Synchronization Timescales for Three Solar-Type Stars That Have Jupiter-Mass Companions in Short-Period Orbits

Details Synchronization Timescales for Three Solar-Type Stars That Have Jupiter-Mass Companions in Short-Period Orbits Synchronization Timescales for Three Solar-Type Stars That Have Jupiter-Mass Companions in Short-Period Orbits

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115.2122d&link_type=abstract

The Astronomical Journal, Volume 115, Issue 5, pp. 2122-2124.

Astronomy and Astrophysics

Astronomy

11

Stars: Planetary Systems, X-Rays

Scientific paper

We examine the physical properties of the three currently known star-plus-planet systems that have orbital periods of ~3-5 days (51 Peg, upsilon And, and tau Boo). The observed properties are, in general, more consistent with the Zahn viscous dissipation mechanism than with the Tassoul hydrodynamic spin-down mechanism (at least in the latter's present formulation). However, a comparison of the data for tau Boo with the Zahn theory suggests that the predicted synchronization timescale t_Z might be regarded as an upper limit to the actual time needed to synchronize the outer convective layers, and that the latter may actually be shorter than t_Z by a factor of >=3.

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