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The Intrinsic Temperature and Radiative-Convective Boundary Depth in the Atmospheres of Hot Jupiters | Daniel P. Thorngren
; Peter Gao
; Jonathan J. Fortney
; | Date: |
17 Jul 2019 | Abstract: | In giant planet atmosphere modelling, the intrinsic temperature
$T_mathrm{int}$ and radiative-convective boundary (RCB) are important lower
boundary conditions. Often in one-dimensional radiative-convective models and
in three-dimensional general circulation models it is assumed that
$T_mathrm{int}$ is similar to that of Jupiter itself, around 100 K, which
yields a RCB around 1 kbar for hot Jupiters. In this work, we show that the
inflated radii, and hence high specific entropy interiors, of hot Jupiters
suggest much higher $T_mathrm{int}$ values. Assuming the effect is primarily
due to current heating (rather than delayed cooling), we derive an equilibrium
relation between $T_mathrm{eq}$ and $T_mathrm{int}$, showing that the latter
can take values as high as 700 K. In response, the RCB moves upward in the
atmosphere. Using one-dimensional radiative-convective atmosphere models, we
find RCBs of only a few bars, rather than the kilobar typically supposed. This
much shallower RCB has important implications for the atmospheric structure,
vertical and horizontal circulation, interpretations of phase curves, and the
effect of deep cold traps on cloud formation. | Source: | arXiv, 1907.7777 | Services: | Forum | Review | PDF | Favorites |
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