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

S. A. Rappaport, D. W. Kurtz, G. Handler, D. Jones, L. A. Nelson, H. Saio, J. Fuller, D. L. Holdsworth, A. Vanderburg, J. Zák, M. Skarka, J. Aiken, P. F.L. Maxted, D. J. Stevens, D. L. Feliz, F. Kahraman Aliçavuş

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


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 δScuti-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 M 1 ≃ 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.

Original languageEnglish (US)
Pages (from-to)254-269
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - May 1 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.


  • binaries: general
  • stars: individual: TIC 63328020
  • stars: oscillations


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