Tidally perturbed g-mode pulsations in a sample of close eclipsing binaries

Abstract

Context. Thanks to the high-precision photometry from space missions such as Kepler and TESS, tidal perturbations and tilting of pulsations have been detected in more than a dozen binary systems. However, only two of these were g-mode pulsators. Aims. We aim to detect tidally perturbed g modes in additional binary systems and characterise them observationally. Methods. We perform a custom data reduction of the available Kepler and TESS photometry of a well-studied sample of 35 binary systems with gamma Doradus pulsators. For each target, we model the binary signal using a sum of 100 sine waves, with frequencies at orbital harmonics, and measure significant pulsation frequencies by iteratively prewhitening the residual light curve. Pulsations are labelled as tidally perturbed g modes if they are part of both period-spacing patterns and orbital-frequency-spaced multiplets. After visual inspection and confirmation, the properties of these targets and g modes are characterised. Results. We detect tidally perturbed g-mode pulsations for five short-period binaries that are circularised and (almost) synchronously rotating: KIC3228863, KIC3341457, KIC4947528, KIC9108579, and KIC12785282. Tidally perturbed g modes that occur within the same star and have the same mode identification (k,m), are found to have near-identical relative amplitude and phase modulations, which are within their respective 1-sigma uncertainties also identical for the Kepler and TESS photometric passbands. By contrast, pulsations with different mode identification (k,m) are found to exhibit different modulations. Moreover, the observed amplitude and phase modulations are correlated, indicating that the binary tides primarily distort g-mode amplitudes on the stellar surface. The phase modulations are then primarily a geometric effect of the integration of the stellar flux over the visible stellar surface. (abbreviated)

21 pages, 33 figures, 2 tables. Accepted for publication in Astronomy and Astrophysics on 17 January 2023

References in corpus (44)

• Array Programming with NumPy
• The Transiting Exoplanet Survey Satellite
• astroquery: An Astronomical Web-Querying Package in Python
• Tertiary companions to close spectroscopic binaries
• Probing the properties of convective cores through g modes: high-order g modes in SPB and gamma Doradus stars
• The interior rotation of a sample of gamma Doradus stars from ensemble modelling of their gravity mode period spacings
• Heartbeat Stars, Tidally Excited Oscillations, and Resonance Locking
• A new asteroseismic diagnostic for internal rotation in $\gamma$ Doradus stars
• A detection threshold in the amplitude spectra calculated from Kepler data obtained during K2 mission
• Finding binaries among Kepler pulsating stars from phase modulation of their pulsations
• Detecting non-uniform period spacings in the Kepler photometry of gamma Doradus stars: methodology and case studies
• Rotation of the convective core in $\gamma$ Dor stars measured by dips in period spacings of g modes coupled with inertial modes
• First evidence of inertial modes in $\gamma$ Doradus stars: The core rotation revealed
• Magnetic OB[A] Stars with TESS: probing their Evolutionary and Rotational properties (MOBSTER) - I. First-light observations of known magnetic B and A stars
• Period spacings of gravity modes in rapidly rotating magnetic stars I. Axisymmetric fossil field with poloidal and toroidal components
• The single-sided pulsator CO~Camelopardalis
• Asteroseismic inference of the near-core magnetic field strength in the main sequence B star HD 43317
• KIC 8164262: a Heartbeat Star Showing Tidally Induced Pulsations with Resonant Locking
• The effect of tides on near-core rotation: analysis of 35 Kepler $\gamma$ Doradus stars in eclipsing and spectroscopic binaries
• Discovery of $\beta$ Cep pulsations in the eclipsing binary V453 Cygni
• Variability of newly identified B-type stars observed by Kepler
• Tidally Trapped Pulsations in Binary Stars
• The Eclipsing System V404 Lyr: Light-Travel Times and Gamma Doradus Pulsations
• Detecting axisymmetric magnetic fields using gravity modes in intermediate-mass stars
• Two-Dimensional Simulations of Internal Gravity Waves in The Radiation Zones of Intermediate-Mass Stars
• Periodic variable A-F spectral type stars in the northern TESS continuous viewing zone
• A beta Cephei pulsator and a changing orbital inclination in the high-mass eclipsing binary system VV Orionis
• A comparison of the dynamical and model-derived parameters of the pulsating eclipsing binary KIC9850387
• Tidally perturbed pulsations in the pre-main sequence $\delta$ Scuti binary RS Cha
• Rotating Convective Core Excites Non-Radial Pulsations to Cause Rotational Modulations in Early-Type Stars
• Seismic modeling of a very young SPB star -- KIC8264293
• The effect of the centrifugal acceleration on period spacings of gravito-inertial modes in intermediate-mass stars
• Detecting deep axisymmetric toroidal magnetic fields in stars. The traditional approximation of rotation for differentially rotating deep spherical shells with a general azimuthal magnetic field
• Inverse Tides in Pulsating Binary Stars
• Mass transfer and tidally tilted pulsation in the Algol-type system TZ Dra
• Tidally Tilted Pulsations in HD 265435, a subdwarf B Star with a Close White Dwarf Companion
• Asteroseismology of the dip structure in period-spacings of rapidly rotating gamma Doradus stars caused by the coupling between core and envelope oscillations
• Absolute Properties of the Eclipsing $\gamma$ Dor Star V404 Lyrae
• BRITE-Constellation photometry of $\bpi^5$ Orionis, an ellipsoidal SPB variable
• Tidal perturbations and eclipse mapping in the pulsations in the hierarchical triple system U~Gru
• V456 Cyg: An eclipsing binary with tidally perturbed g-mode pulsations
• The near-core rotation of HD 112429: a gamma Doradus star with TESS photometry and legacy spectroscopy
• A binary with a $\delta$~Scuti star and an oscillating red giant: orbit and asteroseismology of KIC9773821
• Stellar rotation rates in Kepler eccentric (heartbeat) binaries obtained from r-mode signatures

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