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On the feasibility of structure inversions for gravity-mode pulsators
Vincent Vanlaer, Conny Aerts, Earl P. Bellinger +1
Gravity-mode asteroseismology has significantly improved our understanding of mixing in intermediate mass stars. However, theoretical pulsation periods of stellar models remain in…
Towards solar measurements of nuclear reaction rates
Earl Patrick Bellinger, Jørgen Christensen-Dalsgaard
Nuclear reaction rates are a fundamental yet uncertain ingredient in stellar evolution models. The astrophysical S-factor pertaining to the initial reaction in the proton-proton ch…
Searching for dark energy with the Sun
Ippocratis D. Saltas, Jørgen Christensen-Dalsgaard
General extensions of General Relativity (GR) based on bona fide degrees of freedom predict a fifth force which operates within massive objects, opening up an exciting opportunity…
PLATO Hare-and-Hounds exercise: Asteroseismic model fitting of main-sequence solar-like pulsators
M. S. Cunha, I. W. Roxburgh, V. Aguirre Børsen-Koch +19
Asteroseismology is a powerful tool to infer fundamental stellar properties. The use of these asteroseismic-inferred properties in a growing number of astrophysical contexts makes…
The BAyesian STellar Algorithm (BASTA): a fitting tool for stellar studies, asteroseismology, exoplanets, and Galactic archaeology
V. Aguirre Børsen-Koch, J. L. Rørsted, A. B. Justesen +16
We introduce the public version of the BAyesian STellar Algorithm (BASTA), an open-source code written in {\tt Python} to determine stellar properties based on a set of astrophysic…
Asteroseismic Inference of the Central Structure in a Subgiant Star
Earl P. Bellinger, Sarbani Basu, Saskia Hekker +2
Asteroseismic measurements enable inferences of the underlying stellar structure, such as the density and the speed of sound at various points within the interior of the star. This…
Solar structure and evolution
Joergen Christensen-Dalsgaard
The Sun provides a critical benchmark for the general study of stellar structure and evolution. Also, knowledge about the internal properties of the Sun is important for the unders…
Asteroseismology of 36 Kepler subgiants -- II: Determining ages from detailed modelling
Tanda Li, Timothy R. Bedding, Jørgen Christensen-Dalsgaard +3
Detailed modelling of stellar oscillations is able to give precise estimates for stellar ages, but the inferred results typically depend on the adopted model parameters used for th…
TESS Asteroseismic Analysis of the Known Exoplanet Host Star HD 222076
Chen Jiang, Timothy R. Bedding, Keivan G. Stassun +24
The Transiting Exoplanet Survey Satellite (TESS) is an all-sky survey mission aiming to search for exoplanets that transit bright stars. The high-quality photometric data of TESS a…
Detection and characterisation of oscillating red giants: first results from the TESS satellite
Víctor Silva Aguirre, Dennis Stello, Amalie Stokholm +78
Since the onset of the `space revolution' of high-precision high-cadence photometry, asteroseismology has been demonstrated as a powerful tool for informing Galactic archaeology in…
Coupling 1D stellar evolution with 3D-hydrodynamical simulations on-the-fly II: Stellar Evolution and Asteroseismic Applications
Jakob Rørsted Mosumgaard, Andreas Christ Sølvsten Jørgensen, Achim Weiss +2
Models of stellar structure and evolution are an indispensable tool in astrophysics, yet they are known to incorrectly reproduce the outer convective layers of stars. In the first…
Testing stellar evolution with asteroseismic inversions of a main sequence star harboring a small convective core
Earl P. Bellinger, Sarbani Basu, Saskia Hekker +1
The goal of stellar evolution theory is to predict the structure of stars throughout their lifetimes. Usually, these predictions can be assessed only indirectly, for example by com…
TESS Asteroseismology of the known red-giant host stars HD 212771 and HD 203949
Tiago L. Campante, Enrico Corsaro, Mikkel N. Lund +45
The Transiting Exoplanet Survey Satellite (TESS) is performing a near all-sky survey for planets that transit bright stars. In addition, its excellent photometric precision enables…
Analytical modelling of period spacings across the HR diagram
M. S. Cunha, P. P. Avelino, J. Christensen-Dalsgaard +4
The characterisation of stellar cores may be accomplished through the modelling of asteroseismic data from stars exhibiting either gravity-mode or mixed-mode pulsations, potentiall…
Asteroseismic constraints on the cosmic-time variation of the gravitational constant from an ancient main-sequence star
Earl Patrick Bellinger, Jørgen Christensen-Dalsgaard
We investigate the variation of the gravitational constant over the history of the Universe by modeling the effects on the evolution and asteroseismology of the low-mass star K…
Solar models with convective overshoot, the solar-wind mass loss, and a PMS disk accretion: helioseismic quantities, Li depletion and neutrino fluxes
Qian-Sheng Zhang, Yan Li, Jørgen Christensen-Dalsgaard
Helioseismic observations have revealed many properties of the Sun: the depth and the helium abundance of the convection zone, the sound-speed and the density profiles in the solar…
Damping rates and frequency corrections of Kepler LEGACY stars
G. Houdek, M. N. Lund, R. Trampedach +3
Linear damping rates and modal frequency corrections of radial oscillation modes in selected LEGACY main-sequence stars are estimated by means of a nonadiabatic stability analysis.…
Oscillations in the Sun with SONG: Setting the scale for asteroseismic investigations
M. Fredslund Andersen, P. Pallé, J. Jessen-Hansen +12
Context. We present the first high-cadence multi-wavelength radial-velocity observations of the Sun-as-a-star, carried out during 57 consecutive days using the stellar échelle spec…
Asteroseismology of the Hyades red giant and planet host epsilon Tauri
Torben Arentoft, Frank Grundahl, Timothy R. White +23
Asteroseismic analysis of solar-like stars allows us to determine physical parameters such as stellar mass, with a higher precision compared to most other methods. Even in a well-s…
The Asteroseismic Target List (ATL) for solar-like oscillators observed in 2-minute cadence with the Transiting Exoplanet Survey Satellite (TESS)
M. Schofield, W. J. Chaplin, D. Huber +21
We present the target list of solar-type stars to be observed in short-cadence (2-min) for asteroseismology by the NASA Transiting Exoplanet Survey Satellite (TESS) during its 2-ye…
Asteroseismic modelling of the subgiant μ Herculis using SONG data: lifting the degeneracy between age and model input parameters
Tanda Li, Timothy R. Bedding, Hans Kjeldsen +3
We model the oscillations of the SONG target Herculis to estimate the parameters of the star. The = 1 mixed modes of Her provide strong constraints on stellar proper…
Butterfly diagram of a Sun-like star observed using asteroseismology
M. Bazot, M. B. Nielsen, D. Mary +6
Stellar magnetic fields are poorly understood but are known to be important for stellar evolution and exoplanet habitability. They drive stellar activity, which is the main observa…
Modelling the solar twin 18 Sco
M. Bazot, O. Creevey, J. Christensen-Dalsgaard +1
Solar twins are objects of great interest in that they allow us to understand better how stellar evolution and structure are affected by variations of the stellar mass, age and che…
Asteroseismic detection of latitudinal differential rotation in 13 Sun-like stars
O. Benomar, M. Bazot, M. B. Nielsen +7
The differentially rotating outer layers of stars are thought to play a role in driving their magnetic activity, but the underlying mechanisms that generate and sustain differentia…