Dust back reaction on gas around planets modifies the cold thermal torque

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10510770" target="_blank" >RIV/00216208:11320/25:10510770 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=YZRaoghH6j" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=YZRaoghH6j</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202452971" target="_blank" >10.1051/0004-6361/202452971</a>

Result language

angličtina

Original language name

Dust back reaction on gas around planets modifies the cold thermal torque

Original language description

Context. A nascent planet in a gas disk experiences radial migration due to the different torques that act on it (e.g., Lindblad and corotation torques). It has recently been shown that the torques produced by the gas and dust density variations around a non-accreting low-mass planet, the so-called cold thermal and dust streaming torques, can surpass each of the other torque components. Aims. We investigate how the total torque acting on the planet is affected by the presence of dust grains and their aerodynamic back reaction on gas, while taking into account the cold thermal torque produced by thermal diffusion in the gas component. Methods. We performed high-resolution local and global three-dimensional two-fluid simulations within the pressureless-fluid dust approximation using the Fargo3D code. We explored the influence of different dust species parameterized by the Stokes number, focusing on non-accreting protoplanets with masses from one-third the mass of Mars to one Earth mass. Results. The dust feedback has a substantial impact on the asymmetry of the cold thermal lobes (which produce the cold thermal torque). However, the total torque is dominated by the dust torque when St &gt; 10(-2). The dust torque becomes more negative over time due to the formation of dust lobes that resemble the cold thermal lobes that form in the gas component. Therefore, the dust streaming torque prevails over the cold thermal torque. On the other hand, when St = 10(-2), the dust streaming torque is negligible and thus, the total torque on the planet comes from the gaseous component of the disk. Conclusions. Our results suggest that a planet embedded in a gas-dust disk may experience stagnant migration or inward runaway migration in regions of the protoplanetary disk where the dust is not fully coupled to the gas. However, this behavior could change in regions with strong dust-gas coupling or in the inner transition region of the disk, where the cold thermal torque may become relevant.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GM21-23067M" target="_blank" >GM21-23067M: Hydrodynamic interactions of planets with protoplanetary disks and the origin of close-in exoplanetary systems</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomy &amp; Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Volume of the periodical

704

Issue of the periodical within the volume

prosinec

Country of publishing house

FR - FRANCE

Number of pages

10

Pages from-to

A207

UT code for WoS article

001640452000023

EID of the result in the Scopus database

2-s2.0-105025442553