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2023RNAAS...7....2S - Research Notes of the AAS, 7, 2 (2023/January-0)

20 s Cadence TESS Photometry of HR 8799.

SEPULVEDA A.G., HUBER D., LI G., BEDDING T.R., ZHANG Z. and LIU M.C.

Abstract (from CDS):

We analyzed 20 s cadence Transiting Exoplanet Survey Satellite time-series photometry of the exoplanet host star HR 8799 collected in Sector 56. The amplitude spectrum shows Gamma Doradus (γ Dor) pulsations consistent with previous space-based photometry from MOST. Assuming that HR 8799 is a representative of γ Dor stars in the Kepler sample, the dominant dipole mode at 1.98 cycles day–1 implies a core rotation period of ∼0.7 day, which combined with $v\sin i$ and stellar radius measurements would result in a preliminary stellar inclination of ∼28° assuming rigid rotation. We find no significant residual photometric variation after removing the pulsation signal aside from a ∼9 days trend that is likely a systematic effect or an artifact from performing aggressive frequency subtraction in the presence of red noise.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanet systems - Gamma Doradus variable stars - Planet hosting stars - Stellar pulsations - Variable stars

Simbad objects: 2

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