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Dynamic Meteorology at the Photosphere of HD 209458b

By SpaceRef Editor
May 3, 2005
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Astrophysics, abstract

From: Curtis S. Cooper [view email]
Date: Wed, 23 Feb 2005 14:57:11 GMT (373kb)

Dynamic Meteorology at the Photosphere of HD 209458b

Curtis S. Cooper,
Adam P. Showman

Comments: Submitted to ApJ Letters

We calculate the meteorology of the close-in transiting extrasolar planet HD
209458b using a global, three-dimensional atmospheric circulation model.
Dynamics are driven by perpetual irradiation of one hemisphere of this tidally
locked planet. The simulation predicts global temperature contrasts of ~470 K
at the photosphere and the development of a steady superrotating jet. The jet
extends from the equator to mid-latitudes and from the top model layer at 1
mbar down to 10 bars at the base of the heated region. Equatorial wind speeds
exceed 3 km/s at 300 mbar. The hottest regions of the atmosphere are blown
downstream from the substellar point by ~60 degrees of longitude. We predict
from these results a 1.7 +/- 0.4 ratio between the maximum and minimum observed
radiation from the planet over a full orbital period, with peak infrared
emission preceding the time of the secondary eclipse by 14 +/- 5 hours.

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