Query : 2008A&A...483L..25L

2008A&A...483L..25L - Astronomy and Astrophysics, volume 483, L25-28 (2008/6-1)

Persistent circumpolar vortices on the extrasolar giant planet HD 37605 b.


Abstract (from CDS):

We examine the atmospheric dynamics on the extrasolar gas giant HD 37605 b (P=54.2d). As this planet's orbit is highly eccentric (e=0.737), the intensity of stellar heating varies by a factor of 40 over the course of an orbit. We also consider the effect of cloud formation on the dynamical flows and the temperature evolution resulting from this extremely variable forcing. We employ a grid-based two-dimensional compressible hydrodynamics code to model the atmosphere of the extrasolar giant planet HD 37605 b. We use a resolution of 512 longitude gridpoints and 257 latitude gridpoints. The stellar heating is simulated using a one-layer, two-frequency, two-stream approximation to true radiative transfer. This time-dependent insolation causes the formation of circumpolar vortices near both poles. These vortices appear to be stable over many orbits, and sequester a large volume of cold air, effectively shielding their interiors from the full blast of irradiation at periastron. Evolution of tracers initially placed within these vortices shows the rate of exchange of material between the interior and exterior of these vortices is small: material initially inside the vortex can be expected to remain in the vortex for ∼2P. We note that this result is contingent upon a cloudless atmosphere; the formation of clouds potentially causes a large reduction in both temperature variation and wind speed.

Abstract Copyright:

Journal keyword(s): stars: planetary systems - hydrodynamics - turbulence

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 HD 17156b Pl 02 49 44.4866941172 +71 45 11.632197644           ~ 170 1
2 HD 37605b Pl 05 40 01.7280924476 +06 03 38.074320708           ~ 36 1
3 HD 80606b Pl 09 22 37.5769478105 +50 36 13.434928660           ~ 298 1
4 HD 147506b Pl 16 20 36.3579144486 +41 02 53.109043943           ~ 229 1
5 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1673 1

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