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dc.contributor.authorHodžić, Vedad Kunovac
dc.contributor.authorTriaud, Amaury H. M. J.
dc.contributor.authorMartin, David V.
dc.contributor.authorFabrycky, Daniel C.
dc.contributor.authorCegla, Heather M.
dc.contributor.authorCameron, Andrew Collier
dc.contributor.authorGill, Samuel
dc.contributor.authorHellier, Coel
dc.contributor.authorKostov, Veselin B.
dc.contributor.authorMaxted, Pierre F. L.
dc.contributor.authorOrosz, Jerome A.
dc.contributor.authorPepe, Francesco
dc.contributor.authorPollacco, Don
dc.contributor.authorQueloz, Didier
dc.contributor.authorSégransan, Damien
dc.contributor.authorWelsh, William F.
dc.contributor.authorUdry, Stéphane
dc.identifier.citationHodžić , V K , Triaud , A H M J , Martin , D V , Fabrycky , D C , Cegla , H M , Cameron , A C , Gill , S , Hellier , C , Kostov , V B , Maxted , P F L , Orosz , J A , Pepe , F , Pollacco , D , Queloz , D , Ségransan , D , Welsh , W F & Udry , S 2020 , ' The EBLM project. VII. Spin-orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A ' , Monthly Notices of the Royal Astronomical Society , vol. 497 , no. 2 , pp. 1627–1633 .
dc.identifier.otherPURE: 269527856
dc.identifier.otherPURE UUID: fda9af5e-c165-4c29-a40c-b7bb4a230656
dc.identifier.otherBibCode: 2020MNRAS.tmp.2179H
dc.identifier.otherORCID: /0000-0002-8863-7828/work/78891464
dc.identifier.otherWOS: 000574924500027
dc.identifier.otherScopus: 85094906068
dc.descriptionFunding: This work was inpart funded by the U.S.–Norway Fulbright Foundation and a NASATESSGI grant G022253 (PI: Martin). AHMJT received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant 803193/BEBOP), and from a Leverhulme Trust Research Project grant (RPG-2018-418). VKH is also supported by a Birmingham Doctoral Scholarship, and by a studentship from Birmingham’s School of Physics & Astronomy. DVM received funding from the Swiss National Science Foundation (grant P 400P2 186735). SG has been supported by STFC through consolidated grants ST/L000733/1and ST/P000495/1.en
dc.description.abstractA dozen short-period detached binaries are known to host transiting circumbinary planets. In all circumbinary systems so far, the planetary and binary orbits are aligned within a couple of degrees. However, the obliquity of the primary star, which is an important tracer of their formation, evolution, and tidal history, has only been measured in one circumbinary system until now. EBLM J0608-59/TOI-1338 is a low-mass eclipsing binary system with a recently discovered circumbinary planet identified by TESS. Here, we perform high-resolution spectroscopy during primary eclipse to measure the projected stellar obliquity of the primary component. The obliquity is low, and thus the primary star is aligned with the binary and planetary orbits with a projected spin-orbit angle β = 2.°8 ± 17.°1. The rotation period of18.1 ± 1.6 d implied by our measurement of vsinI⋆ suggests that the primary has not yet pseudo-synchronized with the binary orbit, but is consistent with gyrochronology and weak tidal interaction with the binary companion. Our result, combined with the known coplanarity of the binary and planet orbits, is suggestive of formation from a single disc. Finally, we considered whether the spectrum of the faint secondary star could affect our measurements. We show through simulations that the effect is negligible for our system, but can lead to strong biases in vsinI⋆ and β for higher flux ratios. We encourage future studies in eclipse spectroscopy test the assumption of a dark secondary for flux ratios ≳1ppt.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.rightsCopyright © 2020 the Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectBinaries: eclipsingen
dc.subjectPlanets and satellites: formationen
dc.subjectStars: rotationen
dc.subjectStars: individual (EBLM J0608-59en
dc.subjectStars: low-massen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleThe EBLM project. VII. Spin-orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 Aen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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