Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...458l..13c&link_type=abstract
Astronomy and Astrophysics, Volume 458, Issue 2, November I 2006, pp.L13-L16
Astronomy and Astrophysics
Astrophysics
11
Planetary Systems, X-Rays: Stars, Radiative Transfer
Scientific paper
Aims.To investigate the effects of the stellar X-ray irradiation on planet atmospheres, we study the X-ray transfer and energy deposition in a hydrogen rich gas. Methods: .We construct an accurate X-ray transfer model taking both photoionization and Compton scattering into account; the electron energy deposition is followed by tracking the discrete exchange processes between electrons and the gas mixture. Results: .Exospheric heating rates are derived as functions of the pressure in model atmospheres using a wide range of X-ray luminosity, spectral hardness representative of different stellar ages, and distances from the parent star. The computed heating rates suggest that X-ray irradiation might be an important heating source in planetary exospheres even at large distances from the parent star.
Cecchi-Pestellini Cesare
Ciaravella Angela
Micela Giuseppina
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