HIGH-TEMPERATURE PHOTOCHEMISTRY IN THE ATMOSPHERE OF HD 189733b

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50729

Title:	HIGH-TEMPERATURE PHOTOCHEMISTRY IN THE ATMOSPHERE OF HD 189733b
Authors:	Line,MR;Liang,MC;Yung,YL
Contributors:	天文研究所
Keywords:	EXTRASOLAR GIANT PLANETS;BROWN DWARFS;DAYSIDE SPECTRUM;CARBON-MONOXIDE;HOT JUPITERS;CHEMISTRY;209458B;MODEL;DECOMPOSITION;CONSTRAINTS
Date:	2010
Issue Date:	2012-03-27 18:08:53 (UTC+8)
Publisher:	國立中央大學
Abstract:	Recent infrared spectroscopy of hot exoplanets is beginning to reveal their atmospheric composition. Deep within the planetary atmosphere, the composition is controlled by thermochemical equilibrium. Photochemistry becomes important higher in the atmosphere, at levels above similar to 1 bar. These two chemistries compete between similar to 1 and 10 bars in hot-Jupiter-like atmospheres, depending on the strength of the eddy mixing and temperature. HD 189733b provides an excellent laboratory in which to study the consequences of chemistry of hot atmospheres. The recent spectra of HD 189733b contain signatures of CH(4), CO(2), CO, and H(2)O. Here we identify the primary chemical pathways that govern the abundances of CH(4), CO(2) , CO, and H(2)O in the cases of thermochemical equilibrium chemistry, photochemistry, and their combination. Our results suggest that the disequilibrium mechanisms can significantly enhance the abundances of these species above their thermochemical equilibrium value, so some caution must be taken when assuming that an atmosphere is in strict thermochemical equilibrium.
Relation:	ASTROPHYSICAL JOURNAL
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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