Journal
PLANETARY AND SPACE SCIENCE
Volume 97, Issue -, Pages 43-49Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pss.2014.04.003
Keywords
Giant gaseous extrasolar planets; Contraction timescales
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Funding
- Science and Technology Facilities Council [ST/J001546/1] Funding Source: researchfish
- STFC [ST/J001546/1] Funding Source: UKRI
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For extrasolar planets with well determined radii and in thermal equilibrium, the planetary luminosity can be determined. A plot of the log of the luminosity against the log of the effective temperature of the planet was constructed. It was found that the gas giant planets lie on a narrow band that could be well fitted by a linear regression relation between log(10)L and log(10)T(eff) with a slope of 5.46. A model of contracting gas giants that is also receiving energy from the parent star is constructed and the contraction time calculated and the results compared to those by numerical integration. This time is far too long for giant planets due to the parent star, showing that they must initially contract further out before migrating inwards. (C) 2014 Elsevier Ltd. All rights reserved.
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