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• W1917754518 startingPage "116" @default.
• W1917754518 abstract "The observed radii of many giant exoplanets in close orbits exceed theoretical predictions. One suggested origin for this discrepancy is heat deposited deep inside the atmospheres of these hot Jupiters. Here, we study extended power sources that distribute heat from the photosphere to the deep interior of the planet. Our analytical treatment is a generalization of a previous analysis of localized point sources. We model the deposition profile as a power law in the optical depth and find that planetary cooling and contraction halt when the internal luminosity (i.e., cooling rate) of the planet drops below the heat deposited in the planet's convective region. A slowdown in the evolutionary cooling prior to equilibrium is possible only for sources that do not extend to the planet's center. We estimate the ohmic dissipation resulting from the interaction between the atmospheric winds and the planet's magnetic field, and apply our analytical model to ohmically heated planets. Our model can account for the observed radii of most inflated planets, which have equilibrium temperatures of ≈1500–2500 K and are inflated to a radius of . However, some extremely inflated planets remain unexplained by our model. We also argue that ohmically inflated planets have already reached their equilibrium phase, and no longer contract. Following Wu & Lithwick, who argued that ohmic heating could only suspend and not reverse contraction, we calculate the time it takes ohmic heating to re-inflate a cold planet to its equilibrium configuration. We find that while it is possible to re-inflate a cold planet, the re-inflation timescales are longer by a factor of than the cooling time." @default.
• W1917754518 created "2016-06-24" @default.
• W1917754518 creator A5023276561 @default.
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• W1917754518 date "2016-03-04" @default.
• W1917754518 modified "2023-10-16" @default.
• W1917754518 title "EXTENDED HEAT DEPOSITION IN HOT JUPITERS: APPLICATION TO OHMIC HEATING" @default.
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• W1917754518 doi "https://doi.org/10.3847/0004-637x/819/2/116" @default.
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