The Coronal Structure of the Sun-Like Exoplanet-Host GJ 3021

被引：0

作者：

Alvarado-Gomez, J. D. ^{[1
]}

Cohen, O. ^{[2
]}

Hussain, G. A. J. ^{[1
]}

Grunhut, J. ^{[1
]}

Garraffo, C. ^{[2
]}

Drake, J. ^{[2
]}

机构：

[1] ESO, Karl Schwarschild Str 2, D-85748 Garching, Germany

[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

来源：

POLARIMETRY: FROM THE SUN TO STARS AND STELLAR ENVIRONMENTS | 2015年 / 10卷 / 305期

关键词：

Stars: coronae; stars: magnetic fields; stars: mass loss; stars: winds; outflows; SOLAR-WIND; ATMOSPHERE; PLANETS;

D O I：

10.1017/S1743921315004901

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the results of a numerical simulation of the corona and wind structure of the Sun-like exoplanet-host GJ 3021 using a global magnetohydrodynamic (MHD) model. The simulation is driven by the radial component of the surface magnetic field recovered with the Zeeman Doppler Imaging (ZDI) technique. We consider two different ZDI input maps, which have similar large-scale structures but different spatial resolutions and field strengths. These maps arise from different but comparable models used to fit the observed circularly polarised spectra of the star. Our simulations show that the structure of the inner corona is consistent among the considered cases. Larger discrepancies are found in the wind structure, in particular in the radial wind speed and the Alfven surface topology. These elements can have a significant impact on the mass loss and angular momentum loss predicted for this system and in other studies based on this numerical data-driven approach.

引用

页码：282 / 287

页数：6