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Tango of celestial dancers: A sample of detached eclipsing binary systems containing g-mode pulsating components. A case study of KIC9850387

Sekaran, S. and Tkachenko, A. and Abdul-Masih, M. and Prša, A. and Johnston, C. and Huber, D. and Murphy, S. J. and Banyard, G. and Howard, A. W. and Isaacson, H. and Bowman, D. M. and Aerts, C. (2020) Tango of celestial dancers: A sample of detached eclipsing binary systems containing g-mode pulsating components. A case study of KIC9850387. Astronomy and Astrophysics, 643 . Art. No. A162. ISSN 0004-6361.

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Context. Eclipsing binary systems with components that pulsate in gravity modes (g modes) allow for simultaneous and independent constraints of the chemical mixing profiles of stars. The high precision of the dynamical masses and radii as well as the imposition of identical initial chemical compositions and equivalent ages provide strong constraints during the modelling of g-mode period-spacing patterns. Aims. We aim to assemble a sample of g-mode pulsators in detached eclipsing binaries with the purpose of finding good candidates for future evolutionary and asteroseismic modelling. In addition, we present a case study of the eclipsing binary KIC9850387, identified as our most promising candidate, and detail the results of the observational spectroscopic, photometric, and asteroseismic analysis of the system. Methods. We selected all of the detached eclipsing binaries in the Kepler eclipsing binary catalogue with Kepler Input Catalogue (KIC) temperatures between 6000 K and 10 000 K, and performed a visual inspection to determine the presence and density of g modes, and the presence of g-mode period-spacing patterns in their frequency spectra. We then characterised our sample based on their g-mode pulsational parameters and binary and atmospheric parameters. A spectroscopic follow-up of our most promising candidate was then performed, and the orbital elements of the system were extracted. We then performed spectral disentangling followed by atmospheric modelling and abundance analysis for the primary star. We utilised an iterative approach to simultaneously optimise the pulsational and eclipse models, and subsequently performed an analysis of the pressure- (p-) and g-mode pulsational frequencies. Results. We compiled a sample of 93 Kepler eclipsing binary stars with g-mode pulsating components and identified clear g-mode period-spacing patterns in the frequency spectra of seven of these systems. We also identified 11 systems that contained hybrid p- and g-mode pulsators. We found that the g-mode pulsational parameters and the binary and atmospheric parameters of our sample are weakly correlated at best, as expected for detached main-sequence binaries. We find that the eclipsing binary KIC9850387 is a double-lined spectroscopic binary in a near-circular orbit with a hybrid p- and g-mode pulsating primary with M_p = 1.66_(−0.01)^(+0.01) M⊙ and R_p = 2.154_(−0.004)^(+0.002) R⊙, and a solar-like secondary with M_s = 1.062_(−0.005)^(+0.003) M⊙ and R_s = 1.081_(−0.002)^(+0.003) R⊙. We find ℓ = 1 and ℓ = 2 period-spacing patterns in the frequency spectrum of KIC9850387 spanning more than ten radial orders each, which will allow for stringent constraints of stellar structure during future asteroseismic modelling.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Prša, A.0000-0002-1913-0281
Johnston, C.0000-0002-3054-4135
Huber, D.0000-0001-8832-4488
Murphy, S. J.0000-0002-5648-3107
Howard, A. W.0000-0001-8638-0320
Isaacson, H.0000-0002-0531-1073
Aerts, C.0000-0003-1822-7126
Additional Information:© 2020 ESO. Article published by EDP Sciences. Received 21 July 2020; Accepted 28 September 2020; Published online 19 November 2020. The authors would like to thank the anonymous referee who helped us improve the presentation of our results. The research leading to these results has received funding from the Fonds Wetenschappelijk Onderzoek – Vlaanderen (FWO) under the grant agreements G0H5416N (ERC Opvangproject) and G0A2917N (BlackGEM), and from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 670519: MAMSIE). MA acknowledges support from the FWO-Odysseus program under project G0F8H6N. DH acknowledges support from the Alfred P. Sloan Foundation and the National Aeronautics and Space Administration (80NSSC19K0597). The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawai’ian community. We are most fortunate to have the opportunity to conduct observations from this mountain. The authors would also like to thank the Leuven MAMSIE team for useful discussions.
Group:Astronomy Department
Funding AgencyGrant Number
Fonds Wetenschappelijk Onderzoek (FWO)G0H5416N
Fonds Wetenschappelijk Onderzoek (FWO)G0A2917N
European Research Council670519
Fonds Wetenschappelijk Onderzoek (FWO)G0F8H6N
Alfred P. Sloan FoundationUNSPECIFIED
Subject Keywords:binaries: eclipsing – binaries: spectroscopic – stars: fundamental parameters – stars: oscillations – stars: individual: KIC9850387 – asteroseismology
Record Number:CaltechAUTHORS:20201120-093458644
Persistent URL:
Official Citation:Tango of celestial dancers: A sample of detached eclipsing binary systems containing g-mode pulsating components - A case study of KIC9850387. S. Sekaran, A. Tkachenko, M. Abdul-Masih, A. Prša, C. Johnston, D. Huber, S. J. Murphy, G. Banyard, A. W. Howard, H. Isaacson, D. M. Bowman and C. Aerts. A&A, 643 (2020) A162; DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106754
Deposited By: Tony Diaz
Deposited On:20 Nov 2020 17:53
Last Modified:20 Nov 2020 17:53

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