Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...21115901l&link_type=abstract
American Astronomical Society, AAS Meeting #211, #159.01
Astronomy and Astrophysics
Astronomy
1
Scientific paper
A number of Jupiters have recently been detected around giant stars including one of the brightest stars in the sky and a well-studied K0 giant, β Gem. Giants stars have cool and massive winds that may affect the magnetospheres of Jupiters and cause a number of observational effects. We show that rescaling of intensities of auroral events observed on Jupiter and Saturn can provide an estimate for UV emission line intensities that can be observed by largest ground-based telescopes and/or space missions. In this study, we model the auroral processes and an evaporation scenario caused by injection of energetic electrons into the outer atmospheres of massive Jupiters located at 1 AU from β Gem. We apply a state-of-the-art combined Fokker-Planck (Leach & Petrosian 1981) and 1-D hydrodynamic (Mariska et al. 1989) code to study, for the first time, the transient effects of injection of energetic electrons with energies > 10 keV heating the atmospheres due to Coulomb collisions. The energetic particles are produced as a result of the interaction between the magnetic fields of the stellar wind and the exoplanetary magnetosphere at the magnetopause or reconnection in the magnetotail. The combined Fokker-Plank and hydrodynamic code is capable of treating particle transport and the hydrodynamic atmospheric response in a self-consistent manner, and has been successfully used to study chromospheric evaporation during solar flares (Liu 2006). We discuss expected fluxes in UV continuum and emission lines and new observations that can be used to search for evaporating Jupiters around stars with high mass-loss rates.
Airapetian Vladimir
Liu Wei
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