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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: [email protected]
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: [email protected]
J. Grunhut
Affiliation:
ESO, Karl-Schwarschild-Str. 2, D-85748, Garching bei München, Germany email: [email protected]
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 

References

Alvarado-Gómez, J. D., Grunhut, J., Hussain, G. A. J., et al. 2015, A&A (submitted)Google Scholar
Cohen, O., Drake, J. J., Kashyap, V. L., Hussain, G. A. J. C., & Gombosi, T. I. 2010, ApJ 721, 80 Google Scholar
Cohen, O. & Drake, J. J. 2014, ApJ 783, 55 CrossRefGoogle Scholar
Cohen, O., Drake, J. J., Glocer, A., et al. 2014, ApJ 790, 57 Google Scholar
Garraffo, C., Cohen, O., Drake, J. J., & Downs, C. 2013, ApJ 764, 32 CrossRefGoogle Scholar
Ghezzi, L., Cunha, K., Smith, V. V., de Araújo, F. X., Schuler, S. C. & de la Reza, R. 2010, ApJ 720, 1290 CrossRefGoogle Scholar
Hussain, G. A. J., Jardine, M., Donati, J.-F., et al. 2007, MNRAS 377, 1488 Google Scholar
Hussain, G. A. J., Collier Cameron, A., Jardine, M. M., et al. 2009, MNRAS 398, 189 Google Scholar
Hussain, G. A. J. & Alecian, E. 2014, in: Jardine, M., Petit, P. & Spruit, H. (eds.), Magnetic Fields Throughout Stellar Evolution Proc. IAU Symposium No. 302 (France), p. 25CrossRefGoogle Scholar
Jordan, C., Sim, S. A., McMurry, A. D., & Aruvel, M. 2001, MNRAS 326, 303 CrossRefGoogle Scholar
Naef, D., Mayor, M., Pepe, F., Queloz, D., Santos, N. C., Udry, S., & Burnet, M. 2001, A&A 375, 205 Google Scholar
Powell, K. G., Roe, P. L., Linde, T. J., Gombosi, T. I., & De Zeeuw, D. L. 1999, J. of Computational Phys. 154, 284 Google Scholar
Shaviv, N. J. 2003, J. Geophys. Res 108, 1437 Google Scholar
Sokolov, I. V., van der Holst, B., Oran, R., et al. 2013, ApJ 764, 23 CrossRefGoogle Scholar
Terada, N., Kulikov, Y. N., Lammer, H., Lichtenegger, H. I. M., Tanaka, T., Shinagawa, H., & Zhang, T. 2009, Astrobiology 9, 55 Google Scholar
Torres, C. A. O., Quast, G. R., da Silva, L., de La Reza, R., Melo, C. H. F., & Sterzik, M. 2006, A&A 490, 695 Google Scholar
Tóth, G., van der Holst, B., Sokolov, I. V., et al. 2012, J. of Computational Phys. 231, 870 Google Scholar
van der Holst, B., Sokolov, I. V., Meng, X., Jin, M., Manchester, W. B. IV, Tóth, G., & Gombosi, T. I. 2014, ApJ 782, 81 Google Scholar
Vidotto, A. A., Jardine, M., Opher, M., Donati, J. F., & Gombosi, T. I. 2011, MNRAS 412, 351 Google Scholar
Vidotto, A. A. and Gregory, S. G., Jardine, M., et al. 2014, MNRAS 441, 2361 Google Scholar
Wood, B. E., Müller, H.-R., Redfield, S., & Edelman, E. 2014, ApJ 781, L33 Google Scholar