Journal
ASTRONOMY & ASTROPHYSICS
Volume 640, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202038224
Keywords
asteroseismology; stars: early-type; stars: oscillations; stars: evolution; stars: rotation; stars: fundamental parameters
Categories
Funding
- NASA [NAS5-26555, NNX17AB92G]
- NASA Office of Space Science [NAG5-7584]
- NASA Explorer Program
- Fund for Scientific Research of Flanders (FWO), Belgium
- Research Council of KU Leuven, Belgium
- Fonds National Recherches Scientific (FNRS), Belgium
- Royal Observatory of Belgium
- Observatoire de Geneve, Switzerland
- Thuringer Landessternwarte Tautenburg, Germany
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [670519: MAMSIE]
- Spanish Government Ministerio de Ciencia e Innovacion [PGC-2018-091 3741-B-C22, SEV 2015-0548]
- Canarian Agency for Research, Innovation and Information Society (ACIISI), of the Canary Islands Government
- European Regional Development Fund (ERDF) [ProID2017010115]
- US Department of Energy through the Los Alamos National Laboratory
- National Nuclear Security Administration of US Department of Energy [89233218CNA000001]
- STFC [ST/S000542/1]
- Klaus Tschira Foundation
- NASA [1002294, NNX17AB92G] Funding Source: Federal RePORTER
- STFC [ST/S000542/1] Funding Source: UKRI
Ask authors/readers for more resources
Context. Massive stars are predicted to excite internal gravity waves (IGWs) by turbulent core convection and from turbulent pressure fluctuations in their near-surface layers. These IGWs are extremely efficient at transporting angular momentum and chemical species within stellar interiors, but they remain largely unconstrained observationally.Aims. We aim to characterise the photometric detection of IGWs across a large number of O and early-B stars in the Hertzsprung-Russell diagram, and explain the ubiquitous detection of stochastic variability in the photospheres of massive stars.Methods. We combined high-precision time-series photometry from the NASA Transiting Exoplanet Survey Satellite with high-resolution ground-based spectroscopy of 70 stars with spectral types O and B to probe the relationship between the photometric signatures of IGWs and parameters such as spectroscopic mass, luminosity, and macroturbulence.Results. A relationship is found between the location of a star in the spectroscopic Hertzsprung-Russell diagram and the amplitudes and frequencies of stochastic photometric variability in the light curves of massive stars. Furthermore, the properties of the stochastic variability are statistically correlated with macroturbulent velocity broadening in the spectral lines of massive stars.Conclusions. The common ensemble morphology for the stochastic low-frequency variability detected in space photometry and its relationship to macroturbulence is strong evidence for IGWs in massive stars, since these types of waves are unique in providing the dominant tangential velocity field required to explain the observed spectroscopy.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available