Discovery of Tidally Perturbed Pulsations in the Eclipsing Binary U Gru: A Crucial System for Tidal Asteroseismology

Discovery of Tidally Perturbed Pulsations in the Eclipsing Binary U Gru: A Crucial System for Tidal Asteroseismology

The interior physics of stars is currently not well constrained for early-type stars. This is particularly pertinent for multiple systems, as binary interaction becomes more prevalent for more massive stars, which strongly affects their evolution. High-precision photometry from the Transiting Exopla...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2019-09, Vol.883 (1), p.L26
Main Authors: Bowman, Dominic M., Johnston, Cole, Tkachenko, Andrew, Mkrtichian, David E., Gunsriwiwat, Khemsinan, Aerts, Conny
Format: Article
Language:eng
Subjects:
asteroseismology
Binary stars
Deposition
Extrasolar planets
Light curve
Massive stars
Planet detection
stars: evolution
stars: individual (U Gru)
stars: massive
stars: oscillations
stars: rotation
Stellar evolution
Stellar seismology
Stellar structure
Transit
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Summary:The interior physics of stars is currently not well constrained for early-type stars. This is particularly pertinent for multiple systems, as binary interaction becomes more prevalent for more massive stars, which strongly affects their evolution. High-precision photometry from the Transiting Exoplanet Survey Satellite (TESS) mission offers the opportunity to remedy the dearth of observations of pulsating stars that show evidence of binary interaction, specifically pulsating mass-accreting components of semi-detached Algol-type eclipsing binary (oEA) systems. We present the TESS light curve of the circular eclipsing binary system U Gru (TIC 147201138), which shows evidence of free heat-driven pressure modes and a series of tidally perturbed pressure modes. We highlight the asteroseismic potential of studying pulsating stars in binary systems, and demonstrate how tidal asteroseismology can be applied to infer the influence of binary interaction on stellar structure.
ISSN:2041-8205
2041-8213