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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Tidally trapped pulsations in a close binary star system discovered by TESS
Nature Astronomy, Volume 4, No. 7, Year 2020
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Description
It has long been suspected that tidal forces in close binary stars could modify the orientation of the pulsation axis of the constituent stars. Such stars have been searched for, but until now never detected. Here we report the discovery of tidally trapped pulsations in the ellipsoidal variable HD 74423 in Transiting Exoplanet Survey Satellite (TESS) space photometry data. The system contains a δ Scuti pulsator in a 1.6 d orbit, whose pulsation mode amplitude is strongly modulated at the orbital frequency, which can be explained if the pulsations have a much larger amplitude in one hemisphere of the star. We interpret this as an obliquely pulsating distorted dipole oscillation with a pulsation axis aligned with the tidal axis. This is the first time that oblique pulsation along a tidal axis has been recognized. It is unclear whether the pulsations are trapped in the hemisphere directed towards the companion or in the side facing away from it, but future spectral measurements can provide the solution. In the meantime, the single-sided pulsator HD 74423 stands out as the prototype of a new class of obliquely pulsating stars in which the interactions of stellar pulsations and tidal distortion can be studied. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
Authors & Co-Authors
Handler, Gerald
Poland, Warszawa
Polish Academy of Sciences
Kurtz, Donald W.
United Kingdom, Preston
University of Central Lancashire
Rappaport, Saul A.
United States, Cambridge
Massachusetts Institute of Technology
Saio, Hideyuki
Japan, Sendai
Tohoku University
Fuller, Jim
United States, Pasadena
California Institute of Technology
Jones, David
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Guo, Zhao
United States, University Park
Pennsylvania State University
Chowdhury, Sowgata
Poland, Warszawa
Polish Academy of Sciences
Sowicka, Paulina
Poland, Warszawa
Polish Academy of Sciences
Aliçavuş, Filiz Kahraman
Poland, Warszawa
Polish Academy of Sciences
Turkey, Canakkale
Çanakkale Onsekiz Mart Üniversitesi
Murphy, Simon J.
Australia, Sydney
The University of Sydney
Gagliano, Robert
United States, New Haven
Yale University
Jacobs, Thomas Lee
Unknown Affiliation
Vanderburg, Andrew M.
United States, Austin
The University of Texas at Austin
Statistics
Citations: 39
Authors: 14
Affiliations: 13
Identifiers
Doi:
10.1038/s41550-020-1035-1
ISSN:
23973366
Study Design
Cross Sectional Study
Study Approach
Quantitative