Rotation periods and seismic ages of KOIs - comparison with stars without detected planets from Kepler observations

TL;DR

This study measures rotation periods and ages of old, solar-like stars with and without planets using Kepler data and asteroseismology, aiding the calibration of stellar age estimation methods for mature stars.

Contribution

It provides new rotation and age data for old KOIs, comparing planet-hosting stars with non-planet hosts to improve gyrochronology calibration.

Findings

Planet-hosting stars show rotation consistent with age-rotation models.

Old KOIs can be used to calibrate gyrochronology.

Rotation behavior of stars with and without planets is similar.

Abstract

One of the most difficult properties to derive for stars is their age. For cool main-sequence stars, gyrochronology relations can be used to infer stellar ages from measured rotation pe- riods and HR Diagram positions. These relations have few calibrators with known ages for old, long rotation period stars. There is a significant sample of old Kepler objects of inter- est, or KOIs, which have both measurable surface rotation periods and precise asteroseismic measurements from which ages can be accurately derived. In this work we determine the age and the rotation period of solar-like pulsating KOIs to both compare the rotation properties of stars with and without known planets and enlarge the gyrochronology calibration sample for old stars. We use Kepler photometric light curves to derive the stellar surface rotation peri- ods while ages are obtained with asteroseismology using the Asteroseismic Modeling Portal in which individual mode frequencies are combined with high-resolution spectroscopic pa- rameters. We thus determine surface rotation periods and ages for 11 planet-hosting stars, all over 2 Gyr old. We find that the planet-hosting stars exhibit a rotational behaviour that is consistent with the latest age-rotation models and similar to the rotational behaviour of stars without detected planets. We conclude that these old KOIs can be used to test and calibrate gyrochronology along with stars not known to host planets.