Current methods for analyzing light curves of solar-like stars

Abstract

CoRoT has allowed a quantitative leap for the solar-like-star seismology thanks to 5-month-long uninterrupted timeseries of high-precision photometric data. Kepler is also starting to deliver similar data. Now, several F and G main-sequence stars have been analyzed. The techniques developed to interpret light curves directly inherit from the experience got on the Sun with helioseismology. I describe in this review the methods currently used to analyze these light curves. First, these data provide an accurate determination of the stellar rotation rate. This is possible thanks to the magnetic activity of stars. The power spectra of light curves put also constraints on the stellar granulation, which can be directly compared to 3-D stellar atmosphere models; this shows still unexplained discrepancies. I then detailed a standard method for extracting p-mode characteristics (frequency, amplitude and lifetime). CoRoT has revealed unexpected short life times for F stars. Last, I also discuss errors and biases of mode frequencies, especially the ones due to the simplified description of the rotation generally used.

7 pages, 4 figures, invited review for the proceedings of the HELAS-IV International Conference, accepted for publication in Astronomische Nachrichten

References in corpus (28)

• Toroidal versus poloidal magnetic fields in Sun-like stars: a rotation threshold
• Determining global parameters of the oscillations of solar-like stars
• On detecting the large separation in the autocorrelation of stellar oscillation times series
• Radius determination of solar-type stars using asteroseismology: What to expect from the Kepler mission
• Constraining fundamental stellar parameters using seismology. Application to Alpha Centauri AB
• Acoustic oscillations of rapidly rotating polytropic stars. II. Effects of the Coriolis and centrifugal accelerations
• A multi-site campaign to measure solar-like oscillations in Procyon. I. Observations, Data Reduction and Slow Variations
• The asteroseismic potential of Kepler: first results for solar-type stars
• The Octave (Birmingham - Sheffield Hallam) automated pipeline for extracting oscillation parameters of solar-like main-sequence stars
• P-mode observations on Alpha Cen A
• The acoustic spectrum of alpha Cen A
• Asteroseismology and calibration of alpha Cen binary system
• Rotation speed and stellar axis inclination from p modes: How CoRoT would see other suns
• Analysis of alpha Centauri AB including seismic constraints
• A multi-site campaign to measure solar-like oscillations in Procyon. II. Mode frequencies
• A fresh look at the seismic spectrum of HD49933: analysis of 180 days of CoRoT photometry
• Short-lived spots in solar-like stars as observed by CoRoT
• The art of fitting p-mode spectra: Part I. Maximum Likelihood Estimation
• Solar-like oscillations with low amplitude in the CoRoT target HD 181906
• Mode lifetimes of stellar oscillations - Implications for asteroseismology
• The CoRoT target HD175726: an active star with weak solar-like oscillations
• The solar-like CoRoT target HD 170987: spectroscopic and seismic observations
• Models of alpha Centauri A and B with and without seismic constraints: time dependence of the mixing-length parameter
• Seismic analysis of the second ionization region of helium in the Sun: I. Sensitivity study and methodology
• On deriving p-mode parameters for inclined solar-like stars
• A new seismic analysis of Alpha Centauri
• Mode width fitting with a simple bayesian approach. Application to CoRoT targets HD 181420 and HD 49933
• Hydrodynamical simulations of convection-related stellar micro-variability. II. The enigmatic granulation background of the COROT target HD49933

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• Determining stellar macroturbulence using asteroseismic rotational velocities from Kepler
• Asteroseismology of solar-type stars
• Bayesian peak-bagging of solar-like oscillators using MCMC: A comprehensive guide
• Determination of Three-dimensional Spin-orbit Angle with Joint Analysis of Asteroseismology, Transit Lightcurve, and the Rossiter-McLaughlin Effect: Cases of HAT-P-7 and Kepler-25
• What asteroseismology can do for exoplanets: Kepler-410A b is a Small Neptune around a bright star, in an eccentric orbit consistent with low obliquity
• Visibilities and bolometric corrections for stellar oscillation modes observed by Kepler
• Spin-orbit alignment of exoplanet systems: ensemble analysis using asteroseismology
• Asteroseismology from multi-month Kepler photometry: the evolved Sun-like stars KIC 10273246 and KIC 10920273
• Differential rotation in main-sequence solar-like stars: Qualitative inference from asteroseismic data