Rappaport, SA, Kurtz, DW, Handler, G, Jones, D, Nelson, LA, Saio, H, Fuller, J, Holdsworth, DL, Vanderburg, A, Žák, J, Skarka, M, Aiken, J, Maxted, PFL, Stevens, DJ, Feliz, DL and Aliçavuş, FK (2021) A tidally tilted sectoral dipole pulsation mode in the eclipsing binary TIC 63328020. Monthly Notices of the Royal Astronomical Society, 503 (1). pp. 254-269. ISSN 0035-8711

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We report the discovery of the third tidally tilted pulsator, TIC 63328020. Observations with the TESS satellite reveal binary eclipses with an orbital period of 1.1057 d, and δ Scuti-type pulsations with a mode frequency of 21.09533 d−1. This pulsation exhibits a septuplet of orbital sidelobes as well as a harmonic quintuplet. Using the oblique pulsator model, the primary oscillation is identified as a sectoral dipole mode with l = 1, |m| = 1. We find the pulsating star to have M1 ≃ 2.5 M⊙, R1 ≃ 3 R⊙, and Teff, 1 ≃ 8000 K, while the secondary has M2 ≃ 1.1 M⊙, R2 ≃ 2 R⊙, and Teff, 2 ≃ 5600 K. Both stars appear to be close to filling their respective Roche lobes. The properties of this binary as well as the tidally tilted pulsations differ from the previous two tidally tilted pulsators, HD74423 and CO Cam, in important ways. We also study the prior history of this system with binary evolution models and conclude that extensive mass transfer has occurred from the current secondary to the primary.

Item Type: Article
Additional Information: The final version of this article and all relevant information related to it can be found online at; https://academic.oup.com/mnras/article-abstract/503/1/254/6131847?redirectedFrom=fulltext
Uncontrolled Keywords: binaries: general; stars: individual: TIC 63328020; stars: oscillations
Subjects: Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB799 Stars
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 26 May 2021 07:25
Last Modified: 04 Jun 2021 14:28
URI: https://eprints.keele.ac.uk/id/eprint/9639

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