Impact of gaps in the asteroseismic characterization of pulsating stars

  title={Impact of gaps in the asteroseismic characterization of pulsating stars},
  author={Javier Pascual-Granado and Juan Carlos Su'arez and Rafael Garrido and Andr{\'e}s Moya and A. Garc'ia Hern'andez and J. R. Rod'on and M Lares-Martiz},
  journal={Astronomy \& Astrophysics},
Context. It is known that the observed distribution of frequencies in CoRoT and Kepler δ Scuti stars has no parallelism with any theoretical model. Pre-whitening is a widespread technique in the analysis of time series with gaps from pulsating stars located in the classical instability strip, such as δ Scuti stars. However, some studies have pointed out that this technique might introduce biases in the results of the frequency analysis. Aims. This work aims at studying the biases that can… 

Toward a New Paradigm in the Analysis of Asteroseismic Lightcurves

This paper aims at being a provocative guide to the future of asteroseismology from the perspective of the analysis of time series, where the fundamentals of harmonic analysis are subjected to stress

TESS Data for Asteroseismology: Light-curve Systematics Correction

Data from the Transiting Exoplanet Survey Satellite (TESS) have produced of the order of one million light curves at cadences of 120 s and especially 1800 s for every ∼27 day observing sector during

Self-consistent method to extract non-linearities from pulsating star light curves – I. Combination frequencies

Combination frequencies are not solutions of the perturbed stellar structure equations. In dense power spectra from a light curve of a given multi-periodic pulsating star, they can compromise the

Updated pulsation period relations of γ Dor-type stars in eclipsing binaries: the case of KIC 2557430

We employ optical spectroscopy and Kepler photometry to derive the physical properties and pulsational characteristics of the detached system KIC 2557430. We find that the system is formed by

A fractal analysis application of the pre-whitening technique to δ Scuti stars time series

Fractal fingerprints have been found recently in the light curves of several δ Scuti stars observed by Convection Rotation and planetary Transits(CoRoT) satellite. This sole fact might pose a

KIC 12602250: A Low-amplitude Double-mode Delta Scuti Star with Amplitude Modulation

We report a detailed light-curve analysis of the Kepler target Kepler Input Catalog (KIC) 12602250. The results show that KIC 12602250 is a low-amplitude radial double-mode δ-Scuti star with

The potential of Shannon entropy to find the large separation of δ Scuti stars: The entropy spectrum

  • J. Suárez
  • Physics, Computer Science
    Frontiers in Astronomy and Space Sciences
  • 2022
The basic mathematical grounds of the Shannon entropy are described and how it can be applied to échelle diagrams through a new diagnostic diagram: the entropy (H) spectrum (HSpec), which presents several limitations.

A Comprehensive Power Spectral Density Analysis of Astronomical Time Series. I. The Fermi-LAT Gamma-Ray Light Curves of Selected Blazars

We present the results of the Fermi-Large Area Telescope 10 yr long light curve (LC) modeling of selected blazars: six flat-spectrum radio quasars (FSRQs) and five BL Lacertae (BL Lacs), examined in



Impact on asteroseismic analyses of regular gaps in Kepler data

The NASA Kepler mission has observed more than 190,000 stars in the constellations of Cygnus and Lyra. Around 4 years of almost continuous ultra high-precision photometry have been obtained reaching

Measuring mean densities of δ Scuti stars with asteroseismology - Theoretical properties of large separations using TOUCAN

Aims. We study the theoretical properties of the regular spacings found in the oscillation spectra of δ Scuti stars. Methods. We performed a multivariable analysis that covered a wide range of


Stars with spectral types earlier than about F0 on (or close) to the main sequence have long been believed to lack observable surface convection, although evolutionary models of A-type stars do

A comprehensive study of young B stars in NGC 2264 . I. Space photometry and asteroseismology

Context. Space photometric time series of the most massive members of the young open cluster NGC 2264 allow us to study their different sources of variability down to the millimagnitude level and

Semi-empirical seismic relations of A-F stars from COROT and Kepler legacy data

Asteroseismology is witnessing a revolution thanks to high-precise asteroseismic space data (MOST, CoRoT, Kepler, BRITE), and their large ground-based follow-up programs. Those instruments have


We created a large database of physical parameters and variability indicators by fully reducing and analyzing the large number of spectra taken to complement the asteroseismic observations of the

Low-amplitude variations detected by CoRoT in the B8IIIe star HD 175869

Context. The origin of the short-term variability in Be stars remains a matter of controversy. Pulsations and rotational modulation are the components of the favored hypothesis. Aims. We present our

Asteroseismic analysis of the CoRoT \delta-Scuti star HD174936

We present an analysis of the \delta-Scuti star object HD 174936 (ID 7613) observed by CoRoT during the first short run SRc01 (27 days). A total number of 422 frequencies we are extracted from the

Kepler Asteroseismology Program: Introduction and First Results

Asteroseismology involves probing the interiors of stars and quantifying their global properties, such as radius and age, through observations of normal modes of oscillation. The technical

CoRoT sounds the stars: p-mode parameters of Sun-like oscillations on HD 49933

Context. The first asteroseismology results from CoRoT are presented, on a star showing Sun-like oscillations. We have analyzed a 60 day lightcurve of high-quality photometric data collected by CoRoT