Quasi-molecular Satellites in the K I Resonance Lines of Brown Dwarfs

Details Quasi-molecular Satellites in the K I Resonance Lines of Brown Dwarfs Quasi-molecular Satellites in the K I Resonance Lines of Brown Dwarfs

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7806h&link_type=abstract

American Astronomical Society Meeting 210, #78.06; Bulletin of the American Astronomical Society, Vol. 39, p.186

Astronomy and Astrophysics

Astronomy

Scientific paper

Optical spectra of brown dwarfs show a shallow absorption feature in the blue wing of the K I resonance doublet near 7000 A, and close to the CaH A2Π-X2Σ band. This feature continues to be observable into the T dwarf range, well below the effective temperature where Ca compounds are expected to be removed from the atmosphere due to condensation and rainout. We show that this observed absorption at slightly longer wavelengths than the CaH band can be reproduced by the quasi-molecular satellite of the K I line with new line profile calculations using improved molecular potentials for the K-H2 interaction.
Using detailed quantum-chemical calculations this spectral feature can thus serve as a powerful diagnostic of temperature and pressure conditions in the deep atmospheres of L/T dwarfs and does not necessarily indicate the presence of gaseous CaH.

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