Seismic evidence for a weak radial differential rotation in intermediate-mass core helium burning stars

Abstract

The detection of mixed modes that are split by rotation in Kepler red giants has made it possible to probe the internal rotation profiles of these stars, which brings new constraints on the transport of angular momentum in stars. Mosser et al. (2012) have measured the rotation rates in the central regions of intermediate-mass core helium burning stars (secondary clump stars). Our aim was to exploit& the rotational splittings of mixed modes to estimate the amount of radial differential rotation in the interior of secondary clump stars using Kepler data, in order to place constraints on angular momentum transport in intermediate-mass stars. We selected a subsample of Kepler secondary clump stars with mixed modes that are clearly rotationally split. By applying a thorough statistical analysis, we showed that the splittings of both gravity-dominated modes (trapped in central regions) and p-dominated modes (trapped in the envelope) can be measured. We then used these splittings to estimate the amount of differential rotation by using inversion techniques and by applying a simplified approach based on asymptotic theory (Goupil et al. 2013). We obtained evidence for a weak radial differential rotation for six of the seven targets that were selected, with the central regions rotating $1.8\pm 0.3$ to $3.2\pm 1.0$ times faster than the envelope. The last target was found to be consistent with a solid-body rotation. This demonstrates that an efficient redistribution of angular momentum occurs after the end of the main sequence in the interior of intermediate-mass stars, either during the short-lived subgiant phase, or once He-burning has started in the core. In either case, this should bring constraints on the angular momentum transport mechanisms that are at work.

16 pages, 8 figures, accepted in A&A

References in corpus (13)

• Modules for Experiments in Stellar Astrophysics (MESA)
• Correcting stellar oscillation frequencies for near-surface effects
• The connection between stellar granulation and oscillation as seen by the Kepler mission
• Precise radial velocities of giant stars. III. Spectroscopic stellar parameters
• Asteroseismic measurement of surface-to-core rotation in a main sequence A star, KIC 11145123
• Mixed modes in red giants: a window on stellar evolution
• The Liege Oscillation Code
• Angular Momentum Transport via Internal Gravity Waves in Evolving Stars
• Rotation speed and stellar axis inclination from p modes: How CoRoT would see other suns
• Oscillating K giants with the WIRE satellite: determination of their asteroseismic masses
• The angular momentum transport by unstable toroidal magnetic fields
• Magnetic braking of stellar cores in red giants and supergiants
• Influence of Low-Degree High-Order p-Mode Splittings on the Solar Rotation Profile

Cited by in corpus (117)

