Gap opening in protoplanetary discs: gas dynamics from global axisymmetric non-ideal MHD simulations with consistent thermochemistry
Gap opening in protoplanetary discs: gas dynamics from global axisymmetric non-ideal MHD simulations with consistent thermochemistry
复制标题
原行星盘中的间隙开口:来自具有一致热化学的全局轴对称非理想 MHD 模拟的气体动力学
DOI:
10.1093/mnras/stad1632
复制
发表时间:
2023
影响因子:
4.8
通讯作者:
Bae, Jaehan
中科院分区:
文献类型:
--
作者:
Hu, Xiao;Li, Zhi-Yun;Wang, Lile;Zhu, Zhaohuan;Bae, Jaehan
Recent high angular resolution ALMA observations have revealed numerous gaps in protoplanetary discs. A popular interpretation has been that planets open them. Most previous investigations of planet gap-opening have concentrated on viscous discs. Here, we carry out 2D (axisymmetric) global simulations of gap opening by a planet in a wind-launching non-ideal MHD disc with consistent thermochemistry. We find a strong concentration of poloidal magnetic flux in the planet-opened gap, where the gas dynamics are magnetically dominated. The magnetic field also drives a fast (nearly sonic) meridional gas circulation in the denser disc regions near the inner and outer edges of the gap, which may be observable through high-resolution molecular line observations. The gap is more ionized than its denser surrounding regions, with a better magnetic field–matter coupling. In particular, it has a much higher abundance of molecular ion HCO+, consistent with ALMA observations of the well-studied AS 209 protoplanetary disc that has prominent gaps and fast meridional motions reaching the local sound speed. Finally, we provide fitting formulae for the ambipolar and Ohmic diffusivities as a function of the disc local density, which can be used for future 3D simulations of planet gap-opening in non-ideal MHD discs where thermochemistry is too computationally expensive to evolve self-consistently with the magneto-hydrodynamics.
登录
查看更多内容
影响因子:
4.8
作者:
Scott S Suriano;Zhi;R. Krasnopolsky;H. Shang
通讯作者:
H. Shang
影响因子:
4.9
作者:
Ida, S;Lin, DNC
通讯作者:
Lin, DNC
DOI:
10.3847/1538-4357/ab06fd
发表时间:
2018-10
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Lile Wang;X. Bai;J. Goodman
通讯作者:
Lile Wang;X. Bai;J. Goodman
DOI:
10.1086/177041
发表时间:
1996
期刊:
The Astrophysical Journal
影响因子:
--
作者:
R. Matsumoto;Y. Uchida;S. Hirose;K. Shibata;M. Hayashi;A. Ferrari;G. Bodo;C. Norman
通讯作者:
C. Norman
DOI:
10.1146/annurev-astro-081811-125523
发表时间:
2012-03
影响因子:
33.3
作者:
W. Kley;R. Nelson
通讯作者:
W. Kley;R. Nelson