  Hot super-Earths likely possess minimal atmospheres established through vapor
saturation equilibrium with the ground. We solve the hydrodynamics of these
tenuous atmospheres at the surface of Corot-7b, Kepler 10b and 55 Cnc-e,
including idealized treatments of magnetic drag and ohmic dissipation. We find
that atmospheric pressures remain close to their local saturation values in all
cases. Despite the emergence of strongly supersonic winds which carry
sublimating mass away from the substellar point, the atmospheres do not extend
much beyond the day-night terminators. Ground temperatures, which determine the
planetary thermal (infrared) signature, are largely unaffected by exchanges
with the atmosphere and thus follow the effective irradiation pattern.
Atmospheric temperatures, however, which control cloud condensation and thus
albedo properties, can deviate substantially from the irradiation pattern.
Magnetic drag and ohmic dissipation can also strongly impact the atmospheric
behavior, depending on atmospheric composition and the planetary magnetic field
strength. We conclude that hot super-Earths could exhibit interesting
signatures in reflection (and possibly in emission) which would trace a
combination of their ground, atmospheric and magnetic properties.
