TIC 308396022: a $\delta$ Scuti--$\gamma$ Doradus hybrid with large-amplitude radial fundamental mode and regular g-mode period spacing

Abstract

We analyse the pulsating behaviour of TIC 308396022 observed by the TESS mission. The star is a high-amplitude $\delta$ Sct star (HADS) that shows a very rich amplitude spectrum using the 3-yr light curve. Among these frequencies, the strongest peak of $f_1=13.20362567(12){\mathrm{d}}^{-1}$ is identified as the radial fundamental mode, and we also find the first and second overtones ($f_2$ and $f_3$). In the low frequency range (< 2.5 ${\mathrm{d}}^{-1}$), 22 peaks are identified to be gravity modes, which show a regular period spacing of about 2460\,s and have the angular degree $l=1$. The period spacing pattern does not show a significant downward trend, suggesting the star rotates slowly. We note that this is a $\delta$ Sct--$\gamma$ Dor hybrid star containing a high-amplitude radial fundamental mode and a regular g-mode period spacing pattern. With O-C analysis, we find the star shows a significant time delay, implying that the star has a companion which is likely to be a white dwarf. The history of possible mass transfer provides a great opportunity to test the current theories of binary evolution, mass transfer, and pulsation.

arXiv commentAccepted by A&A

References in corpus (71)

