Meeting Update 7/28/2014

Anisotropic Windflows from close in Exo-planets (Stone & Proga 2009)

  • Close-in EGP's: a < 0.1 AU. Because of tidal locking and irradiation on only one side, the assumption of spherical symmetry no longer holds.
  • The paper investigates the effect of anisotropic heating on winds in 2D.

Method: Take hydrodynamic equations in polar coordinates. Introduce anisotropy by making internal energy a function of theta on the surface of the planet.

  • Hydrodynamic escape parameter.

-Adiabatic Index.

Some results:

-Evidence of non-radial outflow.

-Inflow on the night side

-Shock front as the wind flows from the day side to night side.

-Only radial outflow at large radii.

-Nearly isothermal.

-Sonic surface at 0.5R. Decelerating wind on the night side?

-Density variations b/w opposite sides are only significant very close to the planet.

-Polar velocity increasing as you go from day to night side; discontinuity at the shock.

-Effect of increasing gamma. Cooling.

-Mass loss rate decreased by a factor of 2.

-Model not valid at very large distances. Effect of including stellar winds?

-Met Jonathan for a walk-through of the 3D outflow routine.

Attachments (5)

Download all attachments as: .zip

Comments

No comments.