Hot Jupiter Magnetospheres

Details Hot Jupiter Magnetospheres Hot Jupiter Magnetospheres

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.4023t&link_type=abstract

American Astronomical Society, ESS meeting #2, #40.23

Astronomy and Astrophysics

Astronomy

Scientific paper

Transmission spectra from ground and space-based observations are probing several close-in gas giant exoplanet upper atmospheres. Due to strong heating and high expected ionization levels, the planetary magnetic field plays a fundamental role in the gas dynamics. We present numerical MHD simulations of upper atmosphere structure, including the intrinsic planetary magnetic field and the stellar tide. In addition to a magnetically-confined region near the equator and an outflow at mid-latitudes, magnetically-dominated region that supports an outflow, there is a third region near the poles where an outflow can be quenched by a sufficiently strong stellar tide. We demonstrate the effects of the magnetic field and stellar tide on the optical depth and velocity structure, as well as the resulting mass and angular momentum loss rates. Model Lyman α transmission spectra are computed from the simulations and compared with the Hubble observations, in order to provide constraints on the atmospheric structure.

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