• Slowing the Spins of Stellar Cores
• Probing the interior physics of stars through asteroseismology
• Most Black Holes are Born Very Slowly Rotating
• Angular Momentum Transport in Stellar Interiors
• White Dwarf Rotation as a Function of Mass and a Dichotomy of Mode Linewidths: Kepler Observations of 27 Pulsating DA White Dwarfs Through K2 Campaign 8
• Period spacings in red giants II. Automated measurement
• Asteroseismology of solar-type stars
• Giant star seismology
• Rotating models of young solar-type stars : Exploring braking laws and angular momentum transport processes
• Period spacings in red giants I. Disentangling rotation and revealing core structure discontinuities
• Surface rotation of Kepler red giant stars
• On the Differential Rotation of Massive Main Sequence Stars
• Constraining the efficiency of angular momentum transport with asteroseismology of red giants: the effect of stellar mass
• Asteroseismic signatures of evolving internal stellar magnetic fields
• The interior angular momentum of core hydrogen burning stars from gravity-mode oscillations
• Stochastic gravitational-wave background as a tool to investigate multi-channel astrophysical and primordial black-hole mergers
• Dipole modes with depressed amplitudes in red giants are mixed modes
• Angular momentum transport efficiency in post-main sequence low-mass stars
• Period spacings in red giants IV: Toward a complete description of the mixed-mode pattern
• The spins of compact objects born from helium stars in binary systems
• Asteroseismology of evolved stars to constrain the internal transport of angular momentum II. Test of a revised prescription for transport by the Tayler instability
• Seismic evidence for near solid-body rotation in two Kepler subgiants and implications for angular momentum transport
• NuGrid stellar data set - III. Updated low-mass AGB models and s-process nucleosynthesis with metallicities Z=0.01, Z=0.02 and Z=0.03
• A New Method for the Asteroseismic Determination of the Evolutionary State of Red-Giant Stars
• Asteroseismology of evolved stars to constrain the internal transport of angular momentum. I. Efficiency of transport during the subgiant phase
• Anisotropic turbulent transport in stably stratified rotating stellar radiation zones
• Period spacings in red giants; III. Coupling factors of mixed modes
• KIC 10080943: An eccentric binary system containing two pressure- and gravity-mode hybrid pulsators
• The s process in AGB stars as constrained by a large sample of Barium stars
• Period spacings of gravity modes in rapidly rotating magnetic stars I. Axisymmetric fossil field with poloidal and toroidal components
• Angular momentum transport in massive stars and natal neutron star rotation rates
• Internal rotation of 13 low-mass low-luminosity red giants in the Kepler field
• Active red giants: close binaries versus single rapid rotators
• Lithium depletion and angular momentum transport in solar-type stars
• Near-degeneracy effects on the frequencies of rotationally-split mixed modes in red giants
• Kepler sheds new and unprecedented light on the variability of a blue supergiant: gravity waves in the O9.5Iab star HD 188209
• Rotation in stellar interiors: General formulation and an asteroseismic-calibrated transport by the Tayler instability
• Convective core sizes in rotating massive stars: I. Constraints from solar metallicity OB field stars
• Shear mixing in stellar radiative zones - II. Robustness of numerical simulations
• Do meteoritic silicon carbide grains originate from asymptotic giant branch stars of super-solar metallicity?
• Asteroseismology of red giants: from analysing light curves to estimating ages
• Semi-analytic Expressions for the Isolation and Coupling of Mixed Modes
• Probing the progenitors of spinning binary black-hole mergers with long gamma-ray bursts
• Analytical modelling of period spacings across the HR diagram
• Seismic signature of electron degeneracy in the core of red giants: hints for mass transfer between close red-giant companions
• Seismic probing of the first dredge-up event through the eccentric red-giant & red-giant spectroscopic binary KIC9163796
• Tidal Spin-up of Black Hole Progenitor Stars
• Asteroseismic measurement of core and envelope rotation rates for 2006 red giant branch stars
• Asteroseismology of evolved stars to constrain the internal transport of angular momentum. III. Using the rotation rates of intermediate-mass stars to test the Fuller-formalism
• Reliability of stellar inclination estimated from asteroseismology: analytical criteria, mock simulations and Kepler data analysis
• Constraining transport of angular momentum in stars: Combining asteroseismic observations of core helium burning stars and white dwarfs
• Magnetar Powered Ordinary Type IIP Supernovae
• Probing core overshooting using subgiant asteroseismology: the case of KIC10273246
• Stellar Photospheric Abundances as a Probe of Disks and Planets
• Asteroseismology of 19 low-luminosity red giant stars from Kepler
• Latitudinal differential rotation in the solar analogues 16 Cyg A and B
• Asteroseismology of the young open cluster NGC 2516 I: Photometric and spectroscopic observations
• Evidence from K2 for rapid rotation in the descendant of an intermediate-mass star
• Angular momentum transport by magnetic fields in main sequence stars with Gamma Doradus pulsators
• Core-Envelope Coupling in Intermediate-Mass Core-Helium Burning Stars
