Asteroseismic inference on rotation, gyrochronology and planetary system dynamics of 16 Cygni. Issue 3 (29th November 2014) - Davies, G. R.
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 $23.2^{+11.5}_{-3.2} \rm \, d$, and the angles of inclination to be $56^{+6}_{-5} \, ^{\circ }$ and $36^{+17}_{-7} \, ^{\circ }$, 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.