Exploring the internal rotation of the extremely low-mass He-core white dwarf GD 278 with TESS asteroseismology

Abstract

(Abridged) We present an exploration of the internal rotation of GD 278, the first pulsating extremely low-mass white dwarf that shows rotational splittings within its periodogram. We assess the theoretical frequency splittings expected for different rotation profiles and compare them to the observed frequency splittings of GD 278. To this aim, we employ an asteroseismological model representative of the pulsations of this star, obtained by using the LPCODE stellar evolution code. We also derive a rotation profile that results from detailed evolutionary calculations carried out with the MESA stellar evolution code and use it to infer the expected theoretical frequency splittings. We found that the best-fitting solution when assuming linear profiles for the rotation of GD 278 leads to values of the angular velocity at the surface and the center that are only slightly differential, and still compatible with rigid rotation. The values of the angular velocity at the surface and the center for the simple linear rotation profiles and for the rotation profile derived from evolutionary calculations are in very good agreement. Also, the resulting theoretical frequency splittings are compatible with the observed frequency splittings, in general, for both cases. The results obtained from the different approaches followed in this work to derive the internal rotation of GD 278 agree. The fact that they were obtained employing two independent stellar evolution codes gives robustness to our results. Our results suggest only a marginally differential behavior for the internal rotation in GD 278, and considering the uncertainties involved, very compatible with the rigid case, as has been observed previously for white dwarfs and pre-white dwarfs. The rotation periods derived for this star are also in line with the values determined asteroseismologically for white dwarfs and pre-white dwarfs in general.

arXiv comment9 pages, 6 figures. Accepted for publication in Astronomy & Astrophysics

References in corpus (75)

