Publications (41)
Four bright eclipsing binaries with gamma Doradus pulsating components: CM Lac, MZ Lac, RX Dra and V2077 Cyg
John Southworth, Timothy Van Reeth
The study of pulsating stars in eclipsing binaries holds the promise of combining two different ways of measuring the physical properties of a star to obtain improved constraints o…
Asteroseismic modeling of gravity modes in slowly rotating A/F stars with radiative levitation
Joey S. G. Mombarg, Aaron Dotter, Timothy Van Reeth +3
It has been known for several decades that transport of chemical elements is induced by the process of microscopic atomic diffusion. Yet, the effect of atomic diffusion, including…
Gravity-mode period spacings and near-core rotation rates of 611 Doradus stars with \textit{Kepler}
Gang Li, Timothy Van Reeth, Timothy R. Bedding +4
We report our survey of \,Doradus stars from the 4-yr \textit{Kepler} mission. These stars pulsate mainly in g modes and r modes, showing period-spacing patterns in the amplitu…
Unresolved Rossby and gravity modes in 214 A and F stars showing rotational modulation
Andreea I. Henriksen, Victoria Antoci, Hideyuki Saio +9
Here we report an ensemble study of 214 A- and F-type stars observed by \textit{Kepler}, exhibiting the so-called \textit{hump and spike} periodic signal, explained by Rossby modes…
Asteroseismic inference of the near-core magnetic field strength in the main sequence B star HD 43317
Daniel Lecoanet, Dominic M. Bowman, Timothy Van Reeth
About 10 per cent of intermediate- and high-mass dwarf stars are observed to host a strong large-scale magnetic field at their surface, which is thought to be of fossil field origi…
Asteroseismic masses, ages, and core properties of Doradus stars using gravito-inertial dipole modes and spectroscopy
Joey S. G. Mombarg, Timothy Van Reeth, May G. Pedersen +5
The asteroseismic modelling of period spacing patterns from gravito-inertial modes in stars with a convective core is a high-dimensional problem. We utilise the measured period spa…
KIC 4150611: A quadruply eclipsing heptuple star system with a g-mode period-spacing pattern Asteroseismic modelling of the g-mode period-spacing pattern
Alex Kemp, Dario J Fritzewski, Timothy Van Reeth +7
In this work, we aim to estimate the stellar parameters of the primary (Aa) by performing asteroseismic analysis on its period-spacing pattern. We use the C-3PO neural network to p…
Probing the physics in the core boundary layers of the double-lined B-type binary KIC4930889 from its gravito-inertial modes
Mathias Michielsen, Timothy Van Reeth, Andrew Tkachenko +1
Stellar evolution models of B-type stars are still uncertain in terms of internal mixing properties, notably in the area between the convective core and the radiative envelope. Thi…
Period spacings of Doradus pulsators in the \textit{Kepler} field: Rossby and gravity modes in 82 stars
Gang Li, Timothy Van Reeth, Timothy R. Bedding +2
Rossby modes are the oscillations in a rotating fluid, whose restoring force is the Coriolis force. They provide an additional diagnostic to understand the rotation of stars, which…
The period-luminosity relation for delta Scuti stars using Gaia DR2 parallaxes
Elham Ziaali, Timothy R. Bedding, Simon J. Murphy +2
We have examined the period-luminosity (P-L) relation for delta Scuti stars using Gaia DR2 parallaxes. We included 228 stars from the catalogue of Rodriguez et al. (2000), as well…
Spinning up the Surface: Evidence for Planetary Engulfment or Unexpected Angular Momentum Transport?
