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Title: Why are many hot Jupiters larger than models predict?
Plain: Strongly heated giant planets are often puffier than any standard cooling model allows. Some extra heat must be deposited deep inside them.
Precise: Hot Jupiters receiving incident flux $F > \sim 2x10^{8}\,\mathrm{erg}/\mathrm{s}/\mathrm{cm}^{2}$ have radii up to $\sim 2\,\text{Jupiter radii}$, exceeding standard evolution models. Identify the mechanism that deposits heat in the interior: Ohmic dissipation, tidal heating, downward advection of heat by atmospheric circulation, or delayed contraction, by matching the radius anomaly versus $F$, planet mass and age.
Settled by: Measurement of the radius anomaly versus incident flux and age, including planets whose host stars have brightened (re-inflation test), compared with each mechanism's prediction.
Kind: phenomenon
Answer type: mechanism
References: (empty)
Literature status: open
Status note: (empty)
Posed since: 2001