• Modules for Experiments in Stellar Astrophysics (MESA)
• The Transiting Exoplanet Survey Satellite
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
• Evolution of binary stars and the effect of tides on binary populations
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
• Comprehensive analytic formulae for stellar evolution as a function of mass and metallicity
• Common Envelope Evolution: Where we stand and how we can move forward
• The TESS Input Catalog and Candidate Target List
• Asteroseismology of Solar-Type and Red-Giant Stars
• GYRE: An open-source stellar oscillation code based on a new Magnus Multiple Shooting Scheme
• Evolutionary and pulsational properties of white dwarf stars
• The Kepler characterization of the variability among A- and F-type stars. I. General overview
• Probing the interior physics of stars through asteroseismology
• 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
• Asteroseismic measurement of surface-to-core rotation in a main sequence A star, KIC 11145123
• Hybrid gamma Doradus - delta Scuti pulsators: New insights into the physics of the oscillations from Kepler observations
• The interior rotation of a sample of gamma Doradus stars from ensemble modelling of their gravity mode period spacings
• Pulsating white dwarfs: new insights
• Tight asteroseismic constraints on core overshooting and diffusive mixing in the slowly rotating pulsating B8.3V star KIC 10526294
• Asteroseismic measurement of slow, nearly-uniform surface-to-core rotation in the main sequence F star KIC 9244992
• Kepler Eclipsing Binary Stars. IV. Precise Eclipse Times for Close Binaries and Identification of Candidate Three-Body Systems
• 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
• FM stars: A Fourier view of pulsating binary stars, a new technique for measuring radial velocities photometrically
• On the relationship between the Delta Scuti and Gamma Doradus pulsators
• A new asteroseismic diagnostic for internal rotation in $\gamma$ Doradus stars
• Characterising the observational properties of δ Sct stars in the era of space photometry from the Kepler mission
• Fundamental parameters and infrared excesses of Tycho-Gaia stars
• Turbulent convection and pulsation stability of stars - II. Theoretical instability strip for $\delta$ Scuti and $\gamma$ Doradus stars
• The first view of $\delta$ Scuti and $\gamma$ Doradus stars with the TESS mission
• Very regular high-frequency pulsation modes in young intermediate-mass stars
• Finding binaries from phase modulation of pulsating stars with Kepler: V. Orbital parameters, with eccentricity and mass-ratio distributions of 341 new binaries
• Asteroseismic modelling of the two F-type hybrid pulsators KIC10080943A and KIC10080943B
• Finding binaries among Kepler pulsating stars from phase modulation of their pulsations
• The role of turbulent pressure as a coherent pulsational driving mechanism: the case of the delta Scuti star HD 187547
• Results of a Search for gamma Dor and delta Sct Stars with the Kepler Spacecraft
• High frequency A-type pulsators discovered using SuperWASP
• Period spacings of $\gamma$ Doradus pulsators in the \textit{Kepler} field: Rossby and gravity modes in 82 stars
• Rotation of the convective core in $\gamma$ Dor stars measured by dips in period spacings of g modes coupled with inertial modes
• The period-luminosity relation for delta Scuti stars using Gaia DR2 parallaxes
• Gravity-mode period spacings and near-core rotation rates of 611 $\gamma$ Doradus stars with \textit{Kepler}
• Period spacings of $\gamma$ Doradus pulsators in the Kepler field: detection methods and application to 22 slow rotators
• First evidence of inertial modes in $\gamma$ Doradus stars: The core rotation revealed
• The double-mode nature of the HADS star GSC 00144-03031 and the Petersen diagram of the class
• Confirmation of simultaneous p and g mode excitation in HD 8801 and Gamma Peg from time-resolved multicolour photometry of six candidate "hybrid" pulsators
• Monitoring a high--amplitude Delta Sct star for 152 days: discovery of 12 additional modes and modulation effects in the light curve of CoRoT 101155310
• Deriving the orbital properties of pulsators in binary systems through their light arrival time delays
• On the first $\delta$ Sct--roAp hybrid pulsator and the stability of p and g modes in chemically peculiar A/F stars
• High-precision asteroseismology in Slowly Pulsating B star: HD 50230
• Asteroseismic Fingerprints of Stellar Mergers
• KIC5950759: a high-amplitude $\delta$ Sct star with amplitude and frequency modulation near the terminal age main sequence
• A comparison of the dynamical and model-derived parameters of the pulsating eclipsing binary KIC9850387
• Finding binaries from phase modulation of pulsating stars with Kepler. IV. Detection limits and radial velocity verification
• IAU 2015 Resolution B2 on Recommended Zero Points for the Absolute and Apparent Bolometric Magnitude Scales
• Asteroseismology
• The first high-amplitude delta Scuti star in an eclipsing binary system
• On the Common Envelope Efficiency
• Echelle diagrams and period spacings of g modes in gamma Doradus stars from four years of Kepler observations
• Asteroseismology of hybrid $\delta$ Scuti--$\gamma$ Doradus pulsating stars
• A Weak Modulation Effect Detected in the Light Curves of KIC 5950759: Intrinsic or Instrumental Effect?
• Delta Scuti Variables
• The eclipsing binary systems with $\delta$ Scuti component. I. KIC 10661783
• Forward modeling the orbits of companions to pulsating stars from their light travel time variations
• A double-modulation effect detected in a double-mode high-amplitude $\delta$ Scuti star: KIC 10284901
• A new C-D-like diagram for SPB stars: The variations of period spacing as a signature of evolutionary status
• Multi-site photometric campaign on the high amplitude δ Scuti star KIC 6382916
• Pulsations and Period Variations of the $\delta$ Scuti Star AN Lyncis in a possible three-body system

Cited by in corpus (7)

• Frequency analysis of KIC 1573174 : shedding light on the nature of HADS stars
• Pulsation Analysis of High-Amplitude $\delta$ Scuti Stars with TESS
• Physical properties of the eclipsing binary KIC 9851944 and analysis of its tidally-perturbed p- and g-mode pulsations
• Uncorrelated Amplitude and Frequency Variations of the Harmonics in SX Phoenicis Star XX Cygni
• Exploring the convective core of the high-amplitude $\delta$ Scuti star TIC 120857354 with asteroseismology
• KIC 7914906: An Eclipsing Heartbeat Star with Tidally Excited Oscillations and Gamma Doradus/Delta Scuti Hybrid Pulsations
• KIC 3868420: A high-amplitude $\delta$ Scuti-$\gamma$ Dor hybrid star crossing the Hertzsprung gap