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The EBLM project. VII. Spin-orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A

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The EBLM project. VII. Spin-orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A. / Hodžić, Vedad Kunovac; Triaud, Amaury H. M. J.; Martin, David V.; Fabrycky, Daniel C.; Cegla, Heather M.; Cameron, Andrew Collier; Gill, Samuel; Hellier, Coel; Kostov, Veselin B.; Maxted, Pierre F. L.; Orosz, Jerome A.; Pepe, Francesco; Pollacco, Don; Queloz, Didier; Ségransan, Damien; Welsh, William F.; Udry, Stéphane.

In: Monthly Notices of the Royal Astronomical Society, Vol. 497, No. 2, 09.2020, p. 1627–1633.

Research output: Contribution to journalArticle

Harvard

Hodžić, VK, Triaud, AHMJ, Martin, DV, Fabrycky, DC, Cegla, HM, Cameron, AC, Gill, S, Hellier, C, Kostov, VB, Maxted, PFL, Orosz, JA, Pepe, F, Pollacco, D, Queloz, D, Ségransan, D, Welsh, WF & 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. https://doi.org/10.1093/mnras/staa2071

APA

Hodžić, 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, 497(2), 1627–1633. https://doi.org/10.1093/mnras/staa2071

Vancouver

Hodžić VK, Triaud AHMJ, Martin DV, Fabrycky DC, Cegla HM, Cameron AC et al. 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. 2020 Sep;497(2):1627–1633. https://doi.org/10.1093/mnras/staa2071

Author

Hodžić, Vedad Kunovac ; Triaud, Amaury H. M. J. ; Martin, David V. ; Fabrycky, Daniel C. ; Cegla, Heather M. ; Cameron, Andrew Collier ; Gill, Samuel ; Hellier, Coel ; Kostov, Veselin B. ; Maxted, Pierre F. L. ; Orosz, Jerome A. ; Pepe, Francesco ; Pollacco, Don ; Queloz, Didier ; Ségransan, Damien ; Welsh, William F. ; Udry, Stéphane. / The EBLM project. VII. Spin-orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A. In: Monthly Notices of the Royal Astronomical Society. 2020 ; Vol. 497, No. 2. pp. 1627–1633.

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@article{fda9af5ec1654c29a40cb7bb4a230656,
title = "The EBLM project. VII. Spin-orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A",
abstract = "A 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.",
keywords = "Binaries: eclipsing, Planets and satellites: formation, Stars: rotation, Stars: individual (EBLM J0608-59, TOI-1338), Stars: low-mass",
author = "Hod{\v z}i{\'c}, {Vedad Kunovac} and Triaud, {Amaury H. M. J.} and Martin, {David V.} and Fabrycky, {Daniel C.} and Cegla, {Heather M.} and Cameron, {Andrew Collier} and Samuel Gill and Coel Hellier and Kostov, {Veselin B.} and Maxted, {Pierre F. L.} and Orosz, {Jerome A.} and Francesco Pepe and Don Pollacco and Didier Queloz and Damien S{\'e}gransan and Welsh, {William F.} and St{\'e}phane Udry",
note = "Funding: 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{\textquoteright}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{\textquoteright}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.",
year = "2020",
month = sep,
doi = "10.1093/mnras/staa2071",
language = "English",
volume = "497",
pages = "1627–1633",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "OXFORD UNIV PRESS",
number = "2",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - The EBLM project. VII. Spin-orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A

AU - Hodžić, Vedad Kunovac

AU - Triaud, Amaury H. M. J.

AU - Martin, David V.

AU - Fabrycky, Daniel C.

AU - Cegla, Heather M.

AU - Cameron, Andrew Collier

AU - Gill, Samuel

AU - Hellier, Coel

AU - Kostov, Veselin B.

AU - Maxted, Pierre F. L.

AU - Orosz, Jerome A.

AU - Pepe, Francesco

AU - Pollacco, Don

AU - Queloz, Didier

AU - Ségransan, Damien

AU - Welsh, William F.

AU - Udry, Stéphane

N1 - Funding: 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.

PY - 2020/9

Y1 - 2020/9

N2 - A 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.

AB - A 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.

KW - Binaries: eclipsing

KW - Planets and satellites: formation

KW - Stars: rotation

KW - Stars: individual (EBLM J0608-59

KW - TOI-1338)

KW - Stars: low-mass

U2 - 10.1093/mnras/staa2071

DO - 10.1093/mnras/staa2071

M3 - Article

VL - 497

SP - 1627

EP - 1633

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -

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