James Y-K. Cho et al 2003 ApJ 587 L117 doi:10.1086/375016
James Y-K. Cho1,2, Kristen Menou3,4,5, Bradley M. S. Hansen3,6,7 and Sara Seager2,8
Show affiliationsHigh-resolution atmospheric flow simulations of the tidally locked extrasolar giant planet HD 209458b show large-scale spatio-temporal variability. This is in contrast to the simple, permanent day/night (i.e., hot/cold) picture. The planet's global circulation is characterized by a polar vortex in motion around each pole and a banded structure corresponding to approximately three broad zonal (east-west) jets. For very strong jets, the circulation-induced temperature difference between moving hot and cold regions can reach up to ~1000 K, suggesting that atmospheric variability could be observed in the planet's spectral and photometric signatures.
planetary systems; planets and satellites: general; stars: atmospheres; turbulence
Issue 2 (2003 April 20)
Received 2002 September 11, accepted for publication 2003 February 28
Published 2003 March 20
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