Exoplanetary magnetodisc in a context of other types of astrophysical discs

Details Exoplanetary magnetodisc in a context of other types of astrophysical discs Exoplanetary magnetodisc in a context of other types of astrophysical discs

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf....4b&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.4

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Scientific paper

The accreting ionized gas surrounding a neutron star or a white dwarf creates an accretion disc. For definite parameters of the system, radius RA (the Alfven radius), where the magnetic energy density is equal to the kinetic energy density, is close to the inner boundary of disc, there plasma leaves the accretion disc and flows to the central object. Accretion disc in a binary system will be disrupted at a radius RA. The heliospheric current sheet's inner edge is also located at the Alfven radius. The same is true for discs in the magnetospheres of giant planets of the solar system - Jupiter and Saturn: their inner edges are located at the Alfven radii. Due to the starexoplanet interaction, a magnetosphere arises around a magnetized planet placed in close orbit about the host star ("Hot Jupiter"). In the equatorial plane of exoplanet's magnetosphere a magnetodisc could be formed by thermal expansion and mass loss of the planetary atmosphere heated by stellar XUV with the consequent ionization of the expanded gas. The distance to disc's inner edge determines the disc's magnetic moment, the total magnetospheric magnetic field, and the size of magnetosphere. Here we pay attention to the fact that the Hot Jupiter's disc inner edge location at RA [3] coincides with locations of the inner edges (roughly at the Alfven radii) of some other astrophysical discs (for definite parameters of the system included them) independent of a nature of their origin and of the direction of motion in the discs, which means that in such discs the kinetic energy density exceeds the magnetic field energy density.

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