The relative role of EUV radiation and X-rays in the heating of hydrogen-rich exoplanet atmospheres

Details The relative role of EUV radiation and X-rays in the heating of hydrogen-rich exoplanet atmospheres The relative role of EUV radiation and X-rays in the heating of hydrogen-rich exoplanet atmospheres

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...496..863c&link_type=abstract

Astronomy and Astrophysics, Volume 496, Issue 3, 2009, pp.863-868

Astronomy and Astrophysics

Astrophysics

11

Stars: Planetary Systems, Ultraviolet: Stars, X-Rays: Stars, Radiative Transfer

Scientific paper

Aims: We study the relative role of EUV and X-ray radiation in the heating of hydrogen-rich planet atmospheres with different composition and electron content. Methods: An accurate photo-ionization model has been used to follow the primary photo-electron energy deposition throughout the atmosphere. Results: Heating rates and efficiencies have been computed, together with column density cut-offs at which photons of given energies stop their heating production inside the atmosphere. Assuming 100 eV as the energy borderline between the extreme ultraviolet spectral range and X-rays we find that when the absorbing hydrogen column density is higher than 1020 cm-2 only X-rays can heat the gas. Extreme ultraviolet photons heat the upper atmospheric layers. Conclusions: Using emission spectra from a sample of solar-type stars of different ages representative of the Sun's main sequence lifetime, we have derived the corresponding heating rates. We find that the existence of an energetic cross-over in atmospheric heating is present for all stars in the sample.

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