Tidally trapped pulsations in a close binary star system discovered by TESS

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dc.authoridSowicka, Paulina/0000-0002-6605-0268
dc.authoridJones, David/0000-0003-3947-5946
dc.authoridChowdhury, Sowgata/0000-0001-7444-5131
dc.authoridJacobs, Thomas/0000-0003-3988-3245
dc.authoridGagliano, Robert/0000-0002-5665-1879
dc.authoridHandler, Gerald/0000-0001-7756-1568
dc.authoridVanderburg, Andrew/0000-0001-7246-5438
dc.contributor.authorHandler, G.
dc.contributor.authorKurtz, D. W.
dc.contributor.authorRappaport, S. A.
dc.contributor.authorSaio, H.
dc.contributor.authorFuller, J.
dc.contributor.authorJones, D.
dc.contributor.authorGuo, Z.
dc.date.accessioned2025-01-27T20:52:01Z
dc.date.available2025-01-27T20:52:01Z
dc.date.issued2020
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractIt 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 delta 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. HD 74423 is an unusual binary star system containing two lambda Bootis pulsators. TESS photometry reveals that one of the pair is pulsating along its tidal axis-but only in one hemisphere. Such an odd arrangement provides an interesting laboratory in which to study stellar pulsations and tidal distortion.
dc.description.sponsorshipDanish National Research Foundation [DNRF106]; ESA PRODEX [PEA 4000119301]; Stellar Astrophysics Centre (SAC) at Aarhus University; STFC [ST/M000877/1]; Australian Government Research Training Program (RTP) Scholarship; Polish NCN grant [2015/18/A/ST9/00578]; State Research Agency (AEI) of the Spanish Ministry of Science, Innovation and Universities (MCIU); European Regional Development Fund (FEDER) [AYA2017-83383-P]; TASC/TASOC; NASA Explorer Program; [MNiSW DIR/WK/2016/07]; STFC [ST/M000877/1] Funding Source: UKRI
dc.description.sponsorshipThis paper includes data collected by the TESS mission. Funding for the TESS mission is provided by the NASA Explorer Program. Funding for the TESS Asteroseismic Science Operations Centre is provided by the Danish National Research Foundation (grant agreement DNRF106), ESA PRODEX (PEA 4000119301) and Stellar Astrophysics Centre (SAC) at Aarhus University. Some of the observations reported in this paper were obtained with the Southern African Large Telescope (SALT). Polish participation in SALT is funded by grant MNiSW DIR/WK/2016/07. D.W.K. acknowledges financial support from the STFC via grant ST/M000877/1. M.S. is supported by an Australian Government Research Training Program (RTP) Scholarship. G.H., S.C., F.K.A. and P.S. acknowledge financial support by the Polish NCN grant 2015/18/A/ST9/00578. D.J. acknowledges support from the State Research Agency (AEI) of the Spanish Ministry of Science, Innovation and Universities (MCIU) and the European Regional Development Fund (FEDER) under grant AYA2017-83383-P. We thank the TESS team and staff and TASC/TASOC for their support of the present work and Allan R. Schmitt for making his light-curve examining software LcTools freely available. S.C. is grateful to C. Engelbrecht for introducing him to the use of the observing equipment. G.H. thanks E. Paunzen for helpful discussions on the spectra of. Bootis stars. A.V. is a NASA Sagan Fellow.
dc.identifier.doi10.1038/s41550-020-1035-1
dc.identifier.endpage689
dc.identifier.issn2397-3366
dc.identifier.issue7
dc.identifier.scopus2-s2.0-85081741443
dc.identifier.scopusqualityQ1
dc.identifier.startpage684
dc.identifier.urihttps://doi.org/10.1038/s41550-020-1035-1
dc.identifier.urihttps://hdl.handle.net/20.500.12428/25625
dc.identifier.volume4
dc.identifier.wosWOS:000518736500004
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherNature Publishing Group
dc.relation.ispartofNature Astronomy
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectP-Mode
dc.subjectAlgorithm
dc.subjectSearch
dc.titleTidally trapped pulsations in a close binary star system discovered by TESS
dc.typeArticle

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