• 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
• 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
• The K2 Mission: Characterization and Early results
• Presupernova Evolution of Rotating Massive Stars I: Numerical Method and Evolution of the Internal Stellar Structure
• Dynamo action by differential rotation in a stably stratified stellar interior
• Presupernova Evolution of Differentially Rotating Massive Stars Including Magnetic Fields
• A $Gaia$ Data Release 2 catalogue of white dwarfs and a comparison with SDSS
• Evolutionary and pulsational properties of white dwarf stars
• Seismic evidence for a rapidly rotating core in a lower-giant-branch star observed with Kepler
• Pulsating White Dwarf Stars and Precision Asteroseismology
• Probing the interior physics of stars through asteroseismology
• Angular momentum transport within evolved low-mass stars
• New evolutionary sequences for extremely low mass white dwarfs: Homogeneous mass and age determinations, and asteroseismic prospects
• The formation and evolution of hydrogen-deficient post-AGB white dwarfs: the emerging chemical profile and the expectations for the PG1159-DB-DQ evolutionary connection
• Asteroseismic measurement of surface-to-core rotation in a main sequence A star, KIC 11145123
• The ELM Survey. I. A Complete Sample of Extremely Low Mass White Dwarfs
• Pulsating white dwarfs: new insights
• Models of low-mass helium white dwarfs including gravitational settling, thermal and chemical diffusion, and rotational mixing
• High-resolution UVES/VLT spectra of white dwarfs observed for the ESO SN Ia Progenitor Survey. III. DA white dwarfs
• Toward ensemble asteroseismology of ZZ Ceti stars with fully evolutionary models
• The ELM Survey. II. Twelve Binary White Dwarf Merger Systems
• Diffusion and the occurrence of hydrogen shell flashes in helium white dwarf stars
• The ELM Survey. VII. Orbital Properties of Low Mass White Dwarf Binaries
• Asteroseismic inferences on GW Vir variable stars in the frame of new PG 1159 evolutionary models
• The ELM Survey. VIII. 98 Double White Dwarf Binaries
• White dwarf evolutionary sequences for low-metallicity progenitors: The impact of third dredge-up
• Multi-periodic pulsations of a stripped red giant star in an eclipsing binary
• SDSS J184037.78+642312.3: The First Pulsating Extremely Low Mass White Dwarf
• Formation of Extremely Low-mass White Dwarfs in Double Degenerates
• A new class of pulsating white dwarf of extremely low mass: the fourth and fifth members
• The ELM Survey. VI. Eleven New Double Degenerates
• Prospects for Measuring Differential Rotation in White Dwarfs Through Asteroseismology
• Discovery of pulsations, including possible pressure modes, in two new extremely low mass, He-core white dwarfs
• WASP 1628+10 - an EL CVn-type binary with a very-low-mass stripped-red-giant star and multi-periodic pulsations
• A Refined Search for Pulsations in White Dwarf Companions to Millisecond Pulsars
• Asteroseismological measurements on PG 1159-035, the prototype of the GW Vir variable stars
• Evolution and colors of helium-core white dwarf stars with high-metallicity progenitors
• Formation of Extremely Low-mass White Dwarfs Binaries
• Dynamical Tides in Compact White Dwarf Binaries: Influence of Rotation
• A deep test of radial differential rotation in a helium-atmosphere white dwarf: I. Discovery of pulsations in PG 0112+104
• The potential of asteroseismology for probing the core chemical stratification in white dwarf stars
• The ELM Survey. IX. A Complete Sample of Low Mass White Dwarf Binaries in the SDSS Footprint
• Asteroseismological constraints on the pulsating planetary nebula nucleus (PG1159-type) RX J2117.1+3412
• Pulsating low-mass white dwarfs in the frame of new evolutionary sequences: III. The pre-ELM white dwarf instability strip
• Asteroseismological constraints on the coolest GW Vir variable star (PG 1159-type)PG 0122+200
• TESS first look at evolved compact pulsators: asteroseismology of the pulsating helium-atmosphere white dwarf TIC 257459955
• Asteroseismology of the Kepler V777 Her variable white dwarf with fully evolutionary models
• Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: I. Asteroseismology of the GW Vir stars RX J2117+3412, HS 2324+3944, NGC 6905, NGC 1501, NGC 2371, and K 1-16
• Discovery of Three Pulsating, Mixed-atmosphere, Extremely Low-mass White Dwarf Precursors
• The sdA problem - II. Photometric and Spectroscopic Follow-up
• The ELM Survey South. I. An Effective Search for Extremely Low Mass White Dwarfs
• Asteroseismology of hot pre-white dwarf stars: the case of the DOV stars PG 2131+066 and PG 1707+427, and the PNNV star NGC 1501
• SDSS J074511.56+194926.5: Discovery of a Metal-Rich and Tidally Distorted Extremely Low Mass White Dwarf
• Pulsating low-mass white dwarfs in the frame of new evolutionary sequences: II. Nonadiabatic analysis
• Heavy metals in a light white dwarf: Abundances of the metal-rich, extremely low-mass GALEX J1717+6757
• Asteroseismic test of rotational mixing in low-mass white dwarfs
• Tidal Interactions in Post Common-Envelope sdB Binaries
• Probing the internal rotation of pre-white dwarf stars with asteroseismology: the case of PG 122+200
• The coolest extremely low-mass white dwarfs
• Revealing the pulsational properties of the V777 Her star KUV 05134+2605 by its long-term monitoring
• On the possible existence of short-period g-mode instabilities powered by nuclear burning shells in post-AGB H-deficient (PG1159-type) stars
• Pulsating low-mass white dwarfs in the frame of new evolutionary sequences VI. Thin H-envelope sequences and asteroseismology of ELMV stars revisited
• Pulsating low-mass white dwarfs in the frame of new evolutionary sequences: V. Asteroseismology of ELMV white dwarf stars
• The McDonald Observatory search for pulsating sdA stars: asteroseismic support for multiple populations
• Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with {\it TESS}: III. Asteroseismology of the DBV star GD 358
• The asteroseismic potential of CHEOPS
• Discovery, TESS Characterization, and Modeling of Pulsations in the Extremely Low Mass White Dwarf GD 278
• Asteroseismology of the GW Virginis stars SDSS J0349-0059 and VV 47
• Convection physics and tidal synchronization of the subdwarf binary NY Virginis
• Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS -- IV. Discovery of two new GW Vir stars: TIC0403800675 and TIC1989122424

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