Asteroseismic constraints on active latitudes of solar-type stars: HD173701 has active bands at higher latitudes than the Sun
arXiv:1903.04998 · doi:10.1093/mnras/stz672
Abstract
We present a new method for determining the location of active bands of latitude on solar-type stars, which uses stellar-cycle-induced frequency shifts of detectable solar-like oscillations. When near-surface activity is distributed in a non-homogeneous manner, oscillation modes of different angular degree and azimuthal order will have their frequencies shifted by different amounts. We use this simple concept, coupled to a model for the spatial distribution of the near-surface activity, to develop two methods that use the frequency shifts to infer minimum and maximum latitudes for the active bands. Our methods respond to the range in latitude over which there is significant magnetic flux present, over and above weak basal ephemeral flux levels. We verify that we are able to draw accurate inferences in the solar case, using Sun-as-a-star helioseismic data and artificial data. We then apply our methods to Kepler data on the solar analogue HD173701, and find that its active bands straddle a much wider range in latitude than do the bands on the Sun.
arXiv comment13 pages, 15 figures, MNRAS accepted
References in corpus (29)
- emcee: The MCMC Hammer
- Standing on the shoulders of Dwarfs: the asteroseismic LEGACY sample I - oscillation mode parameters
- CoRoT reveals a magnetic activity cycle in a Sun-like star
- Testing the recovery of stellar rotation signals from Kepler light curves using a blind hare-and-hounds exercise
- Bayesian peak-bagging of solar-like oscillators using MCMC: A comprehensive guide
- Automated preparation of Kepler time series of planet hosts for asteroseismic analysis
- Asteroseismic inference on rotation, gyrochronology and planetary system dynamics of 16 Cygni
- Magnetic field topology of the unique chemically peculiar star CU Virginis
- A small survey of the magnetic fields of planet-host stars
- The extraordinary complex magnetic field of the helium-strong star HD 37776
- The influence of metallicity on stellar differential rotation and magnetic activity
- Comparing different approaches to model the rotational modulation of the Sun as a star
- Performance of the Birmingham Solar-Oscillations Network (BiSON)
- Stellar magnetic activity and variability of oscillation parameters - An investigation of 24 solar-like stars observed by Kepler
- Seismic sensitivity to sub-surface solar activity from 18 years of GOLF/SoHO observations
- Magnetic variability in the young solar analog KIC 10644253: Observations from the Kepler satellite and the HERMES spectrograph
- Signatures of magnetic activity in the seismic data of solar-type stars observed by Kepler
- Activity and Magnetic Field Structure of the Sun-Like Planet Hosting Star HD 1237
- Starspot signature on the light curve: Learning about the latitudinal distribution of spots
- On the frequency dependence of p-mode frequency shifts induced by magnetic activity in Kepler solar-like stars
- Magnetic activity cycles in solar-like stars: The cross-correlation technique of p-mode frequency shifts
- Validation of solar-cycle changes in low-degree helioseismic parameters from the Birmingham Solar-Oscillations Network
- Latitude Distribution of Sunspots: Analysis Using Sunspot Data and A Dynamo Model
- Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712 II. Two-dimensional Magnetic Doppler Imaging in all four Stokes parameters
- Parametrizing the time-variation of the "surface term" of stellar p-mode frequencies: application to helioseismic data
- Butterfly diagram of a Sun-like star observed using asteroseismology
- On the contribution of sunspots to the observed frequency shifts of solar acoustic modes
- Sounding the Solar Cycle with Helioseismology: Implications for Asteroseismology
- Magnetic fields of Sun-like stars
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- Recovery of TESS Stellar Rotation Periods Using Deep Learning
- Impact of magnetic activity on inferred stellar properties of main sequence Sun-like stars
- Kepler main-sequence solar-like stars: surface rotation and magnetic-activity evolution
- Empirical Relations for the Sensitivities of Solar-like Oscillations to Magnetic Perturbations
- Flaring Latitudes in Ensembles of Low Mass Stars
- Frequency separation ratios do not suppress magnetic activity effects in solar-like stars
- Lifetimes and Rotation within the Solar Mean Magnetic Field
- HAYDN -- High-precision AsteroseismologY of DeNse stellar fields (ESA Voyage 2050 White Paper)