Asteroseismic inference on rotation, gyrochronology and planetary system dynamics of 16 Cygni
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 Sunlike 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 solarlike rotation profile, 16 Cyg A could be used when calibrating gyrochronology relations. In addition, we discuss the known 16 Cyg B starplanet eccentricity and measured low obliquity which is consistent with Kozai cycling and tidal theory.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 January 2015
 DOI:
 10.1093/mnras/stu2331
 arXiv:
 arXiv:1411.1359
 Bibcode:
 2015MNRAS.446.2959D
 Keywords:

 planetstar interactions;
 stars: oscillations;
 stars: rotation;
 Astrophysics  Solar and Stellar Astrophysics
 EPrint:
 10 pages accepted for publication in the MNRAS