The Consistent Modeling of Alkali Lines and Dust Formation in Extreme Exo-Planets

C. M. S. Johnas, Christiane Helling, S. Witte, M. Dehn, Peter Woitke, P. H. Hauschildt

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We present the first PHOENIX (Hauschildt and Baron 1999) model atmosphere results for extreme exo-planets where we have coupled a detailed modeling of the alkali line profiles (Johnas et al. 2006) with non-equilibrium treatment of the chemically heterogeneous dust clouds (DRIFT) (Helling et al. 2007). Our investigation of the Na I D and KI lines show strong differences in shape and depth of the line profiles compared to commonly used impact approximated van der Waals profiles and a previously approximative dust treatment in PHOENIX. Such previous attempts of treating dust in phase equilibrium lead to a much stronger element, depletion of the atmospheric gas. Consequently, the modelling of dust formation processes does influence the spectral pseudo-continuum which is determined by the resonance absorption wings of the alkali lines.

Original languageEnglish
Title of host publicationExtreme solar systems
Subtitle of host publicationproceedings of a conference held on Santorini Island, Greece, 25-29 June 2007
EditorsD Fischer, FA Rasio, SE Thorsett, A Wolszczan
Place of PublicationSan Francisco
PublisherAstronomical Society of the Pacific
Number of pages4
ISBN (Print)978-1-58381-666-0
Publication statusPublished - 2008
EventConference on Extreme Solar Systems - Santorini
Duration: 25 Jun 200729 Jun 2007


ConferenceConference on Extreme Solar Systems


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