EUV-driven mass-loss of protoplanetary cores with hydrogen-dominated atmospheres: the influences of ionization and orbital distance

Тип публикации: статья из журнала

Год издания: 2016

Идентификатор DOI: 10.1093/mnras/stw935

Ключевые слова: hydrodynamics, planets and satellites: atmospheres, planets and satellites: physical evolution, ultraviolet: planetary systems, Hydrodynamics, Planets and satellites: atmospheres, Planets and satellites: physical evolution, Ultraviolet: planetary systems

Аннотация: We investigate the loss rates of the hydrogen atmospheres of terrestrial planets with a range of masses and orbital distances by assuming a stellar extreme ultraviolet (EUV) luminosity that is 100 times stronger than that of the current Sun. We apply a 1D upper atmosphere radiation absorption and hydrodynamic escape model that takes into account ionization, dissociation and recombination to calculate hydrogen mass-loss rates. We study the effects of the ionization, dissociation and recombination on the thermal mass-loss rates of hydrogen-dominated super-Earths and compare the results to those obtained by the energy-limited escape formula which is widely used for mass-loss evolution studies. Our results indicate that the energy-limited formula can to a great extent over- or underestimate the hydrogen mass-loss rates by amounts that depend on the stellar EUV flux and planetary parameters such as mass, size, effective temperature and EUV absorption radius.

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Издание

Журнал: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

Выпуск журнала: Vol. 460, Is. 2

Номера страниц: 1300-1309

ISSN журнала: 00358711

Место издания: OXFORD

Издатель: OXFORD UNIV PRESS

Авторы

  • Erkaev N.V. (Siberian Federal University)
  • Lammer H. (Space Research Institute,Austrian Academy of Sciences)
  • Odert P. (Space Research Institute,Austrian Academy of Sciences)
  • Kislyakova K.G. (Space Research Institute,Austrian Academy of Sciences)
  • Khodachenko M.L. (Space Research Institute,Austrian Academy of Sciences)
  • Johnstone C.P. (Institute for Astronomy,University of Vienna)
  • Gudel M. (Institute for Astronomy,University of Vienna)

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