A comparison of gyrochronological and isochronal age estimates for transiting exoplanet host stars

摘要: Previous studies suggest that tidal interactions may be responsible for discrepancies between the ages of exoplanet host stars estimated using stellar models (isochronal ages) and age estimates based on stars' rotation periods (gyrochronological ages). We have compiled a sample 28 transiting with measured periods. use Bayesian Markov chain Monte Carlo method to determine joint posterior distribution mass each star in sample, extend this include calculation gyrochronological age. The ($\tau_{\rm gyro}$) is significantly less than isochronal about half our sample. Tidal planet are reasonable explanation discrepancy some cases, but not all. $\tau_{\rm gyro}$ values evenly spread from very young up maximum value few Gyr. There no clear correlation strength force due innermost planet. evidence K-type too large, also case G-type stars. This result magnetic inhibition convection. currently satisfactory CoRoT-2 either gyrochronology or its high lithium abundance, extremely old companion inferred low X-ray flux. now strong their ages, it always good