Jamie Tayar, Facundo D. Moyano, Melinda Soares-Furtado +15
In this paper, we report the potential detection of a nonmonotonic radial rotation profile in a low-mass lower-luminosity giant star. For most low- and intermediate-mass stars, the…
Isochrone-cloud fitting and asteroseismology of the Kepler open cluster NGC6866
Haotian Wang, Gang Li, Dario J. Fritzewski +2
We investigate how isochrones computed with different input physics and initial conditions affect the age dating of the open cluster NGC 6866, and compare the results with asterose…
Estimates of (convective core) masses, radii, and relative ages for 14,000 Gaia-discovered gravity-mode pulsators monitored by TESS
Joey S. G. Mombarg, Conny Aerts, Timothy Van Reeth +1
Gravito-inertial asteroseismology saw its birth from the 4-years long light curves of rotating main-sequence stars assembled by the Kepler space telescope. High-precision measureme…
Photometric detection of internal gravity waves in upper main-sequence stars. IV. Comparable stochastic low-frequency variability in SMC, LMC, and Galactic massive stars
Dominic M. Bowman, Pieterjan Van Daele, Mathias Michielsen +1
Massive main-sequence stars have convective cores and radiative envelopes, but also sub-surface convection zones caused by partial ionisation. However, the convective properties de…
TESS Data for Asteroseismology: Light Curve Systematics Correction
Mikkel N. Lund, Rasmus Handberg, Derek L. Buzasi +7
Data from the Transiting Exoplanet Survey Satellite (TESS) has produced of order one million light curves at cadences of 120 s and especially 1800 s for every ~27-day observing sec…
Analysis of high-resolution FEROS spectroscopy for a sample of variable B-type stars assembled from TESS photometry
Sarah Gebruers, Andrew Tkachenko, Dominic M. Bowman +8
Spectroscopic data are necessary to break degeneracies in asteroseismic modelling of the interior structure in high- and intermediate-mass stars. We derive precise photospheric ste…
The ESO UVES/FEROS Large Programs of TESS OB pulsators. I. Global stellar parameters from high-resolution spectroscopy
Nadya Serebriakova, Andrew Tkachenko, Sarah Gebruers +7
Modern stellar structure and evolution theory experiences a lack of observational calibrations for the interior physics of intermediate- and high-mass stars. This leads to discrepa…
A homogeneous spectroscopic analysis of a Kepler legacy sample of dwarfs for gravity-mode asteroseismology
Sarah Gebruers, Ilya Straumit, Andrew Tkachenko +12
Asteroseismic modelling of the internal structure of main-sequence stars born with a convective core has so far been based on homogeneous analyses of space photometric Kepler light…
Rotation of the convective core in Dor stars measured by dips in period spacings of g modes coupled with inertial modes
Hideyuki Saio, Masao Takata, Umin Lee +2
The relation of period spacing () versus period () of dipole prograde g modes is known to be useful to measure rotation rates in the g-mode cavity of rapidly rotating …
Constraining the near-core rotation of the gamma Doradus star 43 Cygni using BRITE-Constellation data
Konstanze Zwintz, Timothy Van Reeth, Andrew Tkachenko +8
Photometric time series of the Dor star 43 Cyg obtained with the BRITE-Constellation nano-satellites allow us to study its pulsational properties in detail and to constrain it…
Internal rotation and buoyancy travel time of 60 gamma Doradus stars from uninterrupted TESS light curves spanning 352 days
Stefano Garcia, Timothy Van Reeth, Joris De Ridder +1
Context. Gamma Doradus (hereafter ~Dor) stars are gravity-mode pulsators whose periods carry information about the internal structure of the star. These periods are especially…
The PLATO Mission
Heike Rauer, Conny Aerts, Juan Cabrera +842
PLATO (PLAnetary Transits and Oscillations of stars) is ESA's M3 mission designed to detect and characterise extrasolar planets and perform asteroseismic monitoring of a large numb…
The Nature of Unseen Companions in Massive Single-Line Spectroscopic Binaries
Hugues Sana, Michael Abdul-Masih, Gareth Banyard +14
Massive stars are predominantly found in binaries and higher order multiples. While the period and eccentricity distributions of OB stars are now well established across different…
Predictions for gravity-mode periods and surface abundances in intermediate-mass dwarfs from shear mixing and radiative levitation
Joey S. G. Mombarg, Aaron Dotter, Michel Rieutord +3
The treatment of chemical mixing in the radiative envelopes of intermediate-mass stars has hardly been calibrated so far. Recent asteroseismic studies demonstrated that a constant…
Evolution of the near-core rotation frequency of 2,497 intermediate-mass stars from their dominant gravito-inertial mode
Conny Aerts, Timothy Van Reeth, Joey S. G. Mombarg +1
We combined Gaia DR3 and TESS photometric light curves to estimate the internal physical properties of 2,497 gravity-mode pulsators. We relied on asteroseismic properties of Kepler…
Physical properties of the eclipsing binary KIC 9851944 and analysis of its tidally-perturbed p- and g-mode pulsations
Zachary Jennings, John Southworth, Kresimir Pavlovski +1
