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Patrick Cassam-Chenaï

Description

•First •Prev •Next •Last •Go Back •Full Screen •Close •Quit From planetology to Hopf algebra, a quantum chemistry story Patrick CASSAM-CHENAI Laboratoire J. A. Dieudonne, Universite de Nice-Sophia-Antipolis Nice, Novembre 2005

• red wavelengths


• rotch4 rotch4


• representative synthetic spectra


• em per


• shows red


• absorption spectrum


• infrared mapping


• nh3


• jupiter's atmosphere


• ph3 ph3

Sujets

• Absorption spectroscopy

Informations

• Publié par: pefav
• Publié le: 01 novembre 2005
• Nombre de lectures: 13
• Langue: English

Extrait

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Nice, Novembre 2005

¨ Patrick CASSAM-CHENAI

From planetology to Hopf algebra, a

LaboratoireJ.A.Dieudonn´e,Universit´edeNice-Sophia-Antipolis

quantum chemistry story

rP • tsriF • oB • GstLat • ex • NevesoliuQ • tk • acllFureSc • Cen

Deficiencies of spectroscopic databases for planetology - I

“The methane opacity dominates the infrared spectrum of Jupiter and other outer planets. This is readily apparent in the Jovian spectra recorded by the Visible and Infrared Mapping Spectrometer on the Cassini spacecraft. The CH 4 abundances are even greater in the more distant outer planets and Titan.” Spectrosc.L. R. Brown, J. Quant. Radiat. Transfer96, 251-270 (2005).

However in the latest version of the HITRAN database:

•Only 1% of the 40256 features of methane between 1.1-1.6 and 1.8-2.1 µm are assigned =⇒one cannot extrapolate the 296K (room tempera- ture) spectra to 50K (typical outer planet atmosphere temperature) or 1000K (typical T-Brown Dwarf temperature)

•Without these lines, error bar on the opacity of T-brown dwarf atmo- spheres =⇒factor 2 uncertainty on the age and size of these objects!

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