Breezing through the space environment of Barnard’s Star b. (arXiv:1901.00219v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Alvarado_Gomez_J/0/1/0/all/0/1">Juli&#xe1;n D. Alvarado-G&#xf3;mez</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Garraffo_C/0/1/0/all/0/1">Cecilia Garraffo</a> (2,1), <a href="http://arxiv.org/find/astro-ph/1/au:+Drake_J/0/1/0/all/0/1">Jeremy J. Drake</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Brown_B/0/1/0/all/0/1">Benjamin P. Brown</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Oishi_J/0/1/0/all/0/1">Jeffrey S. Oishi</a> (4), <a href="http://arxiv.org/find/astro-ph/1/au:+Moschou_S/0/1/0/all/0/1">Sofia P. Moschou</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Cohen_O/0/1/0/all/0/1">Ofer Cohen</a> (5) ((1) Center for Astrophysics | Harvard &amp; Smithsonian, (2) Institute for Applied Computational Science, Harvard University (3) Department of Astrophysical and Planetary Sciences, Laboratory for Atmospheric and Space Physics, University of Colorado at Boulder (4) Department of Physics and Astronomy, Bates College (5) University of Massachusetts at Lowell, Department of Physics &amp; Applied Physics)

A physically realistic stellar wind model based on Alfv’en wave dissipation
has been used to simulate the wind from Barnard’s Star and to calculate the
conditions at the location of its recently discovered planetary companion.
Barnard’s Star b experiences much less intense wind pressure than the much more
close-in planet Proxima~b and the planets of the TRAPPIST-1 system. The milder
wind conditions are more a result of its much greater orbital distance rather
than in differences in the surface magnetic field strengths of the host stars.
The dynamic pressure is on average 15 times higher than experienced by the
present-day Earth, and undergoes variations by factors of several as it passes
through the current sheet in each orbit. The magnetospause standoff distance is
$sim$$30 – 60$% smaller than that of the Earth for an equivalent planetary
magnetic field strength.

A physically realistic stellar wind model based on Alfv’en wave dissipation
has been used to simulate the wind from Barnard’s Star and to calculate the
conditions at the location of its recently discovered planetary companion.
Barnard’s Star b experiences much less intense wind pressure than the much more
close-in planet Proxima~b and the planets of the TRAPPIST-1 system. The milder
wind conditions are more a result of its much greater orbital distance rather
than in differences in the surface magnetic field strengths of the host stars.
The dynamic pressure is on average 15 times higher than experienced by the
present-day Earth, and undergoes variations by factors of several as it passes
through the current sheet in each orbit. The magnetospause standoff distance is
$sim$$30 – 60$% smaller than that of the Earth for an equivalent planetary
magnetic field strength.

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