V456 Cyg: An eclipsing binary with tidally perturbed g-mode pulsations

Abstract

Context. Many well-known bright stars have been observed by the ongoing Transiting Exoplanet Survey Satellite (TESS) space mission. For several of them, these new data reveal previously unobserved variability, such as tidally perturbed pulsations in close binary stars. Aims. Using newly detected gravity-mode (g-mode) pulsations in V456 Cyg, we aim to determine the global stellar properties of this short-period eclipsing binary and evaluate the interaction between these pulsations and the tides. Methods. We model the binary orbit and determine the physical properties of the component stars using the TESS photometry and published spectroscopy. We then measure the pulsation frequencies from the residuals of the light curve fit using iterative prewhitening, and analyse them to determine the global asteroseismic stellar parameters. We evaluate the pulsation parameters as a function of the orbital phase. Results. We find that the pulsations belong to the secondary component of V456 Cyg and that this star likely has a uniform radial rotation profile, synchronous (${\nu }_{\mathrm{rot}}=1.113(14){\mathrm{d}}^{-1}$) with the binary orbit (${\nu }_{\mathrm{orb}}=1.122091(8){\mathrm{d}}^{-1}$). The observed g modes are amplified by almost a factor three in the stellar hemisphere facing the primary. We present evidence that this is caused by tidal perturbation of the pulsations, with the mode coupling being strongly affected. Conclusions. V456 Cyg is only the second object for which tidally perturbed high-order g-mode pulsations are identified, after ${\pi }^5$ Ori. This opens up new opportunities for tidal g-mode asteroseismology, as it demonstrates another avenue in which g modes and tides can interact with each other.

arXiv comment8 pages, 6 figures, 3 tables. Accepted for publication in Astronomy & Astrophysics on 12 January 2022

References in corpus (73)

• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• The Transiting Exoplanet Survey Satellite
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• Binary interaction dominates the evolution of massive stars
• A Survey of Stellar Families: Multiplicity of Solar-Type Stars
• Accurate masses and radii of normal stars: modern results and applications
• Theoretical isochrones in several photometric systems I. Johnson-Cousins-Glass, HST/WFPC2, HST/NICMOS, Washington, and ESO Imaging Survey filter sets
• Mind your Ps and Qs: the Interrelation between Period (P) and Mass-ratio (Q) Distributions of Binary Stars
• Kepler Mission Design, Realized Photometric Performance, and Early Science
• The CoRoT satellite in flight : description and performance
• The TESS Input Catalog and Candidate Target List
• Nominal values for selected solar and planetary quantities: IAU 2015 Resolution B3
• Eclipsing binaries in open clusters. II. V453 Cyg in NGC 6871
• Homogeneous studies of transiting extrasolar planets. I. Light curve analyses
• Probing the interior physics of stars through asteroseismology
• Limb and gravity-darkening coefficients for the TESS satellite at several metallicities, surface gravities, and microturbulent velocities
• Probing the properties of convective cores through g modes: high-order g modes in SPB and gamma Doradus stars
• Gamma Doradus Stars: Defining a New Class of Pulsating Variables
• BRITE-Constellation: nanosatellites for precision photometry of bright stars
• The interior rotation of a sample of gamma Doradus stars from ensemble modelling of their gravity mode period spacings
• General Cosmography Model with Spatial Curvature
• {\em Gaia}-derived luminosities of {\em Kepler} A/F stars and the pulsator fraction across the δ Scuti instability strip
• Internal mixing of rotating stars inferred from dipole gravity modes
• Eclipsing binaries as standard candles: HD 23642 and the distance to the Pleiades
• Amplitude modulation in $\delta$ Sct stars: statistics from an ensemble study of Kepler targets
• KIC 4544587: an Eccentric, Short Period Binary System with delta Sct Pulsations and Tidally Excited Modes
• Beaming Binaries - a New Observational Category of Photometric Binary Stars
• Heartbeat Stars, Tidally Excited Oscillations, and Resonance Locking
• The solar-type eclipsing binary system LL Aquarii
• Tidal asteroseismology: Kepler's KOI-54
• Forward asteroseismic modeling of stars with a convective core from gravity-mode oscillations: parameter estimation and stellar model selection
• Asteroseismic masses, ages, and core properties of $\gamma$ Doradus stars using gravito-inertial dipole modes and spectroscopy
• Forward seismic modelling of the pulsating magnetic B-type star HD 43317
• KIC 3240411 - the hottest known SPB star with the asymptotic g-mode period spacing
• Rotation of the convective core in $\gamma$ Dor stars measured by dips in period spacings of g modes coupled with inertial modes
• Tidally Trapped Pulsations in a close binary star system discovered by TESS
• Deciphering the oscillation spectrum of $\gamma$ Doradus and SPB stars
• First evidence of inertial modes in $\gamma$ Doradus stars: The core rotation revealed
• Binary Asteroseismic Modelling: isochrone-cloud methodology and application to Kepler gravity-mode pulsators
• Probing the temperature gradient in the core boundary layer of stars with gravito-inertial modes: the case of KIC7760680
• The orbital period -- mass ratio relation of wide sdB+MS binaries and its application to the stability of RLOF
• Discovery of tidally-perturbed pulsations in the eclipsing binary U Gru: a pioneering system for tidal asteroseismology
• An instability due to the nonlinear coupling of p-modes to g-modes: Implications for coalescing neutron star binaries
• 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
• Deriving the orbital properties of pulsators in binary systems through their light arrival time delays
• Variability of newly identified B-type stars observed by Kepler
• Discovery of $\beta$ Cep pulsations in the eclipsing binary V453 Cygni
• An astrophysical interpretation of the remarkable g-mode frequency groups of the rapidly rotating $\gamma$ Dor star, KIC 5608334
• Tidally Trapped Pulsations in Binary Stars
• Tidally Induced Pulsations in Kepler Eclipsing Binary KIC 3230227
• Dynamical resonance locking in tidally interacting binary systems
• Tidal Circularization of Binaries by Resonance Locking I: The Importance of the Pre-Main-Sequence
• Seismic probing of the first dredge-up event through the eccentric red-giant & red-giant spectroscopic binary KIC9163796
• Nonconservative Mass Transfer in Massive Binaries and the Formation of Wolf-Rayet+O Binaries
• Detection of nonlinear resonances among gravity modes of slowly pulsating B stars: results from five iterative prewhitening strategies
• High-precision asteroseismology in Slowly Pulsating B star: HD 50230
• Asteroseismic modeling of gravity modes in slowly rotating A/F stars with radiative levitation
• Dynamical tide in stellar radiative zones. General formalism and evolution for low-mass stars
• 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
• Amplitudes of low frequency modes in rotating B type stars
• The effect of the centrifugal acceleration on period spacings of gravito-inertial modes in intermediate-mass stars
• Overstable Convective Modes in Rotating Early Type Stars
• Mass transfer and tidally tilted pulsation in the Algol-type system TZ Dra
• The traditional approximation of rotation for rapidly rotating stars and planets. I. The impact of strong deformation
• Tidally Perturbed Oblique Pulsations in the Hierarchical Triple System V1031 Orionis
• BRITE-Constellation photometry of $\bpi^5$ Orionis, an ellipsoidal SPB variable
• Study of Eclipsing Binary and Multiple Systems in OB Associations II. The Cygnus OB Region: V443 Cyg, V456 Cyg and V2107 Cyg

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• The ESO UVES/FEROS Large Programs of TESS OB pulsators. I. Global stellar parameters from high-resolution spectroscopy
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