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Do falling planets cause stellar spin-up?

Published online by Cambridge University Press:  10 November 2011

D. J. A. Brown ,
A. Collier Cameron ,
C. Hall  and
L. Hebb
D. J. A. Brown
Affiliation:
SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, UK. email: djab@st-andrews.ac.uk
A. Collier Cameron
Affiliation:
SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, UK. email: djab@st-andrews.ac.uk
C. Hall
Affiliation:
SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, UK. email: djab@st-andrews.ac.uk
L. Hebb
Affiliation:
SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, UK. email: djab@st-andrews.ac.uk
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Abstract

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We investigate the tidal interactions between hot Jupiter extra-solar planets and their host stars in an effort to characterise the effects of such interactions on stellar rotation. We study the WASP-18 and WASP-19 systems, showing that in both cases tidal interactions cause the eventual spiral in of the the planet towards the Roche limit. We find that for both systems this process will cause significant spin up of the host star, independent of the precise value for the tidal quality factors. By fitting tidal evolution models to observed parameters, we are able to determine that WASP-19 b is currently spiralling in, and that it has a very short remaining lifetime ~ 3 Myr.

Keywords

stars: rotationstars: activityplanetary systems
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. 267 - 270
Copyright
Copyright © International Astronomical Union 2011

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