Hot Jupiter Variability in Eclipse Depth

Details Hot Jupiter Variability in Eclipse Depth Hot Jupiter Variability in Eclipse Depth

2006-12-14

arxiv.org/abs/astro-ph/0612413v2

Astronomy and Astrophysics

Astrophysics

13 pages, 3 figures, 2 tables, accepted for publication in ApJ Letters

Scientific paper

10.1086/519374

Physical conditions in the atmospheres of tidally-locked, slowly-rotating hot Jupiters correspond to dynamical circulation regimes with Rhines scales and Rossby deformation radii comparable to the planetary radii. Consequently, the large spatial scales of moving atmospheric structures could generate significant photospheric variability. Here, we estimate the level of thermal infrared variability expected in successive secondary eclipse depths, according to hot Jupiter turbulent ``shallow-layer'' models. The variability, at the few percent level or more in models with strong enough winds, is within the reach of Spitzer measurements. Eclipse depth variability is thus a valuable tool to constrain the circulation regime and global wind speeds in hot Jupiter atmospheres.

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