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Study of the non-thermal atmospheric loss for exoplanet π Men c

Published online by Cambridge University Press:  20 January 2023

Anastasia A. Avtaeva Open the ORCID record for Anastasia A. Avtaeva [Opens in a new window]  and
Valery I. Shematovich Open the ORCID record for Valery I. Shematovich [Opens in a new window]
Anastasia A. Avtaeva
Affiliation:
Sternberg Astronomical Institute, Moscow State University Universitetsky pr., 13, Moscow 119234, Russia email: nastyaavt@inasan.ru Institute of Astronomy, Russian Academy of Sciences Pyatnitskaya str., 48, Moscow 119017, email: shematov@inasan.ru
Valery I. Shematovich
Affiliation:
Institute of Astronomy, Russian Academy of Sciences Pyatnitskaya str., 48, Moscow 119017, email: shematov@inasan.ru
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Abstract

We have studied the input of the exothermic photochemistry into the formation of the non-thermal escape flux in the transition H2 − H region of the extended upper atmosphere of the hot exoplanet - the sub-neptune π Men c. The formation rate and the energy spectrum of hydrogen atoms formed with an excess of kinetic energy due to the exothermic photochemistry forced by the stellar XUV radiation were calculated using a numerical kinetic Monte Carlo model of a hot planetary corona. The escape flux was estimated to be equal to 2.5×1012 cm−2s−1 for the mean level of stellar activity in the XUV radiation flux. This results in the mean estimate of the atmospheric loss rate due to the exothermic photochemistry equal to 6.7×108 g s−1. The calculated estimate is close to the observational estimates of the possible atmospheric loss rate for the exoplanet π Men c in the range less than 1.0×109 gs−1.

Keywords

exoplanetnumerical modelexoplanets atmospherenon-thermal escape
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S362: The Predictive Power of Computational Astrophysics as a Discovery Tool , June 2020 , pp. 164 - 166
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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References

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