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

Published online by Cambridge University Press:  24 July 2015

J. D. Alvarado-Gómez ,
O. Cohen ,
G. A. J. Hussain ,
J. Grunhut ,
C. Garraffo  and
J. Drake
J. D. Alvarado-Gómez
Affiliation:
ESO, Karl-Schwarschild-Str. 2, D-85748, Garching bei München, Germany email: jalvarad@eso.org
O. Cohen
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
G. A. J. Hussain
Affiliation:
ESO, Karl-Schwarschild-Str. 2, D-85748, Garching bei München, Germany email: jalvarad@eso.org
J. Grunhut
Affiliation:
ESO, Karl-Schwarschild-Str. 2, D-85748, Garching bei München, Germany email: jalvarad@eso.org
C. Garraffo
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
J. Drake
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
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Abstract

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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 Alfvén 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.

Keywords

Stars: coronaestars: magnetic fieldsstars: mass lossstars: windsoutflows
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S305: Polarimetry: From the Sun to Stars and Stellar Environments , December 2014 , pp. 282 - 287
Copyright
Copyright © International Astronomical Union 2015 

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