Asteroseismic inference on rotation, gyrochronology and planetary system dynamics of 16 Cygni
García, R. A.; Chaplin, W. J.; Lund, M. N.; Stello, D.; Handberg, R.; Elsworth, Y.; Mathis, S.; Davies, G. R.; Appourchaux, T.; Metcalfe, T. S.; Benomar, O.; Salabert, D.; Farr, W. M.; Basu, S.; Campante, T. L.; Ceillier, T.
France, United Kingdom, Denmark, United States, Japan, Australia
Abstract
The solar analogues 16 Cyg A and B are excellent asteroseismic targets in the Kepler field of view and together with a red dwarf and a Jovian planet form an interesting system. For these more evolved Sun-like stars we cannot detect surface rotation with the current Kepler data but instead use the technique of asteroseimology to determine rotational properties of both 16 Cyg A and B. We find the rotation periods to be 23.8^{+1.5}_{-1.8} and 23.2^{+11.5}_{-3.2} d, and the angles of inclination to be 56^{+6}_{-5}° and 36^{+17}_{-7}°, for A and B, respectively. Together with these results we use the published mass and age to suggest that, under the assumption of a solar-like rotation profile, 16 Cyg A could be used when calibrating gyrochronology relations. In addition, we discuss the known 16 Cyg B star-planet eccentricity and measured low obliquity which is consistent with Kozai cycling and tidal theory.