Stars that are both pulsating and eclipsing offer an important opportunity to better understand many of the physical phenomena that occur in stars, because it is possible to measur…
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
Hachem Dhouib, Stéphane Mathis, Lisa Bugnet +2
Asteroseismology has revealed small core-to-surface rotation contrasts in stars in the whole HR diagram. This is the signature of strong transport of angular momentum (AM) in stell…
Detecting axisymmetric magnetic fields using gravity modes in intermediate-mass stars
Jordan Van Beeck, Vincent Prat, Timothy Van Reeth +4
Context: Angular momentum (AM) transport models of stellar interiors require improvements to explain the strong extraction of AM from stellar cores that is observed with asteroseis…
{\em Gaia}-derived luminosities of {\em Kepler} A/F stars and the pulsator fraction across the δ Scuti instability strip
Simon J. Murphy, Daniel Hey, Timothy Van Reeth +1
We study the fraction of stars in and around the δ Scuti instability strip that are pulsating, using {\em Gaia} DR2 parallaxes to derive precise luminosities. We classify a sample…
The traditional approximation of rotation for rapidly rotating stars and planets. I. The impact of strong deformation
Hachem Dhouib, Vincent Prat, Timothy Van Reeth +1
The Traditional Approximation of Rotation (TAR) is a treatment of the hydrodynamic equations of rotating and stably stratified fluids in which the action of the Coriolis accelerati…
Asteroseismology of the young open cluster NGC 2516 I: Photometric and spectroscopic observations
Gang Li, Conny Aerts, Timothy R. Bedding +8
Asteroseismic modelling of isolated star presents significant challenges due to the difficulty in accurately determining stellar parameters, particularly the stellar age. These cha…
Period spacings of Doradus pulsators in the Kepler field: detection methods and application to 22 slow rotators
Gang Li, Timothy R. Bedding, Simon J. Murphy +3
In Doradus stars, the g-mode period spacing shows an approximately linear relation with period. The slope is a new asteroseismic diagnostic, related to the rotation rate and t…
The traditional approximation of rotation for rapidly rotating stars and planets. II. Deformation and differential rotation
Hachem Dhouib, Vincent Prat, Timothy Van Reeth +1
We examine the dynamics of low-frequency gravito-inertial waves (GIWs) in differentially rotating deformed radiation zones in stars and planets by generalising the traditional appr…
Classifying Kepler light curves for 12,000 A and F stars using supervised feature-based machine learning
Nicholas H. Barbara, Timothy R. Bedding, Ben D. Fulcher +2
With the availability of large-scale surveys like Kepler and TESS, there is a pressing need for automated methods to classify light curves according to known classes of variable st…
The effect of the centrifugal acceleration on period spacings of gravito-inertial modes in intermediate-mass stars
Jan Henneco, Timothy Van Reeth, Vincent Prat +3
The Kepler and TESS missions delivered high-precision, long-duration photometric time series for hundreds of main-sequence stars with gravito-inertial (g) pulsation modes. This hig…
Detection of nonlinear resonances among gravity modes of slowly pulsating B stars: results from five iterative prewhitening strategies
Jordan Van Beeck, Dominic M. Bowman, May G. Pedersen +3
Context. Slowly pulsating B (SPB) stars are main-sequence multi-periodic oscillators that display non-radial gravity modes. For a fraction of these pulsators, 4-year photometric li…
An all-sky sample of intermediate- to high-mass OBA-type eclipsing binaries observed by TESS
Luc W. IJspeert, Andrew Tkachenko, Cole Johnston +4
Context. Intermediate- to high-mass stars are the least numerous types of stars and they are less well understood than their more numerous low-mass counterparts in terms of their i…
Astro2020 Science White Paper: gravity-wave asteroseismology of intermediate- and high-mass stars
Andrew Tkachenko, Conny Aerts, Dominic M. Bowman +17
The evolution of a star is driven by the physical processes in its interior making the theory of stellar structure and evolution the most crucial ingredient for not only stellar ev…
Can we detect deep axisymmetric toroidal magnetic fields in stars?
Hachem Dhouib, Stéphane Mathis, Lisa Bugnet +2
One of the major discoveries of asteroseismology is the signature of a strong extraction of angular momentum (AM) in the radiative zones of stars across the entire Hertzsprung-Russ…
Tidal perturbations and eclipse mapping in the pulsations in the hierarchical triple system U~Gru
Cole Johnston, Andrew Tkachenko, Timothy Van Reeth +4
Context. Unambiguous examples of the influence of tides on self-excited, free stellar pulsations have recently been observationally detected in space-based photometric data. Aims.…
Constraining stellar evolution theory with asteroseismology of Doradus stars using deep learning
Joey S. G. Mombarg, Timothy Van Reeth, Conny Aerts
The efficiency of the transport of angular momentum and chemical elements inside intermediate-mass stars lacks proper calibration, thereby introducing uncertainties on a star's evo…