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Planetary Transits and Tidal Evolution

Published online by Cambridge University Press:  01 May 2008

Brian Jackson ,
Rory Barne  and
Richard Greenberg
Brian Jackson
Affiliation:
Lunar and Planetary Laboratory, University of Arizona1629 E University Blvd, Tucson AZ 85721-0092USA email: [email protected]
Rory Barne
Affiliation:
Lunar and Planetary Laboratory, University of Arizona1629 E University Blvd, Tucson AZ 85721-0092USA email: [email protected]
Richard Greenberg
Affiliation:
Lunar and Planetary Laboratory, University of Arizona1629 E University Blvd, Tucson AZ 85721-0092USA email: [email protected]
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Abstract

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Transiting planets are generally close enough to their host stars that tides may govern their orbital and thermal evolution. We present calculations of the tidal evolution of recently discovered transiting planets and discuss their implications. The tidal heating that accompanies this orbital evolution can be so great that it controls the planet's physical properties and may explain the large radii observed in several cases, including, for example, TrES-4. Also, since a planet's transit probability depends on its orbit, it evolves due to tides. Current values depend sensitively on the physical properties of the star and planet, as well as on the system's age. As a result, tidal effects may introduce observational biases in transit surveys, which may already be evident in current observations. Transiting planets tend to be younger than non-transiting planets, an indication that tidal evolution may have destroyed many close-in planets. Also the distribution of the masses of transiting planets may constrain the orbital inclinations of non-transiting planets.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S253: Transiting Planets , May 2008 , pp. 217 - 229
Copyright
Copyright © International Astronomical Union 2009

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