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On the influence of magnetic fields in neutral planetary wakes

Published online by Cambridge University Press:  12 September 2017

C. Villarreal D’Angelo ,
M. Schneiter  and
A. Esquivel
C. Villarreal D’Angelo
Affiliation:
Instituto de Astronomía Teórica y Experimental, Conicet-UNC, Laprida 854, X5000BGR, Córdoba, Argentina email: carolina.villarreal@unc.edu.ar
M. Schneiter
Affiliation:
Instituto de Astronomía Teórica y Experimental, Conicet-UNC, Laprida 854, X5000BGR, Córdoba, Argentina email: carolina.villarreal@unc.edu.ar
A. Esquivel
Affiliation:
Instituto de Ciencias Nucleares, UNAM, C. Univ., AP 70-543 México D.F., México
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Abstract

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We present a 3D magnetohydrodynamic study of the effect that stellar and planetary magnetic fields have on the calculated Lyα absorption during the planetary transit, employing parameters that resemble the exoplanet HD209458b. We assume a dipolar magnetic field for both the star and the planet, and use the Parker solution to initialize the stellar wind. We also consider the radiative processes and the radiation pressure.

We use the numerical MHD code Guacho to run several models varying the values of the planetary and stellar magnetic moments within the range reported in the literature.

We found that the presence of magnetic fields influences the escaping neutral planetary material spreading the absorption Lyα line for large stellar magnetic fields.

Keywords

line: profilesmethods: numericalmagnetic fieldsstars: windsstars: individual (HD209458)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S328: Living Around Active Stars , October 2016 , pp. 192 - 197
Copyright
Copyright © International Astronomical Union 2017 

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