• Testing Angular Momentum Transport and Wind Loss in Intermediate Mass Core Helium Burning Stars
• The first two-dimensional stellar structure and evolution models of rotating stars
• Fast and Automated Peak Bagging with DIAMONDS (FAMED)
• Gravity mode offset and properties of the evanescent zone in red-giant stars
• Influence of stellar structure, evolution and rotation on the tidal damping of exoplanetary spin-orbit angles
• The s process in rotating low-mass AGB stars. Nucleosynthesis calculations in models matching asteroseismic constraints
• Asteroseismology of evolved stars to constrain the internal transport of angular momentum. IV. Internal rotation of Kepler 56 from an MCMC analysis of the rotational splittings
• Limits on radial differential rotation in Sun-like stars from parametric fits to oscillation power spectra
• Period spacing of gravity modes strongly affected by rotation. Going beyond the traditional approximation
• Deciphering stellar chorus: apollinaire, a Python 3 module for Bayesian peakbagging in helio- and asteroseismology
• Automated approach to measure stellar inclinations: validation through large-scale measurements on the red giant branch
• Testing angular momentum transport processes with asteroseismology of solar-type main-sequence stars
• Asymptotic theory of gravity modes in rotating stars II. Impact of general differential rotation
• Magnetohydrodynamic Simulations of the Tayler Instability in Rotating Stellar Interiors
• The tight subgiant branch of the intermediate-age star cluster NGC 411 implies a single-aged stellar population
• Asteroseismology of evolved stars to constrain the internal transport of angular momentum. V. Efficiency of the transport on the red giant branch and in the red clump
• The traditional approximation of rotation for rapidly rotating stars and planets. II. Deformation and differential rotation
• Asteroseismology of evolved stars to constrain the internal transport of angular momentum. VI. Testing a parametric formulation for the azimuthal magneto-rotational instability
• Backtracing the internal rotation history of the $\beta$ Cep star HD 129929
• Bayesian hierarchical inference of asteroseismic inclination angles
• Tayler-Spruit dynamo in stably stratified rotating fluids: Application to proto-magnetars
• Measuring frequency and period separations in red-giant stars using machine learning
• Unveiling complex magnetic field configurations in red giant stars
• Nonlinear Mixed Modes in Red Giants
• Photometric White Dwarf Rotation
• Do both black holes spin in merging binaries? Evidence from GWTC-4 and astrophysical implications
• Lithium in Kepler Red Giants: Defining Normal and Anomalous
• Improved asteroseismic inversions for red-giant surface rotation rates
• Convective Differential Rotation in Stars and Planets I: Theory
• Seismic characterization of red giants going through the Helium-core flash
• Mode coupling coefficients between the convective core and radiative envelope of $\gamma$Doradus and slowly pulsating B stars
• Revealing the Fate of Exoplanet Systems: Asteroseismic Identification of Host Star in the Red Clump or Red Giant Branch
• Convective Differential Rotation in Stars and Planets II: Observational and Numerical Tests
• Magnetic Webs in Stellar Radiative Zones
• Anisotropic turbulent transport with horizontal shear in stellar radiative zones
• Angular momentum and lithium transport from main sequence to sub-giant and red giant low-mass stars
• In search of gravity mode signatures in main sequence solar-type stars observed by Kepler
• Nonlinear internal waves breaking in stellar radiation zones. Parametrisation for the transport of angular momentum: bridging geophysical to stellar fluid dynamics
• RUBIS: a simple tool for calculating the centrifugal deformation of stars and planets
• The robustness of inferred envelope and core rotation rates of red-giant stars from asteroseismology
• Dynamos and Differential Rotation: Advances at the Crossroads of Analytics, Numerics, and Observations
• Inverse analysis of asteroseismic data: a review
• Constraining the Rotation Profile in a Low-Luminosity Subgiant with a Surface Rotation Measurement
• Constraining differential rotation in gamma Doradus stars from inertial dips properties
• TIC441725813: A new bright hybrid sdB pulsator with differential core/envelope rotation
• Constraining stellar physics from red-giant stars in binaries - stellar rotation, mixing processes and stellar activity
• Asymptotic power spectra and visibilities of damped mixed modes
• The γ Dor stars as revealed by Kepler : A key to reveal deep-layer rotation in A and F stars
• Impact of near-degeneracy effects on linear rotational inversions for red-giant stars
• Probing the internal magnetism of stars using asymptotic magneto-asteroseismology
• Near-critical magnetic fields in Kepler red giants
• Decoding the Future of Exoplanets: Asteroseismic Confirmation of Subgiant and Red Giant Hosts
• Near-degeneracy effects in Quadrupolar Mixed Modes. From an Asymptotic Description to Data Fitting
• Seismic diagnosis from gravity modes strongly affected by rotation
• Stellar dynamics of low mass stars from the surface to the interior measured by CoRoT and Kepler
• Co-existence of Internal Gravity Waves and Tayler-Spruit Magnetic Fields in the Radiative Core of Low-mass Stars
• Detailed theoretical analysis of core Helium-burning stars: Mixed mode patterns I. Impact of the He-flash discontinuity and of induced semi-convection