A tidally tilted sectoral dipole pulsation mode in the eclipsing binary TIC 63328020

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Authors	RAPPAPORT S. A. KURTZ D. W. HANDLER G. JONES D. NELSON L. A. SAIO H. FULLER J. HOLDSWORTH D. L. VANDERBURG A. ŽÁK Jiří SKARKA Marek AIKEN J. MAXTED P. F. L. STEVENS D. J. FELIZ D. L. ALICAVU F. K.
Year of publication	2021
Type	Article in Periodical
Magazine / Source	Monthly Notices of the Royal Astronomical Society
MU Faculty or unit	Faculty of Science
Citation
web	https://doi.org/10.1093/mnras/stab336
Doi	http://dx.doi.org/10.1093/mnras/stab336
Keywords	binaries: general; stars: individual: TIC 63328020; stars: oscillations
Description	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 ? 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?2.5M??, R1?3R??, and Teff, 1 ? 8000 K, while the secondary has M2?1.1M??, R2?2R??, 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.
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