Aeronomy of extra-solar giant planets

R. Yelle, H. Lammer, W. H. Ip

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

The intense stellar UV radiation field incident upon extra-solar giant planets causes profound changes to their upper atmospheres. Upper atmospheric temperatures can be tens of thousands of kelvins, causing thermal dissociation of H2 to H. The stellar ionizing flux converts H to H+. The high temperatures also drive large escape rates of H, but for all but the planets with the smallest orbits, this flux is not large enough to affect planet evolution. The escape rate is large enough to drag off heavier atoms such as C and O. For very small orbits, when the hill sphere is inside the atmosphere, escape is unfettered and can affect planet evolution.

Original languageEnglish (US)
Pages (from-to)437-451
Number of pages15
JournalSpace Science Reviews
Volume139
Issue number1-4
DOIs
StatePublished - Aug 2008

Keywords

  • Aeronomy
  • Atmospheric escape
  • Extra-solar planets

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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