Accretion shocks as evidence of extrasolar planets

Physics

Scientific paper

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Extrasolar Planets, Planetary Mass, Red Giant Stars, Shock Wave Interaction, Stellar Evolution, Stellar Winds, Drag, Earth Magnetosphere, Gas Heating, Gravitational Effects, Interstellar Gas, Jupiter (Planet), Luminosity, Planetary Atmospheres, Planetary Gravitation, Planetary Orbits, Shock Heating, Stellar Envelopes, Stellar Mass Ejection

Scientific paper

If planets occur around intermediate mass stars (one or two solar masses) then some time during evolution they may be engulfed by a stellar wind or an expanding envelope as the star evolves into a red giant. Interaction of the outflowing material may have an observable interaction with the planet. Shock structures resulting from gravitational accretion drag, geometric drag and accretion might be observed at luminosities up to 10 to the 23rd W (.001 solar luminosity). For a planet with the mass of Jupiter, the shock temperatures lead to collisional cooling of the gas and to emergent UV line radiation at the source. If plasma conditions are realised and the planet has a magnetic field then there is the possibility of the radiation being pulsed by a magnetospheric gate process. These processes may lead to a method of indirect detection of planets.

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