Internal rotation and buoyancy travel time of 60 gamma Doradus stars from uninterrupted TESS light curves spanning 352 days

Abstract

Context. Gamma Doradus (hereafter $\gamma$~Dor) stars are gravity-mode pulsators whose periods carry information about the internal structure of the star. These periods are especially sensitive to the internal rotation and chemical mixing, two processes that are currently not well constrained in the theory of stellar evolution. Aims. We aim to identify the pulsation modes and deduce the internal rotation and buoyancy travel time for 106 $\gamma$ Dor stars observed by the Transiting Exoplanet Survey Satellite (TESS) mission in its southern continuous viewing zone (hereafter S-CVZ). We rely on 140 previously detected period-spacing patterns, that is, series of (near-)consecutive pulsation mode periods. Methods. We used the asymptotic expression to compute gravity-mode frequencies for ranges of the rotation rate and buoyancy travel time that cover the physical range in $\gamma$~Dor stars. Those frequencies were fitted to the observed period-spacing patterns by minimising a custom cost function. The effects of rotation were evaluated using the traditional approximation of rotation, using the stellar pulsation code GYRE. Results. We obtained the pulsation mode identification, internal rotation and buoyancy travel time for 60 TESS $\gamma$~Dor stars. For the remaining 46 targets, the detected patterns are either too short or contained too many missing modes for unambiguous mode identification, and longer light curves are required. For the successfully analysed stars, we found that period-spacing patterns from 1-yr long TESS light curves can constrain the internal rotation and buoyancy travel time to a precision of $0.03{\mathrm{d}}^{-1}$ and 400s, respectively, which is about half as precise as literature results based on 4-yr Kepler light curves of $\gamma$~Dor stars.

16 pages, 21 figures, 5 tables. Accepted for publication in Astronomy and Astrophysics

References in corpus (35)

• The Transiting Exoplanet Survey Satellite
• The GALAH+ Survey: Third Data Release
• Probing the properties of convective cores through g modes: high-order g modes in SPB and gamma Doradus stars
• Asteroseismic measurement of surface-to-core rotation in a main sequence A star, KIC 11145123
• The interior rotation of a sample of gamma Doradus stars from ensemble modelling of their gravity mode period spacings
• Angular momentum transport by heat-driven g-modes in slowly pulsating B stars
• Asteroseismology of solar-type stars
• Asteroseismic measurement of slow, nearly-uniform surface-to-core rotation in the main sequence F star KIC 9244992
• Internal mixing of rotating stars inferred from dipole gravity modes
• Heartbeat Stars, Tidally Excited Oscillations, and Resonance Locking
• The TESS-HERMES survey Data Release 1: high-resolution spectroscopy of the TESS southern continuous viewing zone
• A new asteroseismic diagnostic for internal rotation in $\gamma$ Doradus stars
• Spectroscopic survey of Kepler stars. I. HERMES/Mercator observations of A- and F-type stars
• Asteroseismic masses, ages, and core properties of $\gamma$ Doradus stars using gravito-inertial dipole modes and spectroscopy
• A spectroscopic study of southern (candidate) gamma Doradus stars. II. Detailed abundance analysis and fundamental parameters
• Detecting non-uniform period spacings in the Kepler photometry of gamma Doradus stars: methodology and case studies
• The Contour Method: a new approach to finding modes of non-adiabatic stellar pulsations
• Asteroseismology of evolved stars to constrain the internal transport of angular momentum II. Test of a revised prescription for transport by the Tayler instability
• Rotation of the convective core in $\gamma$ Dor stars measured by dips in period spacings of g modes coupled with inertial modes
• On the use of the Fourier Transform to determine the projected rotational velocity of line-profile variable B stars
• Constraining stellar evolution theory with asteroseismology of $\gamma$ Doradus stars using deep learning
• Probing the temperature gradient in the core boundary layer of stars with gravito-inertial modes: the case of KIC7760680
• Period spacings of gravity modes in rapidly rotating magnetic stars I. Axisymmetric fossil field with poloidal and toroidal components
• Variability of newly identified B-type stars observed by Kepler
• Detecting axisymmetric magnetic fields using gravity modes in intermediate-mass stars
• Period spacings of gravity modes in rapidly rotating magnetic stars II. The case of an oblique dipolar fossil magnetic field
• Asteroseismic modeling of gravity modes in slowly rotating A/F stars with radiative levitation
• Detection of period-spacing patterns due to the gravity modes of rotating dwarfs in the TESS southern continuous viewing zone
• A homogeneous spectroscopic analysis of a Kepler legacy sample of dwarfs for gravity-mode asteroseismology
• Predictions for gravity-mode periods and surface abundances in intermediate-mass dwarfs from shear mixing and radiative levitation
• 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
• The traditional approximation of rotation for rapidly rotating stars and planets. I. The impact of strong deformation
• The traditional approximation of rotation for rapidly rotating stars and planets. II. Deformation and differential rotation

Cited by in corpus (11)

• Confronting sparse Gaia DR3 photometry with TESS for a sample of around 60,000 OBAF-type pulsators
• Asteroseismology of the young open cluster NGC 2516 I: Photometric and spectroscopic observations
• Angular momentum transport by magnetic fields in main sequence stars with Gamma Doradus pulsators
• Age-dating the young open cluster UBC 1 with g-mode asteroseismology, gyrochronology, and isochrone fitting
• The ESO UVES/FEROS Large Programs of TESS OB pulsators. I. Global stellar parameters from high-resolution spectroscopy
• Semi-Analytical Expression of G-Mode Period Spacing: The Case of Brunt-Väisälä Frequency with Not a Jump But a Ramp
• Mode coupling coefficients between the convective core and radiative envelope of $\gamma$Doradus and slowly pulsating B stars
• Gaia/GSP-spec spectroscopic properties of gamma Doradus pulsators
• Probing stellar rotation in the Pleiades with gravity-mode pulsators
• Constraining differential rotation in gamma Doradus stars from inertial dips properties
• Properties of observable mixed inertial and gravito-inertial modes in γ Doradus stars