ASTRONOMY AND ASTROPHYSICS; Astronomy and astrophysics; protoplanetary discs; methods: numerical; planets and satellites: gaseous planets; planet-disc interactions