A map of the day–night contrast of the extrasolar planet HD 189733b

  title={A map of the day–night contrast of the extrasolar planet HD 189733b},
  author={H. Knutson and D. Charbonneau and L. Allen and J. Fortney and E. Agol and N. Cowan and A. Showman and C. Cooper and S. Megeath},
‘Hot Jupiter’ extrasolar planets are expected to be tidally locked because they are close (<0.05 astronomical units, where 1 au is the average Sun–Earth distance) to their parent stars, resulting in permanent daysides and nightsides. By observing systems where the planet and star periodically eclipse each other, several groups have been able to estimate the temperatures of the daysides of these planets. A key question is whether the atmosphere is able to transport the energy incident upon the… Expand
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