2008ApJ...675L.105H -
Astrophys. J., 675, L105-L108 (2008/March-2)
Consistent simulations of substellar atmospheres and nonequilibrium dust cloud formation.
HELLING C., DEHN M., WOITKE P. and HAUSCHILDT P.H.
Abstract (from CDS):
We aim to understand cloud formation in substellar objects. We combined our nonequilibrium, stationary cloud model DRIFT (seed formation, growth, evaporation, gravitational settling, element conservation) with the general-purpose model atmosphere code PHOENIX (radiative transfer, hydrostatic equilibrium, mixing-length theory, chemical equilibrium) in order to consistently calculate cloud formation and radiative transfer with their feedback on convection and gas-phase depletion. We calculate the complete 1D model atmosphere structure and the chemical details of the cloud layers. The DRIFT-PHOENIX models enable the first stellar atmosphere simulation that is based on the actual cloud formation process. The resulting (T, p)-profiles differ considerably from the previous limiting PHOENIX cases DUSTY and COND. A tentative comparison with observations demonstrates that the determination of effective temperatures based on simple cloud models has to be applied with care. Based on our new models, we suggest a mean Teff= 1800 K for the L dwarf twin-binary system DENIS J0205-1159, which is up to 500 K hotter than suggested in the literature. We show transition spectra for gas-giant planets which form dust clouds in their atmospheres and evaluate photometric fluxes for a WASP-1 type system.
Abstract Copyright:
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Journal keyword(s):
Astrochemistry - Methods: Numerical - Stars: Atmospheres
Errata:
erratum vol. 677, p. L157 (2008)
Simbad objects:
6
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