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Hot Jupiters and the evolution of stellar angular momentum

Published online by Cambridge University Press:  10 November 2011

Cilia Damiani  and
Antonino F. Lanza
Cilia Damiani
Affiliation:
INAF-Osservatorio Astrofisico di Catania, Via Santa Sofia, 78, 95123, Catania, Italy email: damiani@oact.inaf.it
Antonino F. Lanza
Affiliation:
INAF-Osservatorio Astrofisico di Catania, Via Santa Sofia, 78, 95123, Catania, Italy email: damiani@oact.inaf.it
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Abstract

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A close-in massive planet affects the angular momentum of its host star through tidal and magnetic interactions. The transiting planets allow us to study the distribution of the spin and orbital angular momenta in star-planet systems. Considering a sample of about 70 systems, we find that stars having an effective temperature between 6000 and 6700 K and a rotation period shorter than 10 days show a rotation synchronized with the orbit of their hot Jupiters or have a rotation period twice the orbital period of their planets. Such rotational behaviours cannot be explained on the basis of tidal interactions alone. Besides, the gyrochronology relationship for those systems holds if an angular momentum loss rate smaller by about 30 percent than in stars without hot Jupiters is assumed.

Keywords

planetary systemsplanet-star interactionsstars: rotation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S276: The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution , October 2010 , pp. 499 - 500
Copyright
Copyright © International Astronomical Union 2011

References

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