= Hot Jupiter
{wiki}
A <hot Jupiter> is a giant <exoplanet> with a short <orbital period> and strong stellar <irradiance>, typically orbiting much closer to its <star> than <Mercury> orbits the <Sun>. Large <radius> and short <orbital period> make these bodies favourable for <exoplanet transit photometry>; large <mass> and small orbital separation also increase the <stellar radial-velocity semi-amplitude>.
Strong external heating makes an <exoplanet atmosphere> very different from that of <Jupiter>. <Tidal locking> can maintain nearly permanent illuminated and dark hemispheres, creating a large driving force for <day-night heat redistribution>. <HD 209458 b> illustrates <transit spectroscopy>, while <HD 189733 b> illustrates an <exoplanet thermal phase curve>. Their proximity to their <stars> also motivates <planetary migration> models: present orbital location need not be the location of formation.
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