Calibrating gyrochronology using Kepler asteroseismic targets

By R. Angus, Suzanne Aigrain, Daniel Foreman-Mackey, A. McQuillan. 2015

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Among the available methods for dating stars, gyrochronology is a powerful one because it requires knowledge of only the star's mass and rotation period. Gyrochronology relations have previously been calibrated using young clusters, with the Sun providing the only age dependence, and are therefore poorly calibrated at late ages. We used rotation period measurements of 310 Kepler stars with asteroseismic ages, 50 stars from the Hyades and Coma Berenices clusters and 6 field stars (including the Sun) with precise age measurements to calibrate the gyrochronology relation, whilst fully accounting for measurement uncertainties in all observable quantities. We calibrated a relation of the form $P=A^n\times(B-V-c)^b$, where $P$ is rotation period in days, $A$ is age in Myr, $B$ and $V$ are magnitudes and $a$, $b$ and $n$ are the free parameters of our model. We found $a = 0.40^{+0.3}_{-0.05}$, $b = 0.31^{+0.05}_{-0.02}$ and $n = 0.55^{+0.02}_{-0.09}$. Markov Chain Monte Carlo methods were used to explore the posterior probability distribution functions of the gyrochronology parameters and we carefully checked the effects of leaving out parts of our sample, leading us to find that no single relation beween rotation period, colour and age can adequately describe all the subsets of our data. The Kepler asteroseismic stars, cluster stars and local field stars cannot all be described by the same gyrochronology relation. The Kepler asteroseismic stars may be subject to observational biases, however the clusters show unexpected deviations from the predicted behaviour, providing concerns for the overall reliability of gyrochronology as a dating method.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/9871a4888f71249d055cc480b2d04c705b7a7c80

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Citations in the corpus

The GAPS Programme with HARPS-N at TNG - XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets (2017, unknown): “…cases, estimates from gyrochronology and stellar evolutionary tracks agree closely (see e.g. Bonomo et al. 2015), gyrochronological ages may not be accurate, in general (Angus et al. 2015) and because of possible spin-up of the host stars by their close-in planets (Pont 2009; Maxted et al. 2015).”
Inferring probabilistic stellar rotation periods using Gaussian processes (2017, background): “It is important to note, however, that gyrochronology may have limited applicability for galactic field stars: growing evidence points to weakened magnetic braking at late ages (Angus et al. 2015; van Saders et al. 2016).”
Rotation, differential rotation, and gyrochronology of active Kepler stars (2015, methodology): “Recently, efforts are underway to calibrate asteroseismology ages by comparing them to gyrochronology measurements (Garćıa et al. 2014; do Nascimento et al. 2014; Lebreton & Goupil 2014; Angus et al